Beispiel #1
0
/* Note: on netlink systems, there should be a 1-to-1 mapping between interface
   names and ifindex values. */
static void set_ifindex(struct interface *ifp, ifindex_t ifi_index,
			struct zebra_ns *zns)
{
	struct interface *oifp;

	if (((oifp = if_lookup_by_index_per_ns(zns, ifi_index)) != NULL)
	    && (oifp != ifp)) {
		if (ifi_index == IFINDEX_INTERNAL)
			flog_err(
				LIB_ERR_INTERFACE,
				"Netlink is setting interface %s ifindex to reserved internal value %u",
				ifp->name, ifi_index);
		else {
			if (IS_ZEBRA_DEBUG_KERNEL)
				zlog_debug(
					"interface index %d was renamed from %s to %s",
					ifi_index, oifp->name, ifp->name);
			if (if_is_up(oifp))
				flog_err(
					LIB_ERR_INTERFACE,
					"interface rename detected on up interface: index %d was renamed from %s to %s, results are uncertain!",
					ifi_index, oifp->name, ifp->name);
			if_delete_update(oifp);
		}
	}
	if_set_index(ifp, ifi_index);
}
Beispiel #2
0
/* Interface adding function */
int
ifan_read (struct if_announcemsghdr *ifan)
{
  struct interface *ifp;

  ifp = if_lookup_by_index (ifan->ifan_index);
  if (ifp == NULL && ifan->ifan_what == IFAN_ARRIVAL)
    {
      /* Create Interface */
      ifp = if_get_by_name (ifan->ifan_name);
      ifp->ifindex = ifan->ifan_index;

      if_add_update (ifp);
    }
  else if (ifp != NULL && ifan->ifan_what == IFAN_DEPARTURE)
    {
      if_delete_update (ifp);
      if_delete (ifp);
    }

  if_get_flags (ifp);
  if_get_mtu (ifp);
  if_get_metric (ifp);

  if (IS_ZEBRA_DEBUG_KERNEL)
    zlog_info ("interface %s index %d", ifp->name, ifp->ifindex);

  return 0;
}
Beispiel #3
0
/* Interface adding function */
static int
ifan_read (struct if_announcemsghdr *ifan)
{
  struct interface *ifp;
  
  ifp = if_lookup_by_index (ifan->ifan_index);
  
  if (ifp)
    assert ( (ifp->ifindex == ifan->ifan_index) 
             || (ifp->ifindex == IFINDEX_INTERNAL) );

  if ( (ifp == NULL) 
      || ((ifp->ifindex == IFINDEX_INTERNAL)
          && (ifan->ifan_what == IFAN_ARRIVAL)) )
    {
      if (IS_ZEBRA_DEBUG_KERNEL)
        zlog_debug ("%s: creating interface for ifindex %d, name %s",
                    __func__, ifan->ifan_index, ifan->ifan_name);
      
      /* Create Interface */
      ifp = if_get_by_name_len(ifan->ifan_name,
			       strnlen(ifan->ifan_name,
				       sizeof(ifan->ifan_name)));
      ifp->ifindex = ifan->ifan_index;

      if_add_update (ifp);
    }
  else if (ifp != NULL && ifan->ifan_what == IFAN_DEPARTURE)
    if_delete_update (ifp);

  if_get_flags (ifp);
  if_get_mtu (ifp);
  if_get_metric (ifp);

  if (IS_ZEBRA_DEBUG_KERNEL)
    zlog_debug ("%s: interface %s index %d", 
                __func__, ifan->ifan_name, ifan->ifan_index);

  return 0;
}
Beispiel #4
0
/* Note: on netlink systems, there should be a 1-to-1 mapping between interface
   names and ifindex values. */
static void
set_ifindex(struct interface *ifp, unsigned int ifi_index)
{
  struct interface *oifp;

