40 lines
1.4 KiB
Diff
40 lines
1.4 KiB
Diff
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From f3d697a84e90f31a86874e334240ee1360a2fbf8 Mon Sep 17 00:00:00 2001
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From: Jiri Popelka <jpopelka@redhat.com>
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Date: Thu, 9 Oct 2014 18:57:22 +0200
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Subject: [PATCH] Work-around for hop-limit set to 1
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---
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common/socket.c | 16 +++++++++++++++-
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1 file changed, 15 insertions(+), 1 deletion(-)
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diff --git a/common/socket.c b/common/socket.c
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index b8b44a6..93406ef 100644
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--- a/common/socket.c
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+++ b/common/socket.c
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@@ -301,7 +301,21 @@ if_register_socket(struct interface_info *info, int family,
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}
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if ((family == AF_INET6) &&
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- ((info->flags & INTERFACE_UPSTREAM) != 0)) {
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+ /*
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+ * rfc3315 says that: "If relay agent relays messages to
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+ * All_DHCP_Servers multicast address or other multicast addresses,
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+ * it sets the Hop Limit field to 32."
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+ *
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+ * Because we use the same socket for all (upper/lower)
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+ * interfaces, the hop limit is the same for both/all.
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+ * There should be INTERFACE_UPSTREAM in the below condition, but
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+ * problem is when the interface which registers the socket is
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+ * lower interface, in that case the hop limit was not set
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+ * (i.e. set to 1) for both.
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+ * Because rfc doesn't say anything about hop limit for lower,
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+ * it'd be lesser evil to have 32 in both cases.
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+ */
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+ ((info->flags & INTERFACE_STREAMS) != 0)) {
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int hop_limit = 32;
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if (setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
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&hop_limit, sizeof(int)) < 0) {
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--
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2.1.0
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