[mirror_ubuntu-focal-kernel.git] / net / 802 / hippi.c

// 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(&hip->le.reserved, 0, 16);

	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;
	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
	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);
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/*
	3	* INET An implementation of the TCP/IP protocol suite for the LINUX
	4	* operating system. INET is implemented using the BSD Socket
	5	* interface as the means of communication with the user level.
	6	*
	7	* HIPPI-type device handling.
	8	*
	9	* Version: @(#)hippi.c 1.0.0 05/29/97
	10	*
02c30a84	11	* Authors: Ross Biro
1da177e4 LT	12	* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
	13	* Mark Evans, <evansmp@uhura.aston.ac.uk>
	14	* Florian La Roche, <rzsfl@rz.uni-sb.de>
	15	* Alan Cox, <gw4pts@gw4pts.ampr.org>
	16	* Jes Sorensen, <Jes.Sorensen@cern.ch>
1da177e4 LT	17	*/
	18
	19	#include <linux/module.h>
	20	#include <linux/types.h>
	21	#include <linux/kernel.h>
1da177e4 LT	22	#include <linux/string.h>
	23	#include <linux/mm.h>
	24	#include <linux/socket.h>
	25	#include <linux/in.h>
	26	#include <linux/inet.h>
	27	#include <linux/netdevice.h>
	28	#include <linux/hippidevice.h>
	29	#include <linux/skbuff.h>
	30	#include <linux/errno.h>
	31	#include <net/arp.h>
	32	#include <net/sock.h>
7c0f6ba6	33	#include <linux/uaccess.h>
1da177e4 LT	34
1da177e4 LT	35	/*
9afa0949	36	* Create the HIPPI MAC header for an arbitrary protocol layer
1da177e4 LT	37	*
	38	* saddr=NULL means use device source address
	39	* daddr=NULL means leave destination address (eg unresolved arp)
	40	*/
	41
	42	static int hippi_header(struct sk_buff skb, struct net_device dev,
3b04ddde	43	unsigned short type,
95c96174	44	const void daddr, const void saddr, unsigned int len)
1da177e4	45	{
d58ff351	46	struct hippi_hdr *hip = skb_push(skb, HIPPI_HLEN);
6f1cf165	47	struct hippi_cb hcb = (struct hippi_cb ) skb->cb;
1da177e4 LT	48
	49	if (!len){
	50	len = skb->len - HIPPI_HLEN;
	51	printk("hippi_header(): length not supplied\n");
	52	}
	53
	54	/*
	55	* Due to the stupidity of the little endian byte-order we
	56	* have to set the fp field this way.
	57	*/
2953fd24	58	hip->fp.fixed = htonl(0x04800018);
1da177e4 LT	59	hip->fp.d2_size = htonl(len + 8);
	60	hip->le.fc = 0;
	61	hip->le.double_wide = 0; /* only HIPPI 800 for the time being */
	62	hip->le.message_type = 0; /* Data PDU */
	63
	64	hip->le.dest_addr_type = 2; /* 12 bit SC address */
	65	hip->le.src_addr_type = 2; /* 12 bit SC address */
	66
	67	memcpy(hip->le.src_switch_addr, dev->dev_addr + 3, 3);
	68	memset(&hip->le.reserved, 0, 16);
	69
	70	hip->snap.dsap = HIPPI_EXTENDED_SAP;
	71	hip->snap.ssap = HIPPI_EXTENDED_SAP;
	72	hip->snap.ctrl = HIPPI_UI_CMD;
	73	hip->snap.oui[0] = 0x00;
	74	hip->snap.oui[1] = 0x00;
	75	hip->snap.oui[2] = 0x00;
	76	hip->snap.ethertype = htons(type);
	77
	78	if (daddr)
	79	{
	80	memcpy(hip->le.dest_switch_addr, daddr + 3, 3);
6f1cf165	81	memcpy(&hcb->ifield, daddr + 2, 4);
1da177e4 LT	82	return HIPPI_HLEN;
1da177e4 LT	83	}
6f1cf165	84	hcb->ifield = 0;
1da177e4 LT	85	return -((int)HIPPI_HLEN);
	86	}
	87
	88
1da177e4 LT	89	/*
	90	* Determine the packet's protocol ID.
