| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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 | } |