  if (((oifp = if_lookup_by_index(ifi_index)) != NULL) && (oifp != ifp))
    {
      if (ifi_index == IFINDEX_INTERNAL)
        zlog_err("Netlink is setting interface %s ifindex to reserved "
		 "internal value %u", ifp->name, ifi_index);
      else
        {
	  if (IS_DEBUG_HA(kroute, KROUTE))
	    zlog_debug("interface index %d was renamed from %s to %s",
	    	       ifi_index, oifp->name, ifp->name);
	  if (if_is_up(oifp))
	    zlog_err("interface rename detected on up interface: index %d "
		     "was renamed from %s to %s, results are uncertain!", 
	    	     ifi_index, oifp->name, ifp->name);
	  if_delete_update(oifp);
        }
    }
  ifp->ifindex = ifi_index;
}
Beispiel #5
0
/* Interface's address information get. */
int
ifam_read (struct ifa_msghdr *ifam)
{
  struct interface *ifp = NULL;
  union sockunion addr, mask, brd;
  char ifname[INTERFACE_NAMSIZ];
  short ifnlen = 0;
  char isalias = 0;
  int flags = 0;
  
  ifname[0] = ifname[INTERFACE_NAMSIZ - 1] = '\0';
  
  /* Allocate and read address information. */
  ifam_read_mesg (ifam, &addr, &mask, &brd, ifname, &ifnlen);
  
  if ((ifp = if_lookup_by_index(ifam->ifam_index)) == NULL)
    {
      zlog_warn ("%s: no interface for ifname %s, index %d", 
                 __func__, ifname, ifam->ifam_index);
      return -1;
    }
  
  if (ifnlen && strncmp (ifp->name, ifname, INTERFACE_NAMSIZ))
    isalias = 1;
  
  /* N.B. The info in ifa_msghdr does not tell us whether the RTA_BRD
     field contains a broadcast address or a peer address, so we are forced to
     rely upon the interface type. */
  if (if_is_pointopoint(ifp))
    SET_FLAG(flags, ZEBRA_IFA_PEER);

#if 0
  /* it might seem cute to grab the interface metric here, however
   * we're processing an address update message, and so some systems
   * (e.g. FBSD) dont bother to fill in ifam_metric. Disabled, but left
   * in deliberately, as comment.
   */
  ifp->metric = ifam->ifam_metric;
#endif

  /* Add connected address. */
  switch (sockunion_family (&addr))
    {
    case AF_INET:
      if (ifam->ifam_type == RTM_NEWADDR)
	connected_add_ipv4 (ifp, flags, &addr.sin.sin_addr, 
			    ip_masklen (mask.sin.sin_addr),
			    &brd.sin.sin_addr,
			    (isalias ? ifname : NULL));
      else
	connected_delete_ipv4 (ifp, flags, &addr.sin.sin_addr, 
			       ip_masklen (mask.sin.sin_addr),
			       &brd.sin.sin_addr);
      break;
#ifdef HAVE_IPV6
    case AF_INET6:
      /* Unset interface index from link-local address when IPv6 stack
	 is KAME. */
      if (IN6_IS_ADDR_LINKLOCAL (&addr.sin6.sin6_addr))
	SET_IN6_LINKLOCAL_IFINDEX (addr.sin6.sin6_addr, 0);

      if (ifam->ifam_type == RTM_NEWADDR)
	connected_add_ipv6 (ifp, flags, &addr.sin6.sin6_addr, 
			    ip6_masklen (mask.sin6.sin6_addr),
			    &brd.sin6.sin6_addr,
			    (isalias ? ifname : NULL));
      else
	connected_delete_ipv6 (ifp,
			       &addr.sin6.sin6_addr, 
			       ip6_masklen (mask.sin6.sin6_addr),
			       &brd.sin6.sin6_addr);
      break;
#endif /* HAVE_IPV6 */
    default:
      /* Unsupported family silently ignore... */
      break;
    }
  
  /* Check interface flag for implicit up of the interface. */
  if_refresh (ifp);

#ifdef SUNOS_5
  /* In addition to lacking IFANNOUNCE, on SUNOS IFF_UP is strange. 
   * See comments for SUNOS_5 in interface.c::if_flags_mangle.
   * 
   * Here we take care of case where the real IFF_UP was previously
   * unset (as kept in struct zebra_if.primary_state) and the mangled
   * IFF_UP (ie IFF_UP set || listcount(connected) has now transitioned
   * to unset due to the lost non-primary address having DELADDR'd.
   *
   * we must delete the interface, because in between here and next
   * event for this interface-name the administrator could unplumb
   * and replumb the interface.
   */
  if (!if_is_up (ifp))
    if_delete_update (ifp);
#endif /* SUNOS_5 */
  
  return 0;
}
Beispiel #6
0
/*
 * Handle struct if_msghdr obtained from reading routing socket or
 * sysctl (from interface_list).  There may or may not be sockaddrs
 * present after the header.
 */
int
ifm_read (struct if_msghdr *ifm)
{
  struct interface *ifp = NULL;
  char ifname[IFNAMSIZ];
  short ifnlen = 0;
  caddr_t *cp;
  
