From 3d9ef354abb78f7e3544fab87f8d721071cdf4e1 Mon Sep 17 00:00:00 2001
From: Radostin Stoyanov <rstoyanov@fedoraproject.org>
Date: Fri, 16 May 2025 12:43:14 +0100
Subject: [PATCH] sk-inet: add MPTCP definition

Building CRIU on Ubuntu 20.04 fails with the following error:

criu/sk-inet.c: In function 'can_dump_ipproto':
criu/sk-inet.c:131:16: error: 'IPPROTO_MPTCP' undeclared (first use in this function); did you mean 'IPPROTO_MTP'?
  131 |   if (proto == IPPROTO_MPTCP)
      |                ^~~~~~~~~~~~~
      |                IPPROTO_MTP

Add definition for MPTCP to fix this error.

Signed-off-by: Radostin Stoyanov <rstoyanov@fedoraproject.org>
---
 criu/sk-inet.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/criu/sk-inet.c b/criu/sk-inet.c
index a191e78c4..1238b03dc 100644
--- a/criu/sk-inet.c
+++ b/criu/sk-inet.c
@@ -44,6 +44,11 @@
 #define PB_ALEN_INET  1
 #define PB_ALEN_INET6 4
 
+/* Definition for older kernels without MPTCP support (e.g. Ubuntu 20.04) */
+#ifndef IPPROTO_MPTCP
+#define IPPROTO_MPTCP 262
+#endif
+
 static LIST_HEAD(inet_ports);
 
 struct inet_port {