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/*

 * 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.

 *

 *              Ethernet-type device handling.

 *

 * Version:     @(#)eth.c       1.0.7   05/25/93

 *

 * 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>

 *

 * Fixes:

 *              Mr Linux        : Arp problems

 *              Alan Cox        : Generic queue tidyup (very tiny here)

 *              Alan Cox        : eth_header ntohs should be htons

 *              Alan Cox        : eth_rebuild_header missing an htons and

 *                                minor other things.

 *              Tegge           : Arp bug fixes.

 *              Florian         : Removed many unnecessary functions, code cleanup

 *                                and changes for new arp and skbuff.

 *              Alan Cox        : Redid header building to reflect new format.

 *              Alan Cox        : ARP only when compiled with CONFIG_INET

 *              Greg Page       : 802.2 and SNAP stuff.

 *              Alan Cox        : MAC layer pointers/new format.

 *              Paul Gortmaker  : eth_copy_and_sum shouldn't csum padding.

 *              Alan Cox        : Protect against forwarding explosions with

 *                                older network drivers and IFF_ALLMULTI.

 *      Christer Weinigel       : Better rebuild header message.

 *             Andrew Morton    : 26Feb01: kill ether_setup() - use netdev_boot_setup().

 *

 *              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/ip.h>

#include <linux/netdevice.h>

#include <linux/etherdevice.h>

#include <linux/skbuff.h>

#include <linux/errno.h>

#include <linux/init.h>

#include <linux/if_ether.h>

#include <net/dst.h>

#include <net/arp.h>

#include <net/sock.h>

#include <net/ipv6.h>

#include <net/ip.h>

#include <asm/uaccess.h>

#include <asm/system.h>

__setup("ether=", netdev_boot_setup);

/**

 * eth_header - create the Ethernet header

 * @skb:        buffer to alter

 * @dev:        source device

 * @type:       Ethernet type field

 * @daddr: destination address (NULL leave destination address)

 * @saddr: source address (NULL use device source address)

 * @len:   packet length (<= skb->len)

 *

 *

 * Set the protocol type. For a packet of type ETH_P_802_3 we put the length

 * in here instead. It is up to the 802.2 layer to carry protocol information.

 */

int eth_header(struct sk_buff *skb, struct net_device *dev,

               unsigned short type,

               const void *daddr, const void *saddr, unsigned len)

{

        struct ethhdr *eth = (struct ethhdr *)skb_push(skb, ETH_HLEN);

        if (type != ETH_P_802_3)

                eth->h_proto = htons(type);

        else

                eth->h_proto = htons(len);

        /*

         *      Set the source hardware address.

         */

        if (!saddr)

                saddr = dev->dev_addr;

        memcpy(eth->h_source, saddr, ETH_ALEN);

        if (daddr) {

                memcpy(eth->h_dest, daddr, ETH_ALEN);

                return ETH_HLEN;

        }

        /*

         *      Anyway, the loopback-device should never use this function...

         */

        if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) {

                memset(eth->h_dest, 0, ETH_ALEN);

                return ETH_HLEN;

        }

        return -ETH_HLEN;

}

EXPORT_SYMBOL(eth_header);

/**

 * eth_rebuild_header- rebuild the Ethernet MAC header.

 * @skb: socket buffer to update

 *

 * This is called after an ARP or IPV6 ndisc it's resolution on this

 * sk_buff. We now let protocol (ARP) fill in the other fields.

 *

 * This routine CANNOT use cached dst->neigh!

 * Really, it is used only when dst->neigh is wrong.

 */

int eth_rebuild_header(struct sk_buff *skb)

{

        struct ethhdr *eth = (struct ethhdr *)skb->data;

        struct net_device *dev = skb->dev;

        switch (eth->h_proto) {

#ifdef CONFIG_INET

        case __constant_htons(ETH_P_IP):

                return arp_find(eth->h_dest, skb);

#endif

        default:

                printk(KERN_DEBUG

                       "%s: unable to resolve type %X addresses.\n",

                       dev->name, (int)eth->h_proto);

                memcpy(eth->h_source, dev->dev_addr, ETH_ALEN);

                break;

        }

        return 0;

}

EXPORT_SYMBOL(eth_rebuild_header);

/**

 * eth_type_trans - determine the packet's protocol ID.

 * @skb: received socket data

 * @dev: receiving network device

 *

 * The rule here is that we

 * assume 802.3 if the type field is short enough to be a length.

 * This is normal practice and works for any 'now in use' protocol.

 */

__be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)

{

        struct ethhdr *eth;

        unsigned char *rawp;

        skb->dev = dev;

        skb_reset_mac_header(skb);

        skb_pull(skb, ETH_HLEN);

        eth = eth_hdr(skb);

        if (is_multicast_ether_addr(eth->h_dest)) {

                if (!compare_ether_addr(eth->h_dest, dev->broadcast))

                        skb->pkt_type = PACKET_BROADCAST;

                else

                        skb->pkt_type = PACKET_MULTICAST;

        }

        /*

         *      This ALLMULTI check should be redundant by 1.4

         *      so don't forget to remove it.

         *

         *      Seems, you forgot to remove it. All silly devices

         *      seems to set IFF_PROMISC.

