235 lines
6.0 KiB
C
235 lines
6.0 KiB
C
/*
|
|
* 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>
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#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 <asm/uaccess.h>
|
|
#include <asm/system.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, void *daddr, void *saddr,
|
|
unsigned len)
|
|
{
|
|
struct hippi_hdr *hip = (struct hippi_hdr *)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);
|
|
}
|
|
|
|
|
|
/*
|
|
* Rebuild the HIPPI MAC header. This is called after an ARP has
|
|
* completed on this sk_buff. We now let ARP fill in the other fields.
|
|
*/
|
|
|
|
static int hippi_rebuild_header(struct sk_buff *skb)
|
|
{
|
|
struct hippi_hdr *hip = (struct hippi_hdr *)skb->data;
|
|
|
|
/*
|
|
* Only IP is currently supported
|
|
*/
|
|
|
|
if(hip->snap.ethertype != htons(ETH_P_IP))
|
|
{
|
|
printk(KERN_DEBUG "%s: unable to resolve type %X addresses.\n",skb->dev->name,ntohs(hip->snap.ethertype));
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* We don't support dynamic ARP on HIPPI, but we use the ARP
|
|
* static ARP tables to hold the I-FIELDs.
|
|
*/
|
|
return arp_find(hip->le.daddr, skb);
|
|
}
|
|
|
|
|
|
/*
|
|
* 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);
|
|
|
|
static int hippi_change_mtu(struct net_device *dev, int new_mtu)
|
|
{
|
|
/*
|
|
* HIPPI's got these nice large MTUs.
|
|
*/
|
|
if ((new_mtu < 68) || (new_mtu > 65280))
|
|
return -EINVAL;
|
|
dev->mtu = new_mtu;
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* For HIPPI we will actually use the lower 4 bytes of the hardware
|
|
* address as the I-FIELD rather than the actual hardware address.
|
|
*/
|
|
static 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;
|
|
}
|
|
|
|
static int hippi_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p)
|
|
{
|
|
/* Never send broadcast/multicast ARP messages */
|
|
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)
|
|
p->ucast_probes = 0;
|
|
return 0;
|
|
}
|
|
|
|
static void hippi_setup(struct net_device *dev)
|
|
{
|
|
dev->set_multicast_list = NULL;
|
|
dev->change_mtu = hippi_change_mtu;
|
|
dev->hard_header = hippi_header;
|
|
dev->rebuild_header = hippi_rebuild_header;
|
|
dev->set_mac_address = hippi_mac_addr;
|
|
dev->hard_header_parse = NULL;
|
|
dev->hard_header_cache = NULL;
|
|
dev->header_cache_update = NULL;
|
|
dev->neigh_setup = hippi_neigh_setup_dev;
|
|
|
|
/*
|
|
* 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->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", hippi_setup);
|
|
}
|
|
|
|
EXPORT_SYMBOL(alloc_hippi_dev);
|