text: /*
   * vrrp.c - vrrp plugin action functions
   *
   * Copyright 2019-2020 Rubicon Communications, LLC (Netgate)
   *
   * SPDX-License-Identifier: Apache-2.0
   *
   */
  
  #include <vnet/vnet.h>
  #include <vnet/plugin/plugin.h>
  #include <vnet/mfib/mfib_entry.h>
  #include <vnet/mfib/mfib_table.h>
  #include <vnet/adj/adj.h>
  #include <vnet/adj/adj_mcast.h>
  #include <vnet/fib/fib_table.h>
  #include <vnet/fib/fib_sas.h>
  #include <vnet/ip/igmp_packet.h>
  #include <vnet/ip/ip6_link.h>
  #include <vnet/ethernet/arp_packet.h>
  
  #include <vrrp/vrrp.h>
  #include <vrrp/vrrp_packet.h>
  
  #include <vpp/app/version.h>
  
  static const u8 vrrp4_dst_mac[6] = { 0x1, 0x0, 0x5e, 0x0, 0x0, 0x12 };
  static const u8 vrrp6_dst_mac[6] = { 0x33, 0x33, 0x0, 0x0, 0x0, 0x12 };
  static const u8 vrrp_src_mac_prefix[4] = { 0x0, 0x0, 0x5e, 0x0 };
  
  static int
  vrrp_adv_l2_build_multicast (vrrp_vr_t * vr, vlib_buffer_t * b)
  {
    vnet_main_t *vnm = vnet_get_main ();
    vnet_link_t link_type;
    ethernet_header_t *eth;
    int n_bytes = 0;
    const void *dst_mac;
    u8 mac_byte_ipver;
    u8 *rewrite;
  
    eth = vlib_buffer_get_current (b);
  
    if (vrrp_vr_is_ipv6 (vr))
      {
        dst_mac = vrrp6_dst_mac;
        link_type = VNET_LINK_IP6;
        mac_byte_ipver = 0x2;
      }
    else
      {
        dst_mac = vrrp4_dst_mac;
        link_type = VNET_LINK_IP4;
        mac_byte_ipver = 0x1;
      }
  
    rewrite = ethernet_build_rewrite (vnm, vr->config.sw_if_index, link_type,
  				    dst_mac);
    clib_memcpy (eth, rewrite, vec_len (rewrite));
  
    /* change the source mac from the HW addr to the VRRP virtual MAC */
    clib_memcpy
      (eth->src_address, vrrp_src_mac_prefix, sizeof (vrrp_src_mac_prefix));
    eth->src_address[4] = mac_byte_ipver;
    eth->src_address[5] = vr->config.vr_id;
  
    n_bytes += vec_len (rewrite);
  
    vlib_buffer_chain_increase_length (b, b, n_bytes);
    vlib_buffer_advance (b, n_bytes);
  
    vec_free (rewrite);
  
    return n_bytes;
  }
  
  #define VRRP4_MCAST_ADDR_AS_U8 { 224, 0, 0, 18 }
  #define VRRP6_MCAST_ADDR_AS_U8 \
  { 0xff, 0x2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x12 }
  
  static const ip46_address_t vrrp4_mcast_addr = {
    .ip4 = {.as_u8 = VRRP4_MCAST_ADDR_AS_U8,},
  };
  
  static const ip46_address_t vrrp6_mcast_addr = {
    .ip6 = {.as_u8 = VRRP6_MCAST_ADDR_AS_U8,},
  };
  