  /* terminate ifname at head (for strnlen) and tail (for safety) */
  ifname[IFNAMSIZ - 1] = '\0';
  
  /* paranoia: sanity check structure */
  if (ifm->ifm_msglen < sizeof(struct if_msghdr))
    {
      zlog_err ("ifm_read: ifm->ifm_msglen %d too short\n",
		ifm->ifm_msglen);
      return -1;
    }

  /*
   * Check for a sockaddr_dl following the message.  First, point to
   * where a socakddr might be if one follows the message.
   */
  cp = (void *)(ifm + 1);

#ifdef SUNOS_5
  /* 
   * XXX This behavior should be narrowed to only the kernel versions
   * for which the structures returned do not match the headers.
   *
   * if_msghdr_t on 64 bit kernels in Solaris 9 and earlier versions
   * is 12 bytes larger than the 32 bit version.
   */
  if (((struct sockaddr *) cp)->sa_family == AF_UNSPEC)
  	cp = cp + 12;
#endif

  RTA_ADDR_GET (NULL, RTA_DST, ifm->ifm_addrs, cp);
  RTA_ADDR_GET (NULL, RTA_GATEWAY, ifm->ifm_addrs, cp);
  RTA_ATTR_GET (NULL, RTA_NETMASK, ifm->ifm_addrs, cp);
  RTA_ADDR_GET (NULL, RTA_GENMASK, ifm->ifm_addrs, cp);
  RTA_NAME_GET (ifname, RTA_IFP, ifm->ifm_addrs, cp, ifnlen);
  RTA_ADDR_GET (NULL, RTA_IFA, ifm->ifm_addrs, cp);
  RTA_ADDR_GET (NULL, RTA_AUTHOR, ifm->ifm_addrs, cp);
  RTA_ADDR_GET (NULL, RTA_BRD, ifm->ifm_addrs, cp);
  
  if (IS_ZEBRA_DEBUG_KERNEL)
    zlog_debug ("%s: sdl ifname %s", __func__, (ifnlen ? ifname : "(nil)"));
  
  /* 
   * Look up on ifindex first, because ifindices are the primary handle for
   * interfaces across the user/kernel boundary, for most systems.  (Some
   * messages, such as up/down status changes on NetBSD, do not include a
   * sockaddr_dl).
   */
  if ( (ifp = if_lookup_by_index (ifm->ifm_index)) != NULL )
    {
      /* we have an ifp, verify that the name matches as some systems,
       * eg Solaris, have a 1:many association of ifindex:ifname
       * if they dont match, we dont have the correct ifp and should
       * set it back to NULL to let next check do lookup by name
       */
      if (ifnlen && (strncmp (ifp->name, ifname, IFNAMSIZ) != 0) )
        {
          if (IS_ZEBRA_DEBUG_KERNEL)
            zlog_debug ("%s: ifp name %s doesnt match sdl name %s",
                        __func__, ifp->name, ifname);
          ifp = NULL;
        }
    }
  
  /* 
   * If we dont have an ifp, try looking up by name.  Particularly as some
   * systems (Solaris) have a 1:many mapping of ifindex:ifname - the ifname
   * is therefore our unique handle to that interface.
   *
   * Interfaces specified in the configuration file for which the ifindex
   * has not been determined will have ifindex == IFINDEX_INTERNAL, and such
   * interfaces are found by this search, and then their ifindex values can
   * be filled in.
   */
  if ( (ifp == NULL) && ifnlen)
    ifp = if_lookup_by_name (ifname);

  /*
   * If ifp still does not exist or has an invalid index (IFINDEX_INTERNAL),
   * create or fill in an interface.
   */
  if ((ifp == NULL) || (ifp->ifindex == IFINDEX_INTERNAL))
    {
      /*
       * To create or fill in an interface, a sockaddr_dl (via
       * RTA_IFP) is required.
       */
      if (!ifnlen)
	{
	  zlog_warn ("Interface index %d (new) missing ifname\n",
		     ifm->ifm_index);
	  return -1;
	}

