--- /dev/null
+From: =?utf-8?q?Zbigniew_J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
+Date: Wed, 15 Sep 2021 16:33:05 +0200
+Subject: Drop bundled copy of linux/if_arp.h
+MIME-Version: 1.0
+Content-Type: text/plain; charset="utf-8"
+Content-Transfer-Encoding: 8bit
+
+As far as I can see, we use this to get a list of ARPHRD_* defines (used in
+particular for Type= in .link files). If we drop our copy, and build against
+old kernel headers, the user will have a shorter list of types available. This
+seems OK, and I don't think it's worth carrying our own version of this file
+just to have newest possible entries.
+
+7c5b9952c4f6e2b72f90edbe439982528b7cf223 recently updated this file, but we'd
+have to update it every time the kernel adds new entries. But if we look at
+the failure carefully:
+
+src/basic/arphrd-from-name.gperf:65:16: error: ‘ARPHRD_MCTP’ undeclared (first use in this function); did you mean ‘ARPHRD_FCPP’?
+ 65 | MCTP, ARPHRD_MCTP
+ | ^~
+ | ARPHRD_FCPP
+
+we see that the list we were generating was from the system headers, so it was
+only as good as the system headers anyway, without the newer entries in our
+bundled copy, if there were any. So let's make things simpler by always using
+system headers.
+
+And if somebody wants to fix things so that we always have the newest list,
+then we should just generate and store the converted list, not the full header.
+
+(cherry picked from commit e7f46ee3ae1cc66a94b293957721d68dc09d7449)
+---
+ src/basic/linux/if_arp.h | 164 -----------------------------------------------
+ src/basic/meson.build | 1 -
+ 2 files changed, 165 deletions(-)
+ delete mode 100644 src/basic/linux/if_arp.h
+
+diff --git a/src/basic/linux/if_arp.h b/src/basic/linux/if_arp.h
+deleted file mode 100644
+index c3cc5a9..0000000
+--- a/src/basic/linux/if_arp.h
++++ /dev/null
+@@ -1,164 +0,0 @@
+-/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
+-/*
+- * INET An implementation of the TCP/IP protocol suite for the LINUX
+- * operating system. INET is implemented using the BSD Socket
+- * interface as the means of communication with the user level.
+- *
+- * Global definitions for the ARP (RFC 826) protocol.
+- *
+- * Version: @(#)if_arp.h 1.0.1 04/16/93
+- *
+- * Authors: Original taken from Berkeley UNIX 4.3, (c) UCB 1986-1988
+- * Portions taken from the KA9Q/NOS (v2.00m PA0GRI) source.
+- * Ross Biro
+- * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
+- * Florian La Roche,
+- * Jonathan Layes <layes@loran.com>
+- * Arnaldo Carvalho de Melo <acme@conectiva.com.br> ARPHRD_HWX25
+- *
+- * This program is free software; you can redistribute it and/or
+- * modify it under the terms of the GNU General Public License
+- * as published by the Free Software Foundation; either version
+- * 2 of the License, or (at your option) any later version.
