staticd/static_nht.c

   1 /*
   2  * Static NHT code.
   3  * Copyright (C) 2018 Cumulus Networks, Inc.
   4  *               Donald Sharp
   5  *
   6  * FRR is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2, or (at your option) any
   9  * later version.
  10  *
  11  * FRR is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; see the file COPYING; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20 #include <zebra.h>
  21
  22 #include "prefix.h"
  23 #include "table.h"
  24 #include "vrf.h"
  25 #include "nexthop.h"
  26
  27 #include "static_vrf.h"
  28 #include "static_routes.h"
  29 #include "static_zebra.h"
  30 #include "static_nht.h"
  31
  32 void static_nht_update(struct prefix *p, uint32_t nh_num,
  33                        afi_t afi, vrf_id_t vrf_id)
  34 {
  35         struct route_table *stable;
  36         struct static_route *si;
  37         struct static_vrf *svrf;
  38         struct route_node *rn;
  39         struct vrf *vrf;
  40         bool orig;
  41         bool reinstall;
  42
  43         vrf = vrf_lookup_by_id(vrf_id);
  44
  45         if (!vrf->info)
  46                 return;
  47
  48         svrf = vrf->info;
  49         stable = static_vrf_static_table(afi, SAFI_UNICAST, svrf);
  50         if (!stable)
  51                 return;
  52
  53         for (rn = route_top(stable); rn; rn = route_next(rn)) {
  54                 reinstall = false;
  55                 for (si = rn->info; si; si = si->next) {
  56                         if (si->type != STATIC_IPV4_GATEWAY &&
  57                             si->type != STATIC_IPV6_GATEWAY)
  58                                 continue;
  59
  60                         orig = si->nh_valid;
  61                         if (p->family == AF_INET &&
  62                             p->u.prefix4.s_addr == si->addr.ipv4.s_addr)
  63                                 si->nh_valid = !!nh_num;
  64
  65                         if (p->family == AF_INET6 &&
  66                             memcmp(&p->u.prefix6, &si->addr.ipv6, 16) == 0)
  67                                 si->nh_valid = !!nh_num;
  68
  69                         if (orig != si->nh_valid)
  70                                 reinstall = true;
  71                 }
  72                 if (reinstall)
  73                         static_zebra_route_add(rn, vrf_id, SAFI_UNICAST, true);
  74         }
  75 }