#ifndef RTM_IFANNOUNCE
      /* Down->Down interface should be ignored here.
       * See further comment below.
       */
      if (!CHECK_FLAG (ifm->ifm_flags, IFF_UP))
        return 0;
#endif /* !RTM_IFANNOUNCE */
      
      if (ifp == NULL)
        {
	  /* Interface that zebra was not previously aware of, so create. */ 
	  ifp = if_create (ifname, ifnlen);
	  if (IS_ZEBRA_DEBUG_KERNEL)
	    zlog_debug ("%s: creating ifp for ifindex %d", 
	                __func__, ifm->ifm_index);
        }

      if (IS_ZEBRA_DEBUG_KERNEL)
        zlog_debug ("%s: updated/created ifp, ifname %s, ifindex %d",
                    __func__, ifp->name, ifp->ifindex);
      /* 
       * Fill in newly created interface structure, or larval
       * structure with ifindex IFINDEX_INTERNAL.
       */
      ifp->ifindex = ifm->ifm_index;
      
#ifdef HAVE_BSD_LINK_DETECT /* translate BSD kernel msg for link-state */
      bsd_linkdetect_translate(ifm);
#endif /* HAVE_BSD_LINK_DETECT */

      if_flags_update (ifp, ifm->ifm_flags);
#if defined(__bsdi__)
      if_kvm_get_mtu (ifp);
#else
      if_get_mtu (ifp);
#endif /* __bsdi__ */
      if_get_metric (ifp);

      if_add_update (ifp);
    }
  else
    /*
     * Interface structure exists.  Adjust stored flags from
     * notification.  If interface has up->down or down->up
     * transition, call state change routines (to adjust routes,
     * notify routing daemons, etc.).  (Other flag changes are stored
     * but apparently do not trigger action.)
     */
    {
      if (ifp->ifindex != ifm->ifm_index)
        {
          zlog_warn ("%s: index mismatch, ifname %s, ifp index %d, "
                     "ifm index %d", 
                     __func__, ifp->name, ifp->ifindex, ifm->ifm_index);
          return -1;
        }
      
#ifdef HAVE_BSD_LINK_DETECT /* translate BSD kernel msg for link-state */
      bsd_linkdetect_translate(ifm);
#endif /* HAVE_BSD_LINK_DETECT */

      /* update flags and handle operative->inoperative transition, if any */
      if_flags_update (ifp, ifm->ifm_flags);
      
#ifndef RTM_IFANNOUNCE
      if (!if_is_up (ifp))
          {
            /* No RTM_IFANNOUNCE on this platform, so we can never
             * distinguish between ~IFF_UP and delete. We must presume
             * it has been deleted.
             * Eg, Solaris will not notify us of unplumb.
             *
             * XXX: Fixme - this should be runtime detected
             * So that a binary compiled on a system with IFANNOUNCE
             * will still behave correctly if run on a platform without
             */
            if_delete_update (ifp);
          }
#endif /* RTM_IFANNOUNCE */
      if (if_is_up (ifp))
      {
#if defined(__bsdi__)
        if_kvm_get_mtu (ifp);
#else
        if_get_mtu (ifp);
#endif /* __bsdi__ */
        if_get_metric (ifp);
      }
    }

#ifdef HAVE_NET_RT_IFLIST
  ifp->stats = ifm->ifm_data;
#endif /* HAVE_NET_RT_IFLIST */

  if (IS_ZEBRA_DEBUG_KERNEL)
    zlog_debug ("%s: interface %s index %d", 
                __func__, ifp->name, ifp->ifindex);

  return 0;
}
Beispiel #7
0
static int
netlink_link_change (struct sockaddr_nl *snl, struct nlmsghdr *h)
{
  int len;
  struct ifinfomsg *ifi;
  struct rtattr *tb[IFLA_MAX + 1];
  struct interface *ifp;
  char *name;

  ifi = NLMSG_DATA (h);

  if (!(h->nlmsg_type == RTM_NEWLINK || h->nlmsg_type == RTM_DELLINK))
    {
      /* If this is not link add/delete message so print warning. */
      zlog_warn ("netlink_link_change: wrong kernel message %d\n",
                 h->nlmsg_type);
      return 0;
    }

  len = h->nlmsg_len - NLMSG_LENGTH (sizeof (struct ifinfomsg));
  if (len < 0)
    return -1;

