| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Generic HDLC support routines for Linux |
| 3 | * HDLC 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 | |
| Alexey Dobriyan | ab61148 | 2005-07-12 12:08:43 -0700 | [diff] [blame^] | 27 | static __be16 raw_type_trans(struct sk_buff *skb, struct net_device *dev) |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | { |
| 29 | return __constant_htons(ETH_P_IP); |
| 30 | } |
| 31 | |
| 32 | |
| 33 | |
| 34 | int hdlc_raw_ioctl(struct net_device *dev, struct ifreq *ifr) |
| 35 | { |
| 36 | raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc; |
| 37 | const size_t size = sizeof(raw_hdlc_proto); |
| 38 | raw_hdlc_proto new_settings; |
| 39 | hdlc_device *hdlc = dev_to_hdlc(dev); |
| 40 | int result; |
| 41 | |
| 42 | switch (ifr->ifr_settings.type) { |
| 43 | case IF_GET_PROTO: |
| 44 | ifr->ifr_settings.type = IF_PROTO_HDLC; |
| 45 | if (ifr->ifr_settings.size < size) { |
| 46 | ifr->ifr_settings.size = size; /* data size wanted */ |
| 47 | return -ENOBUFS; |
| 48 | } |
| 49 | if (copy_to_user(raw_s, &hdlc->state.raw_hdlc.settings, size)) |
| 50 | return -EFAULT; |
| 51 | return 0; |
| 52 | |
| 53 | case IF_PROTO_HDLC: |
| 54 | if (!capable(CAP_NET_ADMIN)) |
| 55 | return -EPERM; |
| 56 | |
| 57 | if (dev->flags & IFF_UP) |
| 58 | return -EBUSY; |
| 59 | |
| 60 | if (copy_from_user(&new_settings, raw_s, size)) |
| 61 | return -EFAULT; |
| 62 | |
| 63 | if (new_settings.encoding == ENCODING_DEFAULT) |
| 64 | new_settings.encoding = ENCODING_NRZ; |
| 65 | |
| 66 | if (new_settings.parity == PARITY_DEFAULT) |
| 67 | new_settings.parity = PARITY_CRC16_PR1_CCITT; |
| 68 | |
| 69 | result = hdlc->attach(dev, new_settings.encoding, |
| 70 | new_settings.parity); |
| 71 | if (result) |
| 72 | return result; |
| 73 | |
| 74 | hdlc_proto_detach(hdlc); |
| 75 | memcpy(&hdlc->state.raw_hdlc.settings, &new_settings, size); |
| 76 | memset(&hdlc->proto, 0, sizeof(hdlc->proto)); |
| 77 | |
| 78 | hdlc->proto.type_trans = raw_type_trans; |
| 79 | hdlc->proto.id = IF_PROTO_HDLC; |
| 80 | dev->hard_start_xmit = hdlc->xmit; |
| 81 | dev->hard_header = NULL; |
| 82 | dev->type = ARPHRD_RAWHDLC; |
| 83 | dev->flags = IFF_POINTOPOINT | IFF_NOARP; |
| 84 | dev->addr_len = 0; |
| 85 | return 0; |
| 86 | } |
| 87 | |
| 88 | return -EINVAL; |
| 89 | } |