  /* size of static parts of header + (# addrs * addr length) */
  always_inline u16
  vrrp_adv_payload_len (vrrp_vr_t * vr)
  {
    u16 addr_len = vrrp_vr_is_ipv6 (vr) ? 16 : 4;
  
    return sizeof (vrrp_header_t) + (vec_len (vr->config.vr_addrs) * addr_len);
  }
  
  static int
  vrrp_adv_l3_build (vrrp_vr_t * vr, vlib_buffer_t * b,
  		   const ip46_address_t * dst)
  {
    if (!vrrp_vr_is_ipv6 (vr))	/* IPv4 */
      {
        ip4_header_t *ip4 = vlib_buffer_get_current (b);
  
        clib_memset (ip4, 0, sizeof (*ip4));
        ip4->ip_version_and_header_length = 0x45;
        ip4->ttl = 255;
        ip4->protocol = IP_PROTOCOL_VRRP;
        clib_memcpy (&ip4->dst_address, &dst->ip4, sizeof (dst->ip4));
        fib_sas4_get (vr->config.sw_if_index, NULL, &ip4->src_address);
        ip4->length = clib_host_to_net_u16 (sizeof (*ip4) +
  					  vrrp_adv_payload_len (vr));
        ip4->checksum = ip4_header_checksum (ip4);
  
        vlib_buffer_chain_increase_length (b, b, sizeof (*ip4));
        vlib_buffer_advance (b, sizeof (*ip4));
  
        return sizeof (*ip4);
      }
    else
      {
        ip6_header_t *ip6 = vlib_buffer_get_current (b);
  
        clib_memset (ip6, 0, sizeof (*ip6));
        ip6->ip_version_traffic_class_and_flow_label = 0x00000060;
        ip6->hop_limit = 255;
        ip6->protocol = IP_PROTOCOL_VRRP;
        clib_memcpy (&ip6->dst_address, &dst->ip6, sizeof (dst->ip6));
        ip6_address_copy (&ip6->src_address,
  			ip6_get_link_local_address (vr->config.sw_if_index));
        ip6->payload_length = clib_host_to_net_u16 (vrrp_adv_payload_len (vr));
  
        vlib_buffer_chain_increase_length (b, b, sizeof (*ip6));
        vlib_buffer_advance (b, sizeof (*ip6));
  
        return sizeof (*ip6);
      }
  }
  
  
  u16
  vrrp_adv_csum (void *l3_hdr, void *payload, u8 is_ipv6, u16 len)
  {
    ip_csum_t csum = 0;
    u8 proto = IP_PROTOCOL_VRRP;
    int addr_len;
    int word_size = sizeof (uword);
    void *src_addr;
    int i;
  
    if (is_ipv6)
      {
        addr_len = 16;
        src_addr = &(((ip6_header_t *) l3_hdr)->src_address);
      }
    else
      {
        addr_len = 4;
        src_addr = &(((ip4_header_t *) l3_hdr)->src_address);
      }
  
    for (i = 0; i < (2 * addr_len); i += word_size)
      {
        if (word_size == sizeof (u64))
  	csum =
  	  ip_csum_with_carry (csum, clib_mem_unaligned (src_addr + i, u64));
        else
  	csum =
  	  ip_csum_with_carry (csum, clib_mem_unaligned (src_addr + i, u32));
      }
  
    csum = ip_csum_with_carry (csum,
  			     clib_host_to_net_u32 (len + (proto << 16)));
  
    /* now do the payload */
    csum = ip_incremental_checksum (csum, payload, len);
  
    csum = ~ip_csum_fold (csum);
  
    return (u16) csum;
  }
  
  static int
  vrrp_adv_payload_build (vrrp_vr_t * vr, vlib_buffer_t * b, int shutdown)
  {
    vrrp_header_t *vrrp = vlib_buffer_get_current (b);
    void *l3_hdr;
    ip46_address_t *vr_addr;
    void *hdr_addr;
    u8 is_ipv6;
    u8 n_addrs;
    int len;
  
    n_addrs = vec_len (vr->config.vr_addrs);
    is_ipv6 = vrrp_vr_is_ipv6 (vr);
  
    if (is_ipv6)
      {
        ip6_header_t *ip6;
  
        len = sizeof (*vrrp) + n_addrs * sizeof (ip6_address_t);;
        l3_hdr = vlib_buffer_get_current (b) - sizeof (ip6_header_t);
        ip6 = l3_hdr;
        ip6->payload_length = clib_host_to_net_u16 (len);
      }
    else
      {
        len = sizeof (*vrrp) + n_addrs * sizeof (ip4_address_t);
        l3_hdr = vlib_buffer_get_current (b) - sizeof (ip4_header_t);
      }
  
