Subversion Repositories test_project

/*

 * 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,

                        const void *daddr, const 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 const struct header_ops hippi_header_ops = {

        .create         = hippi_header,

        .rebuild        = hippi_rebuild_header,

};

static void hippi_setup(struct net_device *dev)

{

        dev->set_multicast_list         = NULL;

        dev->change_mtu                 = hippi_change_mtu;

        dev->header_ops                 = &hippi_header_ops;

        dev->set_mac_address            = hippi_mac_addr;

        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);