LXR linux/drivers/net/wan/hdlc

   1/*
   2 * Generic HDLC support routines for Linux
   3 * HDLC support
   4 *
   5 * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
   6 *
   7 * This program is free software; you can redistribute it and/or modify it
   8 * under the terms of version 2 of the GNU General Public License
   9 * as published by the Free Software Foundation.
  10 */
  11
  12#include <linux/errno.h>
  13#include <linux/hdlc.h>
  14#include <linux/if_arp.h>
  15#include <linux/inetdevice.h>
  16#include <linux/init.h>
  17#include <linux/kernel.h>
  18#include <linux/module.h>
  19#include <linux/pkt_sched.h>
  20#include <linux/poll.h>
  21#include <linux/rtnetlink.h>
  22#include <linux/skbuff.h>
  23
  24
  25static int raw_ioctl(struct net_device *dev, struct ifreq *ifr);
  26
  27static __be16 raw_type_trans(struct sk_buff *skb, struct net_device *dev)
  28{
  29        return cpu_to_be16(ETH_P_IP);
  30}
  31
  32static struct hdlc_proto proto = {
  33        .type_trans     = raw_type_trans,
  34        .ioctl          = raw_ioctl,
  35        .module         = THIS_MODULE,
  36};
  37
  38
  39static int raw_ioctl(struct net_device *dev, struct ifreq *ifr)
  40{
  41        raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc;
  42        const size_t size = sizeof(raw_hdlc_proto);
  43        raw_hdlc_proto new_settings;
  44        hdlc_device *hdlc = dev_to_hdlc(dev);
  45        int result;
  46
  47        switch (ifr->ifr_settings.type) {
  48        case IF_GET_PROTO:
  49                if (dev_to_hdlc(dev)->proto != &proto)
  50                        return -EINVAL;
  51                ifr->ifr_settings.type = IF_PROTO_HDLC;
  52                if (ifr->ifr_settings.size < size) {
  53                        ifr->ifr_settings.size = size; /* data size wanted */
  54                        return -ENOBUFS;
  55                }
  56                if (copy_to_user(raw_s, hdlc->state, size))
  57                        return -EFAULT;
  58                return 0;
  59
  60        case IF_PROTO_HDLC:
  61                if (!capable(CAP_NET_ADMIN))
  62                        return -EPERM;
  63
  64                if (dev->flags & IFF_UP)
  65                        return -EBUSY;
  66
  67                if (copy_from_user(&new_settings, raw_s, size))
  68                        return -EFAULT;
  69
  70                if (new_settings.encoding == ENCODING_DEFAULT)
  71                        new_settings.encoding = ENCODING_NRZ;
  72
  73                if (new_settings.parity == PARITY_DEFAULT)
  74                        new_settings.parity = PARITY_CRC16_PR1_CCITT;
  75
  76                result = hdlc->attach(dev, new_settings.encoding,
  77                                      new_settings.parity);
  78                if (result)
  79                        return result;
  80
  81                result = attach_hdlc_protocol(dev, &proto,
  82                                              sizeof(raw_hdlc_proto));
  83                if (result)
  84                        return result;
  85                memcpy(hdlc->state, &new_settings, size);
  86                dev->type = ARPHRD_RAWHDLC;
  87                netif_dormant_off(dev);
  88                return 0;
  89        }
  90
  91        return -EINVAL;
  92}
  93
  94
  95static int __init mod_init(void)
  96{
  97        register_hdlc_protocol(&proto);
  98        return 0;
  99}
 100
 101
 102
 103static void __exit mod_exit(void)
 104{
 105        unregister_hdlc_protocol(&proto);
 106}
 107
 108
 109module_init(mod_init);
 110module_exit(mod_exit);
 111
 112MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
 113MODULE_DESCRIPTION("Raw HDLC protocol support for generic HDLC");
 114MODULE_LICENSE("GPL v2");
 115