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