  /* Looking up interface name. */
  memset (tb, 0, sizeof tb);
  netlink_parse_rtattr (tb, IFLA_MAX, IFLA_RTA (ifi), len);

#ifdef IFLA_WIRELESS
  /* check for wireless messages to ignore */
  if ((tb[IFLA_WIRELESS] != NULL) && (ifi->ifi_change == 0))
    {
      if (IS_DEBUG_HA(kroute, KROUTE))
        zlog_debug ("%s: ignoring IFLA_WIRELESS message", __func__);
      return 0;
    }
#endif /* IFLA_WIRELESS */
  
  if (tb[IFLA_IFNAME] == NULL)
    return -1;
  name = (char *) RTA_DATA (tb[IFLA_IFNAME]);

  /* Add interface. */
  if (h->nlmsg_type == RTM_NEWLINK)
    {
      ifp = if_lookup_by_name (name);

      if (ifp == NULL || !CHECK_FLAG (ifp->status, KROUTE_INTERFACE_ACTIVE))
        {
          if (ifp == NULL)
            ifp = if_get_by_name (name);

          set_ifindex(ifp, ifi->ifi_index);
          ifp->flags = ifi->ifi_flags & 0x0000fffff;
          ifp->mtu6 = ifp->mtu = *(int *) RTA_DATA (tb[IFLA_MTU]);
          ifp->metric = 1;

          netlink_interface_update_hw_addr (tb, ifp);

          /* If new link is added. */
          if_add_update (ifp);
        }
      else
        {
          /* Interface status change. */
          set_ifindex(ifp, ifi->ifi_index);
          ifp->mtu6 = ifp->mtu = *(int *) RTA_DATA (tb[IFLA_MTU]);
          ifp->metric = 1;

          netlink_interface_update_hw_addr (tb, ifp);

          if (if_is_operative (ifp))
            {
              ifp->flags = ifi->ifi_flags & 0x0000fffff;
              if (!if_is_operative (ifp))
                if_down (ifp);
	      else
		/* Must notify client daemons of new interface status. */
	        kroute_interface_up_update (ifp);
            }
          else
            {
              ifp->flags = ifi->ifi_flags & 0x0000fffff;
              if (if_is_operative (ifp))
                if_up (ifp);
            }
        }
    }
  else
    {
      /* RTM_DELLINK. */
      ifp = if_lookup_by_name (name);

      if (ifp == NULL)
        {
          zlog (NULL, LOG_WARNING, "interface %s is deleted but can't find",
                name);
          return 0;
        }

      if_delete_update (ifp);
    }

  return 0;
}
Beispiel #8
0
int
netlink_link_change (struct sockaddr_nl *snl, struct nlmsghdr *h)
{
    int len;
    struct ifinfomsg *ifi;
    struct rtattr *tb [IFLA_MAX + 1];
    struct interface *ifp;
    char *name;

    ifi = NLMSG_DATA (h);

    if (! (h->nlmsg_type == RTM_NEWLINK || h->nlmsg_type == RTM_DELLINK))
    {
        /* If this is not link add/delete message so print warning. */
        zlog_warn ("netlink_link_change: wrong kernel message %d\n",
                   h->nlmsg_type);
        return 0;
    }

    len = h->nlmsg_len - NLMSG_LENGTH (sizeof (struct ifinfomsg));
    if (len < 0)
        return -1;

    /* Looking up interface name. */
    memset (tb, 0, sizeof tb);
    netlink_parse_rtattr (tb, IFLA_MAX, IFLA_RTA (ifi), len);
    if (tb[IFLA_IFNAME] == NULL)
        return -1;
    name = (char *)RTA_DATA(tb[IFLA_IFNAME]);

    /* Add interface. */
    if (h->nlmsg_type == RTM_NEWLINK)
    {
        ifp = if_lookup_by_name (name);

        if (ifp == NULL || ! CHECK_FLAG (ifp->status, ZEBRA_INTERFACE_ACTIVE))
        {
            if (ifp == NULL)
                ifp = if_get_by_name (name);

            ifp->ifindex = ifi->ifi_index;
            ifp->flags = ifi->ifi_flags & 0x0000fffff;
            ifp->mtu = *(int *)RTA_DATA (tb[IFLA_MTU]);
            ifp->metric = 1;

