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688901a664
This adds a separate package for the 2.0 branch of Bird, allowing it to co-exist with the bird1 package. The two packages conflict with each other, so they can't be installed at the same time; but in the build system they coexist just fine. Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>
119 lines
4.4 KiB
Diff
119 lines
4.4 KiB
Diff
From 70fab17837dbb4c5848681e4c6b9b90891891130 Mon Sep 17 00:00:00 2001
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From: "Ondrej Zajicek (work)" <santiago@crfreenet.org>
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Date: Thu, 3 May 2018 16:55:11 +0200
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Subject: [PATCH 1/2] Babel: Add option to randomize router ID
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When a Babel node restarts, it loses its sequence number, which can cause
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its routes to be rejected by peers until the state is cleared out by other
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nodes in the network (which can take on the order of minutes).
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There are two ways to fix this: Having stable storage to keep the sequence
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number across restarts, or picking a different router ID each time.
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This implements the latter, by introducing a new option that will cause
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BIRD to randomize a high 32 bits of router ID every time it starts up.
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This avoids the problem at the cost of not having stable router IDs in
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the network.
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Thanks to Toke Hoiland-Jorgensen for the patch.
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---
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doc/bird.sgml | 10 ++++++++++
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proto/babel/babel.c | 11 +++++++++++
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proto/babel/babel.h | 1 +
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proto/babel/config.Y | 3 ++-
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4 files changed, 24 insertions(+), 1 deletion(-)
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diff --git a/doc/bird.sgml b/doc/bird.sgml
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index 1191fa03..ae308d4c 100644
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--- a/doc/bird.sgml
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+++ b/doc/bird.sgml
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@@ -1691,6 +1691,7 @@ supports the following per-interface configuration options:
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protocol babel [<name>] {
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ipv4 { <channel config> };
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ipv6 [sadr] { <channel config> };
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+ randomize router id <switch>;
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interface <interface pattern> {
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type <wired|wireless>;
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rxcost <number>;
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@@ -1713,6 +1714,15 @@ protocol babel [<name>] {
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<tag><label id="babel-channel">ipv4 | ipv6 [sadr] <m/channel config/</tag>
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The supported channels are IPv4, IPv6, and IPv6 SADR.
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+ <tag><label id="babel-random-router-id">randomize router id <m/switch/</tag>
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+ If enabled, Bird will randomize the top 32 bits of its router ID whenever
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+ the protocol instance starts up. If a Babel node restarts, it loses its
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+ sequence number, which can cause its routes to be rejected by peers until
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+ the state is cleared out by other nodes in the network (which can take on
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+ the order of minutes). Enabling this option causes Bird to pick a random
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+ router ID every time it starts up, which avoids this problem at the cost
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+ of not having stable router IDs in the network. Default: no.
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+
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<tag><label id="babel-type">type wired|wireless </tag>
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This option specifies the interface type: Wired or wireless. On wired
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interfaces a neighbor is considered unreachable after a small number of
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diff --git a/proto/babel/babel.c b/proto/babel/babel.c
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index 797a83d4..ce05191c 100644
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--- a/proto/babel/babel.c
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+++ b/proto/babel/babel.c
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@@ -2226,6 +2226,14 @@ babel_init(struct proto_config *CF)
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return P;
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}
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+static inline void
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+babel_randomize_router_id(struct babel_proto *p)
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+{
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+ p->router_id &= (u64) 0xffffffff;
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+ p->router_id |= ((u64) random()) << 32;
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+ TRACE(D_EVENTS, "Randomized router ID to %lR", p->router_id);
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+}
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+
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static int
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babel_start(struct proto *P)
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{
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@@ -2244,6 +2252,9 @@ babel_start(struct proto *P)
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p->update_seqno = 1;
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p->router_id = proto_get_router_id(&cf->c);
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+ if (cf->randomize_router_id)
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+ babel_randomize_router_id(p);
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+
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p->route_slab = sl_new(P->pool, sizeof(struct babel_route));
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p->source_slab = sl_new(P->pool, sizeof(struct babel_source));
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p->msg_slab = sl_new(P->pool, sizeof(struct babel_msg_node));
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diff --git a/proto/babel/babel.h b/proto/babel/babel.h
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index b194ce30..e5c9cd5b 100644
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--- a/proto/babel/babel.h
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+++ b/proto/babel/babel.h
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@@ -112,6 +112,7 @@ struct babel_config {
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struct proto_config c;
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list iface_list; /* List of iface configs (struct babel_iface_config) */
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uint hold_time; /* Time to hold stale entries and unreachable routes */
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+ u8 randomize_router_id;
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struct channel_config *ip4_channel;
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struct channel_config *ip6_channel;
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diff --git a/proto/babel/config.Y b/proto/babel/config.Y
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index 7adfb4bb..205b4e4f 100644
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--- a/proto/babel/config.Y
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+++ b/proto/babel/config.Y
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@@ -25,7 +25,7 @@ CF_DECLS
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CF_KEYWORDS(BABEL, INTERFACE, METRIC, RXCOST, HELLO, UPDATE, INTERVAL, PORT,
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TYPE, WIRED, WIRELESS, RX, TX, BUFFER, PRIORITY, LENGTH, CHECK, LINK,
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NEXT, HOP, IPV4, IPV6, BABEL_METRIC, SHOW, INTERFACES, NEIGHBORS,
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- ENTRIES)
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+ ENTRIES, RANDOMIZE, ROUTER, ID)
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CF_GRAMMAR
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@@ -42,6 +42,7 @@ babel_proto_item:
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proto_item
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| proto_channel
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| INTERFACE babel_iface
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+ | RANDOMIZE ROUTER ID bool { BABEL_CFG->randomize_router_id = $4; }
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;
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babel_proto_opts:
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--
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2.17.0
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