         */

        else if (1 /*dev->flags&IFF_PROMISC */ ) {

                if (unlikely(compare_ether_addr(eth->h_dest, dev->dev_addr)))

                        skb->pkt_type = PACKET_OTHERHOST;

        }

        if (ntohs(eth->h_proto) >= 1536)

                return eth->h_proto;

        rawp = skb->data;

        /*

         *      This is a magic hack to spot IPX packets. Older Novell breaks

         *      the protocol design and runs IPX over 802.3 without an 802.2 LLC

         *      layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This

         *      won't work for fault tolerant netware but does for the rest.

         */

        if (*(unsigned short *)rawp == 0xFFFF)

                return htons(ETH_P_802_3);

        /*

         *      Real 802.2 LLC

         */

        return htons(ETH_P_802_2);

}

EXPORT_SYMBOL(eth_type_trans);

/**

 * eth_header_parse - extract hardware address from packet

 * @skb: packet to extract header from

 * @haddr: destination buffer

 */

int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr)

{

        const struct ethhdr *eth = eth_hdr(skb);

        memcpy(haddr, eth->h_source, ETH_ALEN);

        return ETH_ALEN;

}

EXPORT_SYMBOL(eth_header_parse);

/**

 * eth_header_cache - fill cache entry from neighbour

 * @neigh: source neighbour

 * @hh: destination cache entry

 * Create an Ethernet header template from the neighbour.

 */

int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh)

{

        __be16 type = hh->hh_type;

        struct ethhdr *eth;

        const struct net_device *dev = neigh->dev;

        eth = (struct ethhdr *)

            (((u8 *) hh->hh_data) + (HH_DATA_OFF(sizeof(*eth))));

        if (type == htons(ETH_P_802_3))

                return -1;

        eth->h_proto = type;

        memcpy(eth->h_source, dev->dev_addr, ETH_ALEN);

        memcpy(eth->h_dest, neigh->ha, ETH_ALEN);

        hh->hh_len = ETH_HLEN;

        return 0;

}

EXPORT_SYMBOL(eth_header_cache);

/**

 * eth_header_cache_update - update cache entry

 * @hh: destination cache entry

 * @dev: network device

 * @haddr: new hardware address

 *

 * Called by Address Resolution module to notify changes in address.

 */

void eth_header_cache_update(struct hh_cache *hh,

                             const struct net_device *dev,

                             const unsigned char *haddr)

{

        memcpy(((u8 *) hh->hh_data) + HH_DATA_OFF(sizeof(struct ethhdr)),

               haddr, ETH_ALEN);

}

EXPORT_SYMBOL(eth_header_cache_update);

/**

 * eth_mac_addr - set new Ethernet hardware address

 * @dev: network device

 * @p: socket address

 * Change hardware address of device.

 *

 * This doesn't change hardware matching, so needs to be overridden

 * for most real devices.

 */

static int eth_mac_addr(struct net_device *dev, void *p)

{

        struct sockaddr *addr = p;

        if (netif_running(dev))

                return -EBUSY;

        if (!is_valid_ether_addr(addr->sa_data))

                return -EADDRNOTAVAIL;

        memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);

        return 0;

}

/**

 * eth_change_mtu - set new MTU size

 * @dev: network device

 * @new_mtu: new Maximum Transfer Unit

 *

 * Allow changing MTU size. Needs to be overridden for devices

 * supporting jumbo frames.

 */

static int eth_change_mtu(struct net_device *dev, int new_mtu)

{

        if (new_mtu < 68 || new_mtu > ETH_DATA_LEN)

                return -EINVAL;

        dev->mtu = new_mtu;

        return 0;

}

static int eth_validate_addr(struct net_device *dev)

{

        if (!is_valid_ether_addr(dev->dev_addr))

                return -EINVAL;

        return 0;

}

const struct header_ops eth_header_ops ____cacheline_aligned = {

        .create         = eth_header,

        .parse          = eth_header_parse,

        .rebuild        = eth_rebuild_header,

        .cache          = eth_header_cache,

        .cache_update   = eth_header_cache_update,

};

/**

 * ether_setup - setup Ethernet network device

 * @dev: network device

 * Fill in the fields of the device structure with Ethernet-generic values.

 */

void ether_setup(struct net_device *dev)

{

        dev->header_ops         = &eth_header_ops;

        dev->change_mtu         = eth_change_mtu;

        dev->set_mac_address    = eth_mac_addr;

        dev->validate_addr      = eth_validate_addr;

        dev->type               = ARPHRD_ETHER;

        dev->hard_header_len    = ETH_HLEN;

        dev->mtu                = ETH_DATA_LEN;

        dev->addr_len           = ETH_ALEN;

        dev->tx_queue_len       = 1000; /* Ethernet wants good queues */

        dev->flags              = IFF_BROADCAST|IFF_MULTICAST;

        memset(dev->broadcast, 0xFF, ETH_ALEN);

}

EXPORT_SYMBOL(ether_setup);

/**

 * alloc_etherdev_mq - Allocates and sets up an Ethernet device

 * @sizeof_priv: Size of additional driver-private structure to be allocated

 *      for this Ethernet device

 * @queue_count: The number of queues this device has.

 *

 * Fill in the fields of the device structure with Ethernet-generic

 * values. Basically does everything except registering the device.

 *

 * 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_etherdev_mq(int sizeof_priv, unsigned int queue_count)

{

        return alloc_netdev_mq(sizeof_priv, "eth%d", ether_setup, queue_count);

}

EXPORT_SYMBOL(alloc_etherdev_mq);

char *print_mac(char *buf, const u8 *addr)

{

        sprintf(buf, MAC_FMT,

                addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);

        return buf;

}

EXPORT_SYMBOL(print_mac);