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 } 116