	91	*/
9afa0949	92
57bf1451	93	__be16 hippi_type_trans(struct sk_buff skb, struct net_device dev)
1da177e4 LT	94	{
1da177e4 LT	95	struct hippi_hdr *hip;
9afa0949	96
1da177e4 LT	97	/*
	98	* This is actually wrong ... question is if we really should
	99	* set the raw address here.
	100	*/
0a4f23fb	101	skb->dev = dev;
459a98ed	102	skb_reset_mac_header(skb);
98e399f8	103	hip = (struct hippi_hdr *)skb_mac_header(skb);
0a4f23fb	104	skb_pull(skb, HIPPI_HLEN);
1da177e4 LT	105
	106	/*
	107	* No fancy promisc stuff here now.
	108	*/
	109
	110	return hip->snap.ethertype;
	111	}
	112
	113	EXPORT_SYMBOL(hippi_type_trans);
	114
1da177e4 LT	115	/*
	116	* For HIPPI we will actually use the lower 4 bytes of the hardware
	117	* address as the I-FIELD rather than the actual hardware address.
	118	*/
748ff68f	119	int hippi_mac_addr(struct net_device dev, void p)
1da177e4 LT	120	{
	121	struct sockaddr *addr = p;
	122	if (netif_running(dev))
	123	return -EBUSY;
	124	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
	125	return 0;
	126	}
748ff68f	127	EXPORT_SYMBOL(hippi_mac_addr);
1da177e4	128
748ff68f	129	int hippi_neigh_setup_dev(struct net_device dev, struct neigh_parms p)
1da177e4 LT	130	{
1da177e4 LT	131	/* Never send broadcast/multicast ARP messages */
89740ca7	132	NEIGH_VAR_INIT(p, MCAST_PROBES, 0);
9afa0949	133
1da177e4 LT	134	/* In IPv6 unicast probes are valid even on NBMA,
1da177e4 LT	135	* because they are encapsulated in normal IPv6 protocol.
9afa0949	136	* Should be a generic flag.
1da177e4 LT	137	*/
1da177e4 LT	138	if (p->tbl->family != AF_INET6)
89740ca7	139	NEIGH_VAR_INIT(p, UCAST_PROBES, 0);
1da177e4 LT	140	return 0;
1da177e4 LT	141	}
748ff68f	142	EXPORT_SYMBOL(hippi_neigh_setup_dev);
1da177e4	143
3b04ddde SH	144	static const struct header_ops hippi_header_ops = {
3b04ddde SH	145	.create = hippi_header,
3b04ddde SH	146	};
	147
	148
1da177e4 LT	149	static void hippi_setup(struct net_device *dev)
1da177e4 LT	150	{
748ff68f	151	dev->header_ops = &hippi_header_ops;
1da177e4 LT	152
	153	/*
	154	* We don't support HIPPI `ARP' for the time being, and probably
	155	* never will unless someone else implements it. However we
	156	* still need a fake ARPHRD to make ifconfig and friends play ball.
	157	*/
	158	dev->type = ARPHRD_HIPPI;
	159	dev->hard_header_len = HIPPI_HLEN;
	160	dev->mtu = 65280;
b3e3893e JW	161	dev->min_mtu = 68;
b3e3893e JW	162	dev->max_mtu = 65280;
1da177e4 LT	163	dev->addr_len = HIPPI_ALEN;
	164	dev->tx_queue_len = 25 /* 5 */;
	165	memset(dev->broadcast, 0xFF, HIPPI_ALEN);
	166
	167
	168	/*
	169	* HIPPI doesn't support broadcast+multicast and we only use
9afa0949	170	* static ARP tables. ARP is disabled by hippi_neigh_setup_dev.
1da177e4	171	*/
9afa0949	172	dev->flags = 0;
1da177e4 LT	173	}
	174
	175	/**
	176	* alloc_hippi_dev - Register HIPPI device
	177	* @sizeof_priv: Size of additional driver-private structure to be allocated
	178	* for this HIPPI device
	179	*
	180	* Fill in the fields of the device structure with HIPPI-generic values.
	181	*
	182	* Constructs a new net device, complete with a private data area of
	183	* size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
	184	* this private data area.
	185	*/
	186
	187	struct net_device *alloc_hippi_dev(int sizeof_priv)
	188	{
c835a677 TG	189	return alloc_netdev(sizeof_priv, "hip%d", NET_NAME_UNKNOWN,
c835a677 TG	190	hippi_setup);
1da177e4 LT	191	}
	192
	193	EXPORT_SYMBOL(alloc_hippi_dev);