drivers/net/wan/hdlc_ppp.c

   1 /*
   2  * Generic HDLC support routines for Linux
   3  * Point-to-point protocol support
   4  *
   5  * Copyright (C) 1999 - 2003 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/module.h>
  13 #include <linux/kernel.h>
  14 #include <linux/slab.h>
  15 #include <linux/poll.h>
  16 #include <linux/errno.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/init.h>
  19 #include <linux/skbuff.h>
  20 #include <linux/pkt_sched.h>
  21 #include <linux/inetdevice.h>
  22 #include <linux/lapb.h>
  23 #include <linux/rtnetlink.h>
  24 #include <linux/hdlc.h>
  25
  26
  27 static int ppp_open(struct net_device *dev)
  28 {
  29         hdlc_device *hdlc = dev_to_hdlc(dev);
  30         void *old_ioctl;
  31         int result;
  32
  33         dev->priv = &hdlc->state.ppp.syncppp_ptr;
  34         hdlc->state.ppp.syncppp_ptr = &hdlc->state.ppp.pppdev;
  35         hdlc->state.ppp.pppdev.dev = dev;
  36
  37         old_ioctl = dev->do_ioctl;
  38         hdlc->state.ppp.old_change_mtu = dev->change_mtu;
  39         sppp_attach(&hdlc->state.ppp.pppdev);
  40         /* sppp_attach nukes them. We don't need syncppp's ioctl */
  41         dev->do_ioctl = old_ioctl;
  42         hdlc->state.ppp.pppdev.sppp.pp_flags &= ~PP_CISCO;
  43         dev->type = ARPHRD_PPP;
  44         result = sppp_open(dev);
  45         if (result) {
  46                 sppp_detach(dev);
  47                 return result;
  48         }
  49
  50         return 0;
  51 }
  52
  53
  54
  55 static void ppp_close(struct net_device *dev)
  56 {
  57         hdlc_device *hdlc = dev_to_hdlc(dev);
  58
  59         sppp_close(dev);
  60         sppp_detach(dev);
  61         dev->rebuild_header = NULL;
  62         dev->change_mtu = hdlc->state.ppp.old_change_mtu;
  63         dev->mtu = HDLC_MAX_MTU;
  64         dev->hard_header_len = 16;
  65 }
  66
  67
  68
  69 static unsigned short ppp_type_trans(struct sk_buff *skb,
  70                                      struct net_device *dev)
  71 {
  72         return __constant_htons(ETH_P_WAN_PPP);
  73 }
  74
  75
  76
  77 int hdlc_ppp_ioctl(struct net_device *dev, struct ifreq *ifr)
  78 {
  79         hdlc_device *hdlc = dev_to_hdlc(dev);
  80         int result;
  81
  82         switch (ifr->ifr_settings.type) {
  83         case IF_GET_PROTO:
  84                 ifr->ifr_settings.type = IF_PROTO_PPP;
  85                 return 0; /* return protocol only, no settable parameters */
  86
  87         case IF_PROTO_PPP:
  88                 if(!capable(CAP_NET_ADMIN))
  89                         return -EPERM;
  90
  91                 if(dev->flags & IFF_UP)
  92                         return -EBUSY;
  93
  94                 /* no settable parameters */
  95
  96                 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
  97                 if (result)
  98                         return result;
  99
 100                 hdlc_proto_detach(hdlc);
 101                 memset(&hdlc->proto, 0, sizeof(hdlc->proto));
 102
 103                 hdlc->proto.open = ppp_open;
 104                 hdlc->proto.close = ppp_close;
 105                 hdlc->proto.type_trans = ppp_type_trans;
 106                 hdlc->proto.id = IF_PROTO_PPP;
 107                 dev->hard_start_xmit = hdlc->xmit;
 108                 dev->hard_header = NULL;
 109                 dev->type = ARPHRD_PPP;
 110                 dev->addr_len = 0;
 111                 return 0;
 112         }
 113
 114         return -EINVAL;
 115 }