    vrrp->vrrp_version_and_type = 0x31;
    vrrp->vr_id = vr->config.vr_id;
    vrrp->priority = (shutdown) ? 0 : vrrp_vr_priority (vr);
    vrrp->n_addrs = vec_len (vr->config.vr_addrs);
    vrrp->rsvd_and_max_adv_int = clib_host_to_net_u16 (vr->config.adv_interval);
    vrrp->checksum = 0;
  
    hdr_addr = (void *) (vrrp + 1);
  
    vec_foreach (vr_addr, vr->config.vr_addrs)
    {
      if (is_ipv6)
        {
  	clib_memcpy (hdr_addr, &vr_addr->ip6, 16);
  	hdr_addr += 16;
        }
      else
        {
  	clib_memcpy (hdr_addr, &vr_addr->ip4, 4);
  	hdr_addr += 4;
        }
    }
  
    vlib_buffer_chain_increase_length (b, b, vrrp_adv_payload_len (vr));
  
    vrrp->checksum =
      vrrp_adv_csum (l3_hdr, vrrp, is_ipv6, vrrp_adv_payload_len (vr));
  
    return len;
  }
  
  static_always_inline u32
  vrrp_adv_next_node (vrrp_vr_t * vr)
  {
    if (vrrp_vr_is_unicast (vr))
      {
        if (vrrp_vr_is_ipv6 (vr))
  	return ip6_lookup_node.index;
        else
  	return ip4_lookup_node.index;
      }
    else
      {
        vrrp_main_t *vmp = &vrrp_main;
  
        return vmp->intf_output_node_idx;
      }
  }
  
  static_always_inline const ip46_address_t *
  vrrp_adv_mcast_addr (vrrp_vr_t * vr)
  {
    if (vrrp_vr_is_ipv6 (vr))
      return &vrrp6_mcast_addr;
  
    return &vrrp4_mcast_addr;
  }
  
  int
  vrrp_adv_send (vrrp_vr_t * vr, int shutdown)
  {
    vlib_main_t *vm = vlib_get_main ();
    vlib_frame_t *to_frame;
    int i, n_buffers = 1;
    u32 node_index, *to_next, *bi = 0;
    u8 is_unicast = vrrp_vr_is_unicast (vr);
  
    node_index = vrrp_adv_next_node (vr);
  
    if (is_unicast)
      n_buffers = vec_len (vr->config.peer_addrs);
  
    if (n_buffers < 1)
      {
        /* A unicast VR will not start without peers added so this should
         * not happen. Just avoiding a crash if it happened somehow.
         */
        clib_warning ("Unicast VR configuration corrupted for %U",
  		    format_vrrp_vr_key, vr);
        return -1;
      }
  
    vec_validate (bi, n_buffers - 1);
    if (vlib_buffer_alloc (vm, bi, n_buffers) != n_buffers)
      {
        clib_warning ("Buffer allocation failed for %U", format_vrrp_vr_key,
  		    vr);
        vec_free (bi);
        return -1;
      }
  
    to_frame = vlib_get_frame_to_node (vm, node_index);
    to_next = vlib_frame_vector_args (to_frame);
  
    for (i = 0; i < n_buffers; i++)
      {
        vlib_buffer_t *b;
        u32 bi0;
        const ip46_address_t *dst = vrrp_adv_mcast_addr (vr);
  
        bi0 = vec_elt (bi, i);
        b = vlib_get_buffer (vm, bi0);
  
        VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
        b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
        vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
        vnet_buffer (b)->sw_if_index[VLIB_TX] = vr->config.sw_if_index;
  
        if (is_unicast)
  	{
  	  dst = vec_elt_at_index (vr->config.peer_addrs, i);
  	  vnet_buffer (b)->sw_if_index[VLIB_TX] = ~0;
  	}
        else
  	vrrp_adv_l2_build_multicast (vr, b);
  
        vrrp_adv_l3_build (vr, b, dst);
        vrrp_adv_payload_build (vr, b, shutdown);
  
        vlib_buffer_reset (b);
  
        to_next[i] = bi0;
      }
  
    to_frame->n_vectors = n_buffers;
  
    vlib_put_frame_to_node (vm, node_index, to_frame);
  
    vec_free (bi);
  
    return 0;
  }
  
  static void
  vrrp6_na_pkt_build (vrrp_vr_t * vr, vlib_buffer_t * b, ip6_address_t * addr6)
  {
    vnet_main_t *vnm = vnet_get_main ();
    vlib_main_t *vm = vlib_get_main ();
    ethernet_header_t *eth;
    ip6_header_t *ip6;
    icmp6_neighbor_solicitation_or_advertisement_header_t *na;
    icmp6_neighbor_discovery_ethernet_link_layer_address_option_t *ll_opt;
    int payload_length, bogus_length;
    int rewrite_bytes = 0;
    u8 *rewrite;
    u8 dst_mac[6];
  
    /* L2 headers */
    eth = vlib_buffer_get_current (b);
  
    ip6_multicast_ethernet_address (dst_mac, IP6_MULTICAST_GROUP_ID_all_hosts);
    rewrite =
      ethernet_build_rewrite (vnm, vr->config.sw_if_index, VNET_LINK_IP6,
  			    dst_mac);
    rewrite_bytes += vec_len (rewrite);
    clib_memcpy (eth, rewrite, vec_len (rewrite));
    vec_free (rewrite);
  
    b->current_length += rewrite_bytes;
    vlib_buffer_advance (b, rewrite_bytes);
  
    /* IPv6 */
    ip6 = vlib_buffer_get_current (b);
  
    b->current_length += sizeof (*ip6);
    clib_memset (ip6, 0, sizeof (*ip6));
  
    ip6->ip_version_traffic_class_and_flow_label = 0x00000060;
    ip6->protocol = IP_PROTOCOL_ICMP6;
    ip6->hop_limit = 255;
    ip6_set_reserved_multicast_address (&ip6->dst_address,
  				      IP6_MULTICAST_SCOPE_link_local,
  				      IP6_MULTICAST_GROUP_ID_all_hosts);
    ip6_address_copy (&ip6->src_address,
  		    ip6_get_link_local_address (vr->config.sw_if_index));
  
  
    /* ICMPv6 */
    na = (icmp6_neighbor_solicitation_or_advertisement_header_t *) (ip6 + 1);
    ll_opt =
      (icmp6_neighbor_discovery_ethernet_link_layer_address_option_t *) (na +
  								       1);
  
    payload_length = sizeof (*na) + sizeof (*ll_opt);
    b->current_length += payload_length;
    clib_memset (na, 0, payload_length);
  
    na->icmp.type = ICMP6_neighbor_advertisement;	/* icmp code, csum are 0 */
    na->target_address = *addr6;
    na->advertisement_flags = clib_host_to_net_u32
      (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE
       | ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_ROUTER);
  
    ll_opt->header.type =
      ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address;
    ll_opt->header.n_data_u64s = 1;
    clib_memcpy (ll_opt->ethernet_address, vr->runtime.mac.bytes,
  	       sizeof (vr->runtime.mac));
  
    ip6->payload_length = clib_host_to_net_u16 (payload_length);
    na->icmp.checksum =
      ip6_tcp_udp_icmp_compute_checksum (vm, b, ip6, &bogus_length);
  }
  
  const mac_address_t broadcast_mac = {
    .bytes = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff,},
  };
  
  static void
  vrrp4_garp_pkt_build (vrrp_vr_t * vr, vlib_buffer_t * b, ip4_address_t * ip4)
  {
    vnet_main_t *vnm = vnet_get_main ();
    ethernet_header_t *eth;
    ethernet_arp_header_t *arp;
    int rewrite_bytes;
    u8 *rewrite;
  
