net: remove HIPPI support and RoadRunner HIPPI driver

HIPPI has not been relevant for over two decades. It was rapidly
eclipsed by Fibre Channel, and even when it was new, it was
confined to very high-end hardware. The HIPPI code has only
received tree-wide changes and fixes by inspection in the entire
Git history. Remove HIPPI support and the rrunner HIPPI driver,
and move the former maintainer to the CREDITS file. Keep the
include/uapi/linux/if_hippi.h header because it is used by the TUN
code, and to avoid breaking userspace, however unlikely that may be.

Signed-off-by: Ethan Nelson-Moore <enelsonmoore@gmail.com>
Link: https://patch.msgid.link/20260119022451.22344-1-enelsonmoore@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

2 files changed, 0 insertions, 194 deletions

diff --git a/net/802/Makefile b/net/802/Makefile
index 99abc29d537c..9503ef6b2e06 100644
--- a/net/802/Makefile
+++ b/net/802/Makefile
@@ -6,7 +6,6 @@
 obj-$(CONFIG_LLC)	+= psnap.o
 obj-$(CONFIG_NET_FC)	+=                 fc.o
 obj-$(CONFIG_FDDI)	+=                 fddi.o
-obj-$(CONFIG_HIPPI)	+=                 hippi.o
 obj-$(CONFIG_ATALK)	+= psnap.o
 obj-$(CONFIG_STP)	+= stp.o
 obj-$(CONFIG_GARP)	+= garp.o
diff --git a/net/802/hippi.c b/net/802/hippi.c
deleted file mode 100644
index 1997b7dd265e..000000000000
--- a/net/802/hippi.c
+++ /dev/null
@@ -1,193 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * 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.
- *
- *		HIPPI-type device handling.
- *
- * Version:	@(#)hippi.c	1.0.0	05/29/97
- *
- * Authors:	Ross Biro
- *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
- *		Mark Evans, <evansmp@uhura.aston.ac.uk>
- *		Florian  La Roche, <rzsfl@rz.uni-sb.de>
- *		Alan Cox, <gw4pts@gw4pts.ampr.org>
- *		Jes Sorensen, <Jes.Sorensen@cern.ch>
- */
-
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/string.h>
-#include <linux/mm.h>
-#include <linux/socket.h>
-#include <linux/in.h>
-#include <linux/inet.h>
-#include <linux/netdevice.h>
-#include <linux/hippidevice.h>
-#include <linux/skbuff.h>
-#include <linux/errno.h>
-#include <net/arp.h>
-#include <net/sock.h>
-#include <linux/uaccess.h>
-
-/*
- * Create the HIPPI MAC header for an arbitrary protocol layer
- *
- * saddr=NULL	means use device source address
- * daddr=NULL	means leave destination address (eg unresolved arp)
- */
-
-static int hippi_header(struct sk_buff *skb, struct net_device *dev,
-			unsigned short type,
-			const void *daddr, const void *saddr, unsigned int len)
-{
-	struct hippi_hdr *hip = skb_push(skb, HIPPI_HLEN);
-	struct hippi_cb *hcb = (struct hippi_cb *) skb->cb;
-
-	if (!len){
-		len = skb->len - HIPPI_HLEN;
-		printk("hippi_header(): length not supplied\n");
-	}
-
-	/*
-	 * Due to the stupidity of the little endian byte-order we
-	 * have to set the fp field this way.
-	 */
-	hip->fp.fixed		= htonl(0x04800018);
-	hip->fp.d2_size		= htonl(len + 8);
-	hip->le.fc		= 0;
-	hip->le.double_wide	= 0;	/* only HIPPI 800 for the time being */
-	hip->le.message_type	= 0;	/* Data PDU */
-
-	hip->le.dest_addr_type	= 2;	/* 12 bit SC address */
-	hip->le.src_addr_type	= 2;	/* 12 bit SC address */
-
-	memcpy(hip->le.src_switch_addr, dev->dev_addr + 3, 3);
