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/*

 * Generic HDLC support routines for Linux

 * Point-to-point protocol support

 *

 * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of version 2 of the GNU General Public License

 * as published by the Free Software Foundation.

 */

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/slab.h>

#include <linux/poll.h>

#include <linux/errno.h>

#include <linux/if_arp.h>

#include <linux/init.h>

#include <linux/skbuff.h>

#include <linux/pkt_sched.h>

#include <linux/inetdevice.h>

#include <linux/lapb.h>

#include <linux/rtnetlink.h>

#include <linux/hdlc.h>

#include <net/syncppp.h>

struct ppp_state {

        struct ppp_device pppdev;

        struct ppp_device *syncppp_ptr;

        int (*old_change_mtu)(struct net_device *dev, int new_mtu);

};

static int ppp_ioctl(struct net_device *dev, struct ifreq *ifr);

static inline struct ppp_state* state(hdlc_device *hdlc)

{

        return(struct ppp_state *)(hdlc->state);

}

static int ppp_open(struct net_device *dev)

{

        hdlc_device *hdlc = dev_to_hdlc(dev);

        void *old_ioctl;

        int result;

        dev->priv = &state(hdlc)->syncppp_ptr;

        state(hdlc)->syncppp_ptr = &state(hdlc)->pppdev;

        state(hdlc)->pppdev.dev = dev;

        old_ioctl = dev->do_ioctl;

        state(hdlc)->old_change_mtu = dev->change_mtu;

        sppp_attach(&state(hdlc)->pppdev);

        /* sppp_attach nukes them. We don't need syncppp's ioctl */

        dev->do_ioctl = old_ioctl;

        state(hdlc)->pppdev.sppp.pp_flags &= ~PP_CISCO;

        dev->type = ARPHRD_PPP;

        result = sppp_open(dev);

        if (result) {

                sppp_detach(dev);

                return result;

        }

        return 0;

}

static void ppp_close(struct net_device *dev)

{

        hdlc_device *hdlc = dev_to_hdlc(dev);

        sppp_close(dev);

        sppp_detach(dev);

        dev->change_mtu = state(hdlc)->old_change_mtu;

        dev->mtu = HDLC_MAX_MTU;

        dev->hard_header_len = 16;

}

static __be16 ppp_type_trans(struct sk_buff *skb, struct net_device *dev)

{

        return __constant_htons(ETH_P_WAN_PPP);

}

static struct hdlc_proto proto = {

        .open           = ppp_open,

        .close          = ppp_close,

        .type_trans     = ppp_type_trans,

        .ioctl          = ppp_ioctl,

        .module         = THIS_MODULE,

};

static int ppp_ioctl(struct net_device *dev, struct ifreq *ifr)

{

        hdlc_device *hdlc = dev_to_hdlc(dev);

        int result;

        switch (ifr->ifr_settings.type) {

        case IF_GET_PROTO:

                if (dev_to_hdlc(dev)->proto != &proto)

                        return -EINVAL;

                ifr->ifr_settings.type = IF_PROTO_PPP;

                return 0; /* return protocol only, no settable parameters */

        case IF_PROTO_PPP:

                if(!capable(CAP_NET_ADMIN))

                        return -EPERM;

                if(dev->flags & IFF_UP)

                        return -EBUSY;

                /* no settable parameters */

                result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);

                if (result)

                        return result;

                result = attach_hdlc_protocol(dev, &proto, NULL,

                                              sizeof(struct ppp_state));

                if (result)

                        return result;

                dev->hard_start_xmit = hdlc->xmit;

                dev->type = ARPHRD_PPP;

                netif_dormant_off(dev);

                return 0;

        }

        return -EINVAL;

}

static int __init mod_init(void)

{

        register_hdlc_protocol(&proto);

        return 0;

}

static void __exit mod_exit(void)

{

        unregister_hdlc_protocol(&proto);

}

module_init(mod_init);

module_exit(mod_exit);

MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");

MODULE_DESCRIPTION("PPP protocol support for generic HDLC");

MODULE_LICENSE("GPL v2");