    eth = vlib_buffer_get_current (b);
  
    rewrite =
      ethernet_build_rewrite (vnm, vr->config.sw_if_index, VNET_LINK_ARP,
  			    broadcast_mac.bytes);
    rewrite_bytes = vec_len (rewrite);
    clib_memcpy (eth, rewrite, rewrite_bytes);
    vec_free (rewrite);
  
    b->current_length += rewrite_bytes;
    vlib_buffer_advance (b, rewrite_bytes);
  
    arp = vlib_buffer_get_current (b);
    b->current_length += sizeof (*arp);
  
    clib_memset (arp, 0, sizeof (*arp));
  
    arp->l2_type = clib_host_to_net_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet);
    arp->l3_type = clib_host_to_net_u16 (ETHERNET_TYPE_IP4);
    arp->n_l2_address_bytes = 6;
    arp->n_l3_address_bytes = 4;
    arp->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request);
    arp->ip4_over_ethernet[0].mac = vr->runtime.mac;
    arp->ip4_over_ethernet[0].ip4 = *ip4;
    arp->ip4_over_ethernet[1].mac = broadcast_mac;
    arp->ip4_over_ethernet[1].ip4 = *ip4;
  }
  
  int
  vrrp_garp_or_na_send (vrrp_vr_t * vr)
  {
    vlib_main_t *vm = vlib_get_main ();
    vrrp_main_t *vmp = &vrrp_main;
    vlib_frame_t *to_frame;
    u32 *bi = 0;
    u32 n_buffers;
    u32 *to_next;
    int i;
  
    if (vec_len (vr->config.peer_addrs))
      return 0;			/* unicast is used in routed environments - don't garp */
  
    n_buffers = vec_len (vr->config.vr_addrs);
    if (!n_buffers)
      {
        clib_warning ("Unable to send gratuitous ARP for VR %U - no addresses",
  		    format_vrrp_vr_key, vr);
        return -1;
      }
  
    /* need to send a packet for each VR address */
    vec_validate (bi, n_buffers - 1);
  
    if (vlib_buffer_alloc (vm, bi, n_buffers) != n_buffers)
      {
        clib_warning ("Buffer allocation failed for %U", format_vrrp_vr_key,
  		    vr);
        vec_free (bi);
        return -1;
      }
  
    to_frame = vlib_get_frame_to_node (vm, vmp->intf_output_node_idx);
    to_frame->n_vectors = 0;
    to_next = vlib_frame_vector_args (to_frame);
  
    for (i = 0; i < n_buffers; i++)
      {
        vlib_buffer_t *b;
        ip46_address_t *addr;
  
        addr = vec_elt_at_index (vr->config.vr_addrs, i);
        b = vlib_get_buffer (vm, bi[i]);
  
        VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
        b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
        vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
        vnet_buffer (b)->sw_if_index[VLIB_TX] = vr->config.sw_if_index;
  
        if (vrrp_vr_is_ipv6 (vr))
  	vrrp6_na_pkt_build (vr, b, &addr->ip6);
        else
  	vrrp4_garp_pkt_build (vr, b, &addr->ip4);
  
        vlib_buffer_reset (b);
  
        to_next[i] = bi[i];
        to_frame->n_vectors++;
      }
  
    vlib_put_frame_to_node (vm, vmp->intf_output_node_idx, to_frame);
  
    return 0;
  }
  
  #define IGMP4_MCAST_ADDR_AS_U8 { 224, 0, 0, 22 }
  
  static const ip4_header_t igmp_ip4_mcast = {
    .ip_version_and_header_length = 0x46,	/* there's options! */
    .ttl = 1,
    .protocol = IP_PROTOCOL_IGMP,
    .tos = 0xc0,
    .dst_address = {.as_u8 = IGMP4_MCAST_ADDR_AS_U8,},
  };
  
