pimd/pim_rpf.h

   1 /*
   2   PIM for Quagga
   3   Copyright (C) 2008  Everton da Silva Marques
   4
   5   This program is free software; you can redistribute it and/or modify
   6   it under the terms of the GNU General Public License as published by
   7   the Free Software Foundation; either version 2 of the License, or
   8   (at your option) any later version.
   9
  10   This program is distributed in the hope that it will be useful, but
  11   WITHOUT ANY WARRANTY; without even the implied warranty of
  12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13   General Public License for more details.
  14
  15   You should have received a copy of the GNU General Public License
  16   along with this program; see the file COPYING; if not, write to the
  17   Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
  18   MA 02110-1301 USA
  19 */
  20
  21 #ifndef PIM_RPF_H
  22 #define PIM_RPF_H
  23
  24 #include <zebra.h>
  25
  26 #include "pim_upstream.h"
  27 #include "pim_neighbor.h"
  28
  29 /*
  30   RFC 4601:
  31
  32   Metric Preference
  33     Preference value assigned to the unicast routing protocol that
  34     provided the route to the multicast source or Rendezvous-Point.
  35
  36   Metric
  37     The unicast routing table metric associated with the route used to
  38     reach the multicast source or Rendezvous-Point.  The metric is in
  39     units applicable to the unicast routing protocol used.
  40 */
  41 struct pim_nexthop {
  42   struct in_addr    last_lookup;
  43   long long         last_lookup_time;
  44   struct interface *interface;              /* RPF_interface(S) */
  45   struct prefix     mrib_nexthop_addr;      /* MRIB.next_hop(S) */
  46   uint32_t          mrib_metric_preference; /* MRIB.pref(S) */
  47   uint32_t          mrib_route_metric;      /* MRIB.metric(S) */
  48 };
  49
  50 struct pim_rpf {
  51   struct pim_nexthop source_nexthop;
  52   struct prefix      rpf_addr;               /* RPF'(S,G) */
  53 };
  54
  55 enum pim_rpf_result {
  56   PIM_RPF_OK = 0,
  57   PIM_RPF_CHANGED,
  58   PIM_RPF_FAILURE
  59 };
  60
  61 struct pim_upstream;
  62
  63 extern long long nexthop_lookups_avoided;
  64
  65 int pim_nexthop_lookup(struct pim_nexthop *nexthop, struct in_addr addr, int neighbor_needed);
  66 enum pim_rpf_result pim_rpf_update(struct pim_upstream *up, struct in_addr *old_rpf_addr);
  67
  68 int pim_rpf_addr_is_inaddr_none (struct pim_rpf *rpf);
  69 int pim_rpf_addr_is_inaddr_any (struct pim_rpf *rpf);
  70
  71 int pim_rpf_is_same (struct pim_rpf *rpf1, struct pim_rpf *rpf2);
  72 void pim_rpf_set_refresh_time (void);
  73 #endif /* PIM_RPF_H */