            /* If new link is added. */
            if_add_update(ifp);
        }
        else
        {
            /* Interface status change. */
            ifp->ifindex = ifi->ifi_index;
            ifp->mtu = *(int *)RTA_DATA (tb[IFLA_MTU]);
            ifp->metric = 1;

            if (if_is_up (ifp))
            {
                ifp->flags = ifi->ifi_flags & 0x0000fffff;
                if (! if_is_up (ifp))
                    if_down (ifp);
            }
            else
            {
                ifp->flags = ifi->ifi_flags & 0x0000fffff;
                if (if_is_up (ifp))
                    if_up (ifp);
            }
        }
    }
    else
    {
        /* RTM_DELLINK. */
        ifp = if_lookup_by_name (name);

        if (ifp == NULL)
        {
            zlog (NULL, LOG_WARNING, "interface %s is deleted but can't find",
                  ifp->name);
            return 0;
        }

        if_delete_update (ifp);
    }

    return 0;
}
Beispiel #9
0
int netlink_link_change(struct nlmsghdr *h, ns_id_t ns_id, int startup)
{
	int len;
	struct ifinfomsg *ifi;
	struct rtattr *tb[IFLA_MAX + 1];
	struct rtattr *linkinfo[IFLA_MAX + 1];
	struct interface *ifp;
	char *name = NULL;
	char *kind = NULL;
	char *desc = NULL;
	char *slave_kind = NULL;
	struct zebra_ns *zns;
	vrf_id_t vrf_id = VRF_DEFAULT;
	zebra_iftype_t zif_type = ZEBRA_IF_OTHER;
	zebra_slave_iftype_t zif_slave_type = ZEBRA_IF_SLAVE_NONE;
	ifindex_t bridge_ifindex = IFINDEX_INTERNAL;
	ifindex_t link_ifindex = IFINDEX_INTERNAL;


	zns = zebra_ns_lookup(ns_id);
	ifi = NLMSG_DATA(h);

	/* assume if not default zns, then new VRF */
	if (!(h->nlmsg_type == RTM_NEWLINK || h->nlmsg_type == RTM_DELLINK)) {
		/* If this is not link add/delete message so print warning. */
		zlog_warn("netlink_link_change: wrong kernel message %d",
			  h->nlmsg_type);
		return 0;
	}

	if (!(ifi->ifi_family == AF_UNSPEC || ifi->ifi_family == AF_BRIDGE
	      || ifi->ifi_family == AF_INET6)) {
		zlog_warn(
			"Invalid address family: %u received from kernel link change: %u",
			ifi->ifi_family, h->nlmsg_type);
		return 0;
	}

	len = h->nlmsg_len - NLMSG_LENGTH(sizeof(struct ifinfomsg));
	if (len < 0) {
		zlog_err("%s: Message received from netlink is of a broken size %d %zu",
			 __PRETTY_FUNCTION__, h->nlmsg_len,
			 (size_t)NLMSG_LENGTH(sizeof(struct ifinfomsg)));
		return -1;
	}

	/* We are interested in some AF_BRIDGE notifications. */
	if (ifi->ifi_family == AF_BRIDGE)
		return netlink_bridge_interface(h, len, ns_id, startup);

	/* Looking up interface name. */
	memset(tb, 0, sizeof tb);
	memset(linkinfo, 0, sizeof linkinfo);
	netlink_parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);

	/* check for wireless messages to ignore */
	if ((tb[IFLA_WIRELESS] != NULL) && (ifi->ifi_change == 0)) {
		if (IS_ZEBRA_DEBUG_KERNEL)
			zlog_debug("%s: ignoring IFLA_WIRELESS message",
				   __func__);
		return 0;
	}

	if (tb[IFLA_IFNAME] == NULL)
		return -1;
	name = (char *)RTA_DATA(tb[IFLA_IFNAME]);

	if (tb[IFLA_LINKINFO]) {
		parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);

		if (linkinfo[IFLA_INFO_KIND])
			kind = RTA_DATA(linkinfo[IFLA_INFO_KIND]);