  static void
  vrrp_igmp_pkt_build (vrrp_vr_t * vr, vlib_buffer_t * b)
  {
    ip4_header_t *ip4;
    u8 *ip4_options;
    igmp_membership_report_v3_t *report;
    igmp_membership_group_v3_t *group;
  
    ip4 = vlib_buffer_get_current (b);
    clib_memcpy (ip4, &igmp_ip4_mcast, sizeof (*ip4));
    fib_sas4_get (vr->config.sw_if_index, NULL, &ip4->src_address);
  
    vlib_buffer_chain_increase_length (b, b, sizeof (*ip4));
    vlib_buffer_advance (b, sizeof (*ip4));
  
    ip4_options = (u8 *) (ip4 + 1);
    ip4_options[0] = 0x94;	/* 10010100 == the router alert option */
    ip4_options[1] = 0x04;	/* length == 4 bytes */
    ip4_options[2] = 0x0;		/* value == Router shall examine packet */
    ip4_options[3] = 0x0;		/* reserved */
  
    vlib_buffer_chain_increase_length (b, b, 4);
    vlib_buffer_advance (b, 4);
  
    report = vlib_buffer_get_current (b);
  
    report->header.type = IGMP_TYPE_membership_report_v3;
    report->header.code = 0;
    report->header.checksum = 0;
    report->unused = 0;
    report->n_groups = clib_host_to_net_u16 (1);
  
    vlib_buffer_chain_increase_length (b, b, sizeof (*report));
    vlib_buffer_advance (b, sizeof (*report));
  
    group = vlib_buffer_get_current (b);
    group->type = IGMP_MEMBERSHIP_GROUP_change_to_exclude;
    group->n_aux_u32s = 0;
    group->n_src_addresses = 0;
    group->group_address.as_u32 = clib_host_to_net_u32 (0xe0000012);
  
    vlib_buffer_chain_increase_length (b, b, sizeof (*group));
    vlib_buffer_advance (b, sizeof (*group));
  
    ip4->length = clib_host_to_net_u16 (b->current_data);
    ip4->checksum = ip4_header_checksum (ip4);
  
    int payload_len = vlib_buffer_get_current (b) - ((void *) report);
    report->header.checksum =
      ~ip_csum_fold (ip_incremental_checksum (0, report, payload_len));
  
    vlib_buffer_reset (b);
  }
  
  /* multicast listener report packet format for ethernet. */
  typedef CLIB_PACKED (struct
  		     {
  		     ip6_hop_by_hop_ext_t ext_hdr;
  		     ip6_router_alert_option_t alert;
  		     ip6_padN_option_t pad;
  		     icmp46_header_t icmp;
  		     u16 rsvd;
  		     u16 num_addr_records;
  		     icmp6_multicast_address_record_t records[0];
  		     }) icmp6_multicast_listener_report_header_t;
  
  static void
  vrrp_icmp6_mlr_pkt_build (vrrp_vr_t * vr, vlib_buffer_t * b)
  {
    vlib_main_t *vm = vlib_get_main ();
    ip6_header_t *ip6;
    icmp6_multicast_listener_report_header_t *rh;
    icmp6_multicast_address_record_t *rr;
    ip46_address_t *vr_addr;
    int bogus_length, n_addrs;
    u16 payload_length;
  
    n_addrs = vec_len (vr->config.vr_addrs) + 1;
    payload_length = sizeof (*rh) + (n_addrs * sizeof (*rr));
    b->current_length = sizeof (*ip6) + payload_length;
    b->error = ICMP6_ERROR_NONE;
  
    ip6 = vlib_buffer_get_current (b);
    rh = (icmp6_multicast_listener_report_header_t *) (ip6 + 1);
    rr = (icmp6_multicast_address_record_t *) (rh + 1);
  