+- */
+-#ifndef _UAPI_LINUX_IF_ARP_H
+-#define _UAPI_LINUX_IF_ARP_H
+-
+-#include <linux/netdevice.h>
+-
+-/* ARP protocol HARDWARE identifiers. */
+-#define ARPHRD_NETROM 0 /* from KA9Q: NET/ROM pseudo */
+-#define ARPHRD_ETHER 1 /* Ethernet 10Mbps */
+-#define ARPHRD_EETHER 2 /* Experimental Ethernet */
+-#define ARPHRD_AX25 3 /* AX.25 Level 2 */
+-#define ARPHRD_PRONET 4 /* PROnet token ring */
+-#define ARPHRD_CHAOS 5 /* Chaosnet */
+-#define ARPHRD_IEEE802 6 /* IEEE 802.2 Ethernet/TR/TB */
+-#define ARPHRD_ARCNET 7 /* ARCnet */
+-#define ARPHRD_APPLETLK 8 /* APPLEtalk */
+-#define ARPHRD_DLCI 15 /* Frame Relay DLCI */
+-#define ARPHRD_ATM 19 /* ATM */
+-#define ARPHRD_METRICOM 23 /* Metricom STRIP (new IANA id) */
+-#define ARPHRD_IEEE1394 24 /* IEEE 1394 IPv4 - RFC 2734 */
+-#define ARPHRD_EUI64 27 /* EUI-64 */
+-#define ARPHRD_INFINIBAND 32 /* InfiniBand */
+-
+-/* Dummy types for non ARP hardware */
+-#define ARPHRD_SLIP 256
+-#define ARPHRD_CSLIP 257
+-#define ARPHRD_SLIP6 258
+-#define ARPHRD_CSLIP6 259
+-#define ARPHRD_RSRVD 260 /* Notional KISS type */
+-#define ARPHRD_ADAPT 264
+-#define ARPHRD_ROSE 270
+-#define ARPHRD_X25 271 /* CCITT X.25 */
+-#define ARPHRD_HWX25 272 /* Boards with X.25 in firmware */
+-#define ARPHRD_CAN 280 /* Controller Area Network */
+-#define ARPHRD_PPP 512
+-#define ARPHRD_CISCO 513 /* Cisco HDLC */
+-#define ARPHRD_HDLC ARPHRD_CISCO
+-#define ARPHRD_LAPB 516 /* LAPB */
+-#define ARPHRD_DDCMP 517 /* Digital's DDCMP protocol */
+-#define ARPHRD_RAWHDLC 518 /* Raw HDLC */
+-#define ARPHRD_RAWIP 519 /* Raw IP */
+-
+-#define ARPHRD_TUNNEL 768 /* IPIP tunnel */
+-#define ARPHRD_TUNNEL6 769 /* IP6IP6 tunnel */
+-#define ARPHRD_FRAD 770 /* Frame Relay Access Device */
+-#define ARPHRD_SKIP 771 /* SKIP vif */
+-#define ARPHRD_LOOPBACK 772 /* Loopback device */
+-#define ARPHRD_LOCALTLK 773 /* Localtalk device */
+-#define ARPHRD_FDDI 774 /* Fiber Distributed Data Interface */
+-#define ARPHRD_BIF 775 /* AP1000 BIF */
+-#define ARPHRD_SIT 776 /* sit0 device - IPv6-in-IPv4 */
+-#define ARPHRD_IPDDP 777 /* IP over DDP tunneller */
+-#define ARPHRD_IPGRE 778 /* GRE over IP */
+-#define ARPHRD_PIMREG 779 /* PIMSM register interface */
+-#define ARPHRD_HIPPI 780 /* High Performance Parallel Interface */
+-#define ARPHRD_ASH 781 /* Nexus 64Mbps Ash */
+-#define ARPHRD_ECONET 782 /* Acorn Econet */
+-#define ARPHRD_IRDA 783 /* Linux-IrDA */
+-/* ARP works differently on different FC media .. so */
+-#define ARPHRD_FCPP 784 /* Point to point fibrechannel */
+-#define ARPHRD_FCAL 785 /* Fibrechannel arbitrated loop */
+-#define ARPHRD_FCPL 786 /* Fibrechannel public loop */
+-#define ARPHRD_FCFABRIC 787 /* Fibrechannel fabric */
+- /* 787->799 reserved for fibrechannel media types */
+-#define ARPHRD_IEEE802_TR 800 /* Magic type ident for TR */
+-#define ARPHRD_IEEE80211 801 /* IEEE 802.11 */
+-#define ARPHRD_IEEE80211_PRISM 802 /* IEEE 802.11 + Prism2 header */
