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From 595b2e2e87f152c4ade7e2d66cb78915096f60c2 Mon Sep 17 00:00:00 2001
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From: Donald Sharp <donaldsharp72@gmail.com>
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Date: Mon, 2 Mar 2020 11:23:36 -0500
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Subject: [PATCH] Ignore routes in non-main tables
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Route lookup in Linux is bounded by `ip rules` as well
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as the contents of specific routing tables. With the
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advent of vrf's(l3mdev's) non-default tables are regularly being
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used for routing purposes.
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dnsmasq listens to all route changes on the box and responds
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to each one with an event. This is *expensive* when a full
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BGP routing table is placed into the linux kernel, moreso
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when dnsmasq is responding to events in tables that it will
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never actually need to respond to, since dnsmasq at this
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point in time has no concept of vrf's and would need
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to be programmed to understand them. Help alleviate this load
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by reducing the set of data that dnsmasq pays attention to
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when we know there are events that are not useful at this
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point in time.
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Signed-off-by: Donald Sharp <donaldsharp72@gmail.com>
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(cherry picked from commit b2ed691eb3ca6488a8878f5f3dd950a07b14a9db)
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---
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src/netlink.c | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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diff --git a/src/netlink.c b/src/netlink.c
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index 8cd51af..0a3da3e 100644
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--- a/src/netlink.c
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+++ b/src/netlink.c
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@@ -363,7 +363,9 @@ static void nl_async(struct nlmsghdr *h)
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failing. */
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struct rtmsg *rtm = NLMSG_DATA(h);
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- if (rtm->rtm_type == RTN_UNICAST && rtm->rtm_scope == RT_SCOPE_LINK)
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+ if (rtm->rtm_type == RTN_UNICAST && rtm->rtm_scope == RT_SCOPE_LINK &&
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+ (rtm->rtm_table == RT_TABLE_MAIN ||
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+ rtm->rtm_table == RT_TABLE_LOCAL))
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queue_event(EVENT_NEWROUTE);
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}
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else if (h->nlmsg_type == RTM_NEWADDR || h->nlmsg_type == RTM_DELADDR)
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--
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2.26.2
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