    /* IP header */
    clib_memset (ip6, 0, b->current_length);
    ip6->ip_version_traffic_class_and_flow_label =
      clib_host_to_net_u32 (0x60000000);
    ip6->hop_limit = 1;
    ip6->protocol = IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS;
    ip6_set_reserved_multicast_address (&ip6->dst_address,
  				      IP6_MULTICAST_SCOPE_link_local,
  				      IP6_MULTICAST_GROUP_ID_mldv2_routers);
    ip6_address_copy (&ip6->src_address,
  		    ip6_get_link_local_address (vr->config.sw_if_index));
  
    clib_memset (rh, 0, sizeof (*rh));
  
    /* v6 hop by hop extension header */
    rh->ext_hdr.next_hdr = IP_PROTOCOL_ICMP6;
    rh->ext_hdr.n_data_u64s = 0;
  
    rh->alert.type = IP6_MLDP_ALERT_TYPE;
    rh->alert.len = 2;
    rh->alert.value = 0;
  
    rh->pad.type = 1;
    rh->pad.len = 0;
  
    /* icmp6 header */
    rh->icmp.type = ICMP6_multicast_listener_report_v2;
    rh->icmp.checksum = 0;
  
    rh->rsvd = 0;
    rh->num_addr_records = clib_host_to_net_u16 (n_addrs);
  
    /* group addresses */
  
    /* All VRRP routers group */
    rr->type = 4;
    rr->aux_data_len_u32s = 0;
    rr->num_sources = 0;
    clib_memcpy
      (&rr->mcast_addr, &vrrp6_mcast_addr.ip6, sizeof (ip6_address_t));
  
    /* solicited node multicast addresses for VR addrs */
    vec_foreach (vr_addr, vr->config.vr_addrs)
    {
      u32 id;
  
      rr++;
      rr->type = 4;
      rr->aux_data_len_u32s = 0;
      rr->num_sources = 0;
  
      id = clib_net_to_host_u32 (vr_addr->ip6.as_u32[3]) & 0x00ffffff;
      ip6_set_solicited_node_multicast_address (&rr->mcast_addr, id);
    }
  
    ip6->payload_length = clib_host_to_net_u16 (payload_length);
    rh->icmp.checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ip6,
  							 &bogus_length);
  }
  
  int
  vrrp_vr_multicast_group_join (vrrp_vr_t * vr)
  {
    vlib_main_t *vm = vlib_get_main ();
    vlib_buffer_t *b;
    vlib_frame_t *f;
    vnet_main_t *vnm = vnet_get_main ();
    vrrp_intf_t *intf;
    u32 bi = 0, *to_next;
    int n_buffers = 1;
    u8 is_ipv6;
    u32 node_index;
  
    if (!vnet_sw_interface_is_up (vnm, vr->config.sw_if_index))
      return 0;
  
    if (vlib_buffer_alloc (vm, &bi, n_buffers) != n_buffers)
      {
        clib_warning ("Buffer allocation failed for %U", format_vrrp_vr_key,
  		    vr);
        return -1;
      }
  
    is_ipv6 = vrrp_vr_is_ipv6 (vr);
  
    b = vlib_get_buffer (vm, bi);
  
    VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
    b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
  
    vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
    vnet_buffer (b)->sw_if_index[VLIB_TX] = vr->config.sw_if_index;
  
    intf = vrrp_intf_get (vr->config.sw_if_index);
    vnet_buffer (b)->ip.adj_index[VLIB_TX] = intf->mcast_adj_index[is_ipv6];
  
    if (is_ipv6)
      {
        vrrp_icmp6_mlr_pkt_build (vr, b);
        node_index = ip6_rewrite_mcast_node.index;
      }
    else
      {
        vrrp_igmp_pkt_build (vr, b);
        node_index = ip4_rewrite_mcast_node.index;
      }
  
    f = vlib_get_frame_to_node (vm, node_index);
    to_next = vlib_frame_vector_args (f);
    to_next[0] = bi;
    f->n_vectors = 1;
  
    vlib_put_frame_to_node (vm, node_index, f);
  
    return f->n_vectors;
  }
  
  
  /*
   * fd.io coding-style-patch-verification: ON
   *
   * Local Variables:
   * eval: (c-set-style "gnu")
   * End:
   */
  