		if (linkinfo[IFLA_INFO_SLAVE_KIND])
			slave_kind = RTA_DATA(linkinfo[IFLA_INFO_SLAVE_KIND]);

		netlink_determine_zebra_iftype(kind, &zif_type);
	}

	/* If linking to another interface, note it. */
	if (tb[IFLA_LINK])
		link_ifindex = *(ifindex_t *)RTA_DATA(tb[IFLA_LINK]);

	if (tb[IFLA_IFALIAS]) {
		desc = (char *)RTA_DATA(tb[IFLA_IFALIAS]);
	}

	/* If VRF, create or update the VRF structure itself. */
	if (zif_type == ZEBRA_IF_VRF && !vrf_is_backend_netns()) {
		netlink_vrf_change(h, tb[IFLA_LINKINFO], name);
		vrf_id = (vrf_id_t)ifi->ifi_index;
	}

	/* See if interface is present. */
	ifp = if_lookup_by_name_per_ns(zns, name);

	if (ifp) {
		if (ifp->desc)
			XFREE(MTYPE_TMP, ifp->desc);
		if (desc)
			ifp->desc = XSTRDUP(MTYPE_TMP, desc);
	}

	if (h->nlmsg_type == RTM_NEWLINK) {
		if (tb[IFLA_MASTER]) {
			if (slave_kind && (strcmp(slave_kind, "vrf") == 0)
			    && !vrf_is_backend_netns()) {
				zif_slave_type = ZEBRA_IF_SLAVE_VRF;
				vrf_id = *(uint32_t *)RTA_DATA(tb[IFLA_MASTER]);
			} else if (slave_kind
				   && (strcmp(slave_kind, "bridge") == 0)) {
				zif_slave_type = ZEBRA_IF_SLAVE_BRIDGE;
				bridge_ifindex =
					*(ifindex_t *)RTA_DATA(tb[IFLA_MASTER]);
			} else
				zif_slave_type = ZEBRA_IF_SLAVE_OTHER;
		}
		if (vrf_is_backend_netns())
			vrf_id = (vrf_id_t)ns_id;
		if (ifp == NULL
		    || !CHECK_FLAG(ifp->status, ZEBRA_INTERFACE_ACTIVE)) {
			/* Add interface notification from kernel */
			if (IS_ZEBRA_DEBUG_KERNEL)
				zlog_debug(
					"RTM_NEWLINK ADD for %s(%u) vrf_id %u type %d "
					"sl_type %d master %u flags 0x%x",
					name, ifi->ifi_index, vrf_id, zif_type,
					zif_slave_type, bridge_ifindex,
					ifi->ifi_flags);

			if (ifp == NULL) {
				/* unknown interface */
				ifp = if_get_by_name(name, vrf_id, 0);
			} else {
				/* pre-configured interface, learnt now */
				if (ifp->vrf_id != vrf_id)
					if_update_to_new_vrf(ifp, vrf_id);
			}

			/* Update interface information. */
			set_ifindex(ifp, ifi->ifi_index, zns);
			ifp->flags = ifi->ifi_flags & 0x0000fffff;
			if (!tb[IFLA_MTU]) {
				zlog_warn(
					"RTM_NEWLINK for interface %s(%u) without MTU set",
					name, ifi->ifi_index);
				return 0;
			}
			ifp->mtu6 = ifp->mtu = *(int *)RTA_DATA(tb[IFLA_MTU]);
			ifp->metric = 0;
			ifp->ptm_status = ZEBRA_PTM_STATUS_UNKNOWN;

			/* Set interface type */
			zebra_if_set_ziftype(ifp, zif_type, zif_slave_type);
			if (IS_ZEBRA_IF_VRF(ifp))
				SET_FLAG(ifp->status,
					 ZEBRA_INTERFACE_VRF_LOOPBACK);

			/* Update link. */
			zebra_if_update_link(ifp, link_ifindex);

			netlink_interface_update_hw_addr(tb, ifp);

			/* Inform clients, install any configured addresses. */
			if_add_update(ifp);