+-#define ARPHRD_IEEE80211_RADIOTAP 803 /* IEEE 802.11 + radiotap header */
+-#define ARPHRD_IEEE802154 804
+-#define ARPHRD_IEEE802154_MONITOR 805 /* IEEE 802.15.4 network monitor */
+-
+-#define ARPHRD_PHONET 820 /* PhoNet media type */
+-#define ARPHRD_PHONET_PIPE 821 /* PhoNet pipe header */
+-#define ARPHRD_CAIF 822 /* CAIF media type */
+-#define ARPHRD_IP6GRE 823 /* GRE over IPv6 */
+-#define ARPHRD_NETLINK 824 /* Netlink header */
+-#define ARPHRD_6LOWPAN 825 /* IPv6 over LoWPAN */
+-#define ARPHRD_VSOCKMON 826 /* Vsock monitor header */
+-
+-#define ARPHRD_VOID 0xFFFF /* Void type, nothing is known */
+-#define ARPHRD_NONE 0xFFFE /* zero header length */
+-
+-/* ARP protocol opcodes. */
+-#define ARPOP_REQUEST 1 /* ARP request */
+-#define ARPOP_REPLY 2 /* ARP reply */
+-#define ARPOP_RREQUEST 3 /* RARP request */
+-#define ARPOP_RREPLY 4 /* RARP reply */
+-#define ARPOP_InREQUEST 8 /* InARP request */
+-#define ARPOP_InREPLY 9 /* InARP reply */
+-#define ARPOP_NAK 10 /* (ATM)ARP NAK */
+-
+-
+-/* ARP ioctl request. */
+-struct arpreq {
+- struct sockaddr arp_pa; /* protocol address */
+- struct sockaddr arp_ha; /* hardware address */
+- int arp_flags; /* flags */
+- struct sockaddr arp_netmask; /* netmask (only for proxy arps) */
+- char arp_dev[IFNAMSIZ];
+-};
+-
+-struct arpreq_old {
+- struct sockaddr arp_pa; /* protocol address */
+- struct sockaddr arp_ha; /* hardware address */
+- int arp_flags; /* flags */
+- struct sockaddr arp_netmask; /* netmask (only for proxy arps) */
+-};
+-
+-/* ARP Flag values. */
+-#define ATF_COM 0x02 /* completed entry (ha valid) */
+-#define ATF_PERM 0x04 /* permanent entry */
+-#define ATF_PUBL 0x08 /* publish entry */
+-#define ATF_USETRAILERS 0x10 /* has requested trailers */
+-#define ATF_NETMASK 0x20 /* want to use a netmask (only
+- for proxy entries) */
+-#define ATF_DONTPUB 0x40 /* don't answer this addresses */
+-
+-/*
+- * This structure defines an ethernet arp header.
+- */
+-
+-struct arphdr {
+- __be16 ar_hrd; /* format of hardware address */
+- __be16 ar_pro; /* format of protocol address */
+- unsigned char ar_hln; /* length of hardware address */
+- unsigned char ar_pln; /* length of protocol address */
+- __be16 ar_op; /* ARP opcode (command) */
+-
+-#if 0
+- /*
+- * Ethernet looks like this : This bit is variable sized however...
+- */
+- unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
+- unsigned char ar_sip[4]; /* sender IP address */
+- unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
+- unsigned char ar_tip[4]; /* target IP address */
+-#endif
+-
+-};
+-
+-
+-#endif /* _UAPI_LINUX_IF_ARP_H */
+diff --git a/src/basic/meson.build b/src/basic/meson.build
+index 1183ea8..2c13cf4 100644
+--- a/src/basic/meson.build
++++ b/src/basic/meson.build
+@@ -98,7 +98,6 @@ basic_sources = files('''
+ linux/hdlc/ioctl.h
+ linux/if.h
+ linux/if_addr.h
+- linux/if_arp.h
+ linux/if_bonding.h
+ linux/if_bridge.h
+ linux/if_ether.h
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