projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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 | ||
| ab611487 | 69 | static __be16 ppp_type_trans(struct sk_buff *skb, struct net_device *dev) |
| 1da177e4 LT |
70 | { |
| 71 | return __constant_htons(ETH_P_WAN_PPP); | |
| 72 | } | |
| 73 | ||
| 74 | ||
| 75 | ||
| 76 | int hdlc_ppp_ioctl(struct net_device *dev, struct ifreq *ifr) | |
| 77 | { | |
| 78 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
| 79 | int result; | |
| 80 | ||
| 81 | switch (ifr->ifr_settings.type) { | |
| 82 | case IF_GET_PROTO: | |
| 83 | ifr->ifr_settings.type = IF_PROTO_PPP; | |
| 84 | return 0; /* return protocol only, no settable parameters */ | |
| 85 | ||
| 86 | case IF_PROTO_PPP: | |
| 87 | if(!capable(CAP_NET_ADMIN)) | |
| 88 | return -EPERM; | |
| 89 | ||
| 90 | if(dev->flags & IFF_UP) | |
| 91 | return -EBUSY; | |
| 92 | ||
| 93 | /* no settable parameters */ | |
| 94 | ||
| 95 | result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT); | |
| 96 | if (result) | |
| 97 | return result; | |
| 98 | ||
| 99 | hdlc_proto_detach(hdlc); | |
| 100 | memset(&hdlc->proto, 0, sizeof(hdlc->proto)); | |
| 101 | ||
| 102 | hdlc->proto.open = ppp_open; | |
| 103 | hdlc->proto.close = ppp_close; | |
| 104 | hdlc->proto.type_trans = ppp_type_trans; | |
| 105 | hdlc->proto.id = IF_PROTO_PPP; | |
| 106 | dev->hard_start_xmit = hdlc->xmit; | |
| 107 | dev->hard_header = NULL; | |
| 108 | dev->type = ARPHRD_PPP; | |
| 109 | dev->addr_len = 0; | |
| 110 | return 0; | |
| 111 | } | |
| 112 | ||
| 113 | return -EINVAL; | |
| 114 | } |