			/* Extract and save L2 interface information, take
			 * additional actions. */
			netlink_interface_update_l2info(
				ifp, linkinfo[IFLA_INFO_DATA], 1);
			if (IS_ZEBRA_IF_BRIDGE_SLAVE(ifp))
				zebra_l2if_update_bridge_slave(ifp,
							       bridge_ifindex);
			if_netlink_check_ifp_instance_consistency(RTM_NEWLINK,
								  ifp, ns_id);
		} else if (ifp->vrf_id != vrf_id) {
			/* VRF change for an interface. */
			if (IS_ZEBRA_DEBUG_KERNEL)
				zlog_debug(
					"RTM_NEWLINK vrf-change for %s(%u) "
					"vrf_id %u -> %u flags 0x%x",
					name, ifp->ifindex, ifp->vrf_id, vrf_id,
					ifi->ifi_flags);

			if_handle_vrf_change(ifp, vrf_id);
		} else {
			int was_bridge_slave;

			/* Interface update. */
			if (IS_ZEBRA_DEBUG_KERNEL)
				zlog_debug(
					"RTM_NEWLINK update for %s(%u) "
					"sl_type %d master %u flags 0x%x",
					name, ifp->ifindex, zif_slave_type,
					bridge_ifindex, ifi->ifi_flags);

			set_ifindex(ifp, ifi->ifi_index, zns);
			if (!tb[IFLA_MTU]) {
				zlog_warn(
					"RTM_NEWLINK for interface %s(%u) without MTU set",
					name, ifi->ifi_index);
				return 0;
			}
			ifp->mtu6 = ifp->mtu = *(int *)RTA_DATA(tb[IFLA_MTU]);
			ifp->metric = 0;

			/* Update interface type - NOTE: Only slave_type can
			 * change. */
			was_bridge_slave = IS_ZEBRA_IF_BRIDGE_SLAVE(ifp);
			zebra_if_set_ziftype(ifp, zif_type, zif_slave_type);

			netlink_interface_update_hw_addr(tb, ifp);

			if (if_is_no_ptm_operative(ifp)) {
				ifp->flags = ifi->ifi_flags & 0x0000fffff;
				if (!if_is_no_ptm_operative(ifp)) {
					if (IS_ZEBRA_DEBUG_KERNEL)
						zlog_debug(
							"Intf %s(%u) has gone DOWN",
							name, ifp->ifindex);
					if_down(ifp);
				} else if (if_is_operative(ifp)) {
					/* Must notify client daemons of new
					 * interface status. */
					if (IS_ZEBRA_DEBUG_KERNEL)
						zlog_debug(
							"Intf %s(%u) PTM up, notifying clients",
							name, ifp->ifindex);
					zebra_interface_up_update(ifp);
				}
			} else {
				ifp->flags = ifi->ifi_flags & 0x0000fffff;
				if (if_is_operative(ifp)) {
					if (IS_ZEBRA_DEBUG_KERNEL)
						zlog_debug(
							"Intf %s(%u) has come UP",
							name, ifp->ifindex);
					if_up(ifp);
				}
			}

			/* Extract and save L2 interface information, take
			 * additional actions. */
			netlink_interface_update_l2info(
				ifp, linkinfo[IFLA_INFO_DATA], 0);
			if (IS_ZEBRA_IF_BRIDGE_SLAVE(ifp) || was_bridge_slave)
				zebra_l2if_update_bridge_slave(ifp,
							       bridge_ifindex);
			if_netlink_check_ifp_instance_consistency(RTM_NEWLINK,
								  ifp, ns_id);
		}
	} else {
		/* Delete interface notification from kernel */
		if (ifp == NULL) {
			zlog_warn("RTM_DELLINK for unknown interface %s(%u)",
				  name, ifi->ifi_index);
			return 0;
		}

		if (IS_ZEBRA_DEBUG_KERNEL)
			zlog_debug("RTM_DELLINK for %s(%u)", name,
				   ifp->ifindex);

		UNSET_FLAG(ifp->status, ZEBRA_INTERFACE_VRF_LOOPBACK);

		/* Special handling for bridge or VxLAN interfaces. */
		if (IS_ZEBRA_IF_BRIDGE(ifp))
			zebra_l2_bridge_del(ifp);
		else if (IS_ZEBRA_IF_VXLAN(ifp))
			zebra_l2_vxlanif_del(ifp);

		if (!IS_ZEBRA_IF_VRF(ifp))
			if_delete_update(ifp);
		if_netlink_check_ifp_instance_consistency(RTM_DELLINK,
							  ifp, ns_id);
	}

	return 0;
}