bird2/patches/0001-babel-Set-onlink-flag-for-IPv4-routes-with-unreachab.patch

   1 From 0ca3156f64a46c52c6d6fc913958f83970d3e57f Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Toke=20H=C3=B8iland-J=C3=B8rgensen?= <toke@toke.dk>
   3 Date: Mon, 30 Apr 2018 11:13:02 +0200
   4 Subject: [PATCH] babel: Set onlink flag for IPv4 routes with unreachable next
   5  hop
   6 MIME-Version: 1.0
   7 Content-Type: text/plain; charset=UTF-8
   8 Content-Transfer-Encoding: 8bit
   9
  10 If the next hop of a route is not a reachable address, the route should be
  11 installed as onlink. This enables a configuration common in mesh networks
  12 where the mesh interface is assigned a /32 and babel handles the routing by
  13 installing onlink routes.
  14
  15 Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>
  16 ---
  17  proto/babel/babel.c | 7 +++++++
  18  1 file changed, 7 insertions(+)
  19
  20 diff --git a/proto/babel/babel.c b/proto/babel/babel.c
  21 index ce05191c..afd2eb19 100644
  22 --- a/proto/babel/babel.c
  23 +++ b/proto/babel/babel.c
  24 @@ -640,6 +640,13 @@ babel_announce_rte(struct babel_proto *p, struct babel_entry *e)
  25        .nh.iface = r->neigh->ifa->iface,
  26      };
  27
  28 +    /* If we cannot find a reachable neighbour, set the entry to be onlink. This
  29 +     * makes it possible to, e.g., assign /32 addresses on a mesh interface and
  30 +     * have routing work.
  31 +     */
  32 +    if (!neigh_find(&p->p, r->next_hop, r->neigh->ifa->iface, 0))
  33 +           a0.nh.flags = RNF_ONLINK;
  34 +
  35      rta *a = rta_lookup(&a0);
  36      rte *rte = rte_get_temp(a);
  37      rte->u.babel.seqno = r->seqno;
  38 --
  39 2.17.0
  40