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/*

 *      Linux NET3:     IP/IP protocol decoder.

 *

 *      Authors:

 *              Sam Lantinga (slouken@cs.ucdavis.edu)  02/01/95

 *

 *      Fixes:

 *              Alan Cox        :       Merged and made usable non modular (its so tiny its silly as

 *                                      a module taking up 2 pages).

 *              Alan Cox        :       Fixed bug with 1.3.18 and IPIP not working (now needs to set skb->h.iph)

 *                                      to keep ip_forward happy.

 *              Alan Cox        :       More fixes for 1.3.21, and firewall fix. Maybe this will work soon 8).

 *              Kai Schulte     :       Fixed #defines for IP_FIREWALL->FIREWALL

 *

 *      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/sched.h>

#include <linux/kernel.h>

#include <linux/skbuff.h>

#include <linux/netdevice.h>

#include <linux/in.h>

#include <linux/tcp.h>

#include <linux/udp.h>

#include <linux/firewall.h>

#include <net/datalink.h>

#include <net/sock.h>

#include <net/ip.h>

#include <net/icmp.h>

#include <net/protocol.h>

#include <net/ipip.h>

/*

 *      The IPIP protocol driver.

 *

 *      On entry here

 *              skb->data is the original IP header

 *              skb->ip_hdr points to the initial IP header.

 *              skb->h.raw points at the new header.

 */

int ipip_rcv(struct sk_buff *skb, struct device *dev, struct options *opt,

                __u32 daddr, unsigned short len, __u32 saddr,

                                   int redo, struct inet_protocol *protocol)

{

        /* Don't unlink in the middle of a turnaround */

        MOD_INC_USE_COUNT;

#ifdef TUNNEL_DEBUG

        printk("ipip_rcv: got a packet!\n");

#endif

        /*

         *      Discard the original IP header

         */

        skb->mac.raw = skb->data;

        skb_pull(skb, ((struct iphdr *)skb->data)->ihl<<2);

        /*

         *      Adjust pointers

         */

        skb->h.iph=(struct iphdr *)skb->data;

        skb->ip_hdr=(struct iphdr *)skb->data;

        memset(skb->proto_priv, 0, sizeof(struct options));

        /*

         *      If you want to add LZ compressed IP or things like that here,

         *      and in drivers/net/tunnel.c are the places to add.

         */

        skb->protocol = htons(ETH_P_IP);

        skb->ip_summed = 0;

        netif_rx(skb);

        MOD_DEC_USE_COUNT;

        return(0);

}

#ifdef MODULE

static struct inet_protocol ipip_protocol = {

  ipip_rcv,             /* IPIP handler          */

#if 0

  NULL,                 /* Will be UDP fraglist handler */

#endif

  NULL,                 /* TUNNEL error control    */

  0,                    /* next                 */

  IPPROTO_IPIP,         /* protocol ID          */

  0,                    /* copy                 */

  NULL,                 /* data                 */

  "IPIP"                /* name                 */

};

/*

 *      And now the modules code and kernel interface.

 */

int init_module( void)

{

        inet_add_protocol(&ipip_protocol);

        return 0;

}

void cleanup_module( void)

{

        if ( inet_del_protocol(&ipip_protocol) < 0 )

                printk(KERN_INFO "ipip close: can't remove protocol\n");

}

#endif