Blame SOURCES/0005-igmp-trusted-query.patch
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From ff4516227cc48b3175106a419f43b8fc9eee3710 Mon Sep 17 00:00:00 2001
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From: Donald Sharp <sharpd@cumulusnetworks.com>
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Date: Tue, 25 Jun 2019 00:30:11 -0400
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Subject: [PATCH] pimd: Dissallow query to be received from a non-connected
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source
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When we receive an igmp query on a interface, ensure that the
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source address of the packet is connected to the incoming
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interface. This will prevent a meanie from crafting a igmp
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packet with a source address less than ours and causing
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us to suspend query activities.
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Fixes: #1692
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Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
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---
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pimd/pim_igmp.c | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/pimd/pim_igmp.c b/pimd/pim_igmp.c
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index 270f1e3f27..5beabbd8df 100644
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--- a/pimd/pim_igmp.c
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+++ b/pimd/pim_igmp.c
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@@ -305,6 +305,13 @@ static int igmp_recv_query(struct igmp_sock *igmp, int query_version,
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return -1;
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}
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+ if (!pim_if_connected_to_source(ifp, from)) {
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+ if (PIM_DEBUG_IGMP_PACKETS)
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+ zlog_debug("Recv IGMP query on interface: %s from a non-connected source: %s",
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+ ifp->name, from_str);
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+ return 0;
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+ }
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+
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/* Collecting IGMP Rx stats */
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switch (query_version) {
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case 1:
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