From 5773ec3f5e64be1eb66a1e58a391cec56e3b6868 Mon Sep 17 00:00:00 2001
From: Miod Vallat <miod.vallat@powerdns.com>
Date: Mon, 16 Jun 2025 12:58:58 +0200
Subject: [PATCH] Provide an IP_OFFMASK value for systems lacking it.

Fixes: #8060

Signed-off-by: Miod Vallat <miod.vallat@powerdns.com>
---
 pdns/dnsscope.cc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pdns/dnsscope.cc b/pdns/dnsscope.cc
index 86677b2d2a..3884f81ad0 100644
--- a/pdns/dnsscope.cc
+++ b/pdns/dnsscope.cc
@@ -43,6 +43,12 @@
 #include "dnsrecords.hh"
 #include "statnode.hh"
 
+#if !defined(IP_OFFMASK)
+// Solaris and derivatives do not define IP_OFFMASK in <netinet/ip.h>.
+// We can't even use ~(IP_RF | IP_DF | IP_MF) as it doesn't define IP_RF either.
+#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
+#endif
+
 namespace po = boost::program_options;
 po::variables_map g_vm;
 
-- 
2.47.2