-	memset_startat(&hip->le, 0, reserved);
-
-	hip->snap.dsap		= HIPPI_EXTENDED_SAP;
-	hip->snap.ssap		= HIPPI_EXTENDED_SAP;
-	hip->snap.ctrl		= HIPPI_UI_CMD;
-	hip->snap.oui[0]	= 0x00;
-	hip->snap.oui[1]	= 0x00;
-	hip->snap.oui[2]	= 0x00;
-	hip->snap.ethertype	= htons(type);
-
-	if (daddr)
-	{
-		memcpy(hip->le.dest_switch_addr, daddr + 3, 3);
-		memcpy(&hcb->ifield, daddr + 2, 4);
-		return HIPPI_HLEN;
-	}
-	hcb->ifield = 0;
-	return -((int)HIPPI_HLEN);
-}
-
-
-/*
- *	Determine the packet's protocol ID.
- */
-
-__be16 hippi_type_trans(struct sk_buff *skb, struct net_device *dev)
-{
-	struct hippi_hdr *hip;
-
-	/*
-	 * This is actually wrong ... question is if we really should
-	 * set the raw address here.
-	 */
-	skb->dev = dev;
-	skb_reset_mac_header(skb);
-	hip = (struct hippi_hdr *)skb_mac_header(skb);
-	skb_pull(skb, HIPPI_HLEN);
-
-	/*
-	 * No fancy promisc stuff here now.
-	 */
-
-	return hip->snap.ethertype;
-}
-
-EXPORT_SYMBOL(hippi_type_trans);
-
-/*
- * For HIPPI we will actually use the lower 4 bytes of the hardware
- * address as the I-FIELD rather than the actual hardware address.
- */
-int hippi_mac_addr(struct net_device *dev, void *p)
-{
-	struct sockaddr *addr = p;
-	if (netif_running(dev))
-		return -EBUSY;
-	dev_addr_set(dev, addr->sa_data);
-	return 0;
-}
-EXPORT_SYMBOL(hippi_mac_addr);
-
-int hippi_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p)
-{
-	/* Never send broadcast/multicast ARP messages */
-	NEIGH_VAR_INIT(p, MCAST_PROBES, 0);
-
-	/* In IPv6 unicast probes are valid even on NBMA,
-	* because they are encapsulated in normal IPv6 protocol.
-	* Should be a generic flag.
-	*/
-	if (p->tbl->family != AF_INET6)
-		NEIGH_VAR_INIT(p, UCAST_PROBES, 0);
-	return 0;
-}
-EXPORT_SYMBOL(hippi_neigh_setup_dev);
-
-static const struct header_ops hippi_header_ops = {
-	.create		= hippi_header,
-};
-
-
-static void hippi_setup(struct net_device *dev)
-{
-	dev->header_ops			= &hippi_header_ops;
-
-	/*
-	 * We don't support HIPPI `ARP' for the time being, and probably
-	 * never will unless someone else implements it. However we
-	 * still need a fake ARPHRD to make ifconfig and friends play ball.
-	 */
-	dev->type		= ARPHRD_HIPPI;
-	dev->hard_header_len 	= HIPPI_HLEN;
-	dev->mtu		= 65280;
-	dev->min_mtu		= 68;
-	dev->max_mtu		= 65280;
-	dev->addr_len		= HIPPI_ALEN;
-	dev->tx_queue_len	= 25 /* 5 */;
-	memset(dev->broadcast, 0xFF, HIPPI_ALEN);
-
-
-	/*
-	 * HIPPI doesn't support broadcast+multicast and we only use
-	 * static ARP tables. ARP is disabled by hippi_neigh_setup_dev.
-	 */
-	dev->flags = 0;
-}
-
-/**
- * alloc_hippi_dev - Register HIPPI device
- * @sizeof_priv: Size of additional driver-private structure to be allocated
- *	for this HIPPI device
- *
- * Fill in the fields of the device structure with HIPPI-generic values.
- *
- * Constructs a new net device, complete with a private data area of
- * size @sizeof_priv.  A 32-byte (not bit) alignment is enforced for
- * this private data area.
- */
-
-struct net_device *alloc_hippi_dev(int sizeof_priv)
-{
-	return alloc_netdev(sizeof_priv, "hip%d", NET_NAME_UNKNOWN,
-			    hippi_setup);
-}
-
-EXPORT_SYMBOL(alloc_hippi_dev);