| Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame^] | 1 | /* |
| 2 | * Generic HDLC support routines for Linux |
| 3 | * HDLC support |
| 4 | * |
| 5 | * Copyright (C) 1999 - 2006 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/errno.h> |
| 13 | #include <linux/hdlc.h> |
| 14 | #include <linux/if_arp.h> |
| 15 | #include <linux/inetdevice.h> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/kernel.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/pkt_sched.h> |
| 20 | #include <linux/poll.h> |
| 21 | #include <linux/rtnetlink.h> |
| 22 | #include <linux/skbuff.h> |
| 23 | |
| 24 | |
| 25 | static int raw_ioctl(struct net_device *dev, struct ifreq *ifr); |
| 26 | |
| 27 | static __be16 raw_type_trans(struct sk_buff *skb, struct net_device *dev) |
| 28 | { |
| 29 | return cpu_to_be16(ETH_P_IP); |
| 30 | } |
| 31 | |
| 32 | static struct hdlc_proto proto = { |
| 33 | .type_trans = raw_type_trans, |
| 34 | .ioctl = raw_ioctl, |
| 35 | .module = THIS_MODULE, |
| 36 | }; |
| 37 | |
| 38 | |
| 39 | static int raw_ioctl(struct net_device *dev, struct ifreq *ifr) |
| 40 | { |
| 41 | raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc; |
| 42 | const size_t size = sizeof(raw_hdlc_proto); |
| 43 | raw_hdlc_proto new_settings; |
| 44 | hdlc_device *hdlc = dev_to_hdlc(dev); |
| 45 | int result; |
| 46 | |
| 47 | switch (ifr->ifr_settings.type) { |
| 48 | case IF_GET_PROTO: |
| 49 | if (dev_to_hdlc(dev)->proto != &proto) |
| 50 | return -EINVAL; |
| 51 | ifr->ifr_settings.type = IF_PROTO_HDLC; |
| 52 | if (ifr->ifr_settings.size < size) { |
| 53 | ifr->ifr_settings.size = size; /* data size wanted */ |
| 54 | return -ENOBUFS; |
| 55 | } |
| 56 | if (copy_to_user(raw_s, hdlc->state, size)) |
| 57 | return -EFAULT; |
| 58 | return 0; |
| 59 | |
| 60 | case IF_PROTO_HDLC: |
| 61 | if (!capable(CAP_NET_ADMIN)) |
| 62 | return -EPERM; |
| 63 | |
| 64 | if (dev->flags & IFF_UP) |
| 65 | return -EBUSY; |
| 66 | |
| 67 | if (copy_from_user(&new_settings, raw_s, size)) |
| 68 | return -EFAULT; |
| 69 | |
| 70 | if (new_settings.encoding == ENCODING_DEFAULT) |
| 71 | new_settings.encoding = ENCODING_NRZ; |
| 72 | |
| 73 | if (new_settings.parity == PARITY_DEFAULT) |
| 74 | new_settings.parity = PARITY_CRC16_PR1_CCITT; |
| 75 | |
| 76 | result = hdlc->attach(dev, new_settings.encoding, |
| 77 | new_settings.parity); |
| 78 | if (result) |
| 79 | return result; |
| 80 | |
| 81 | result = attach_hdlc_protocol(dev, &proto, |
| 82 | sizeof(raw_hdlc_proto)); |
| 83 | if (result) |
| 84 | return result; |
| 85 | memcpy(hdlc->state, &new_settings, size); |
| 86 | dev->type = ARPHRD_RAWHDLC; |
| 87 | netif_dormant_off(dev); |
| 88 | return 0; |
| 89 | } |
| 90 | |
| 91 | return -EINVAL; |
| 92 | } |
| 93 | |
| 94 | |
| 95 | static int __init mod_init(void) |
| 96 | { |
| 97 | register_hdlc_protocol(&proto); |
| 98 | return 0; |
| 99 | } |
| 100 | |
| 101 | |
| 102 | |
| 103 | static void __exit mod_exit(void) |
| 104 | { |
| 105 | unregister_hdlc_protocol(&proto); |
| 106 | } |
| 107 | |
| 108 | |
| 109 | module_init(mod_init); |
| 110 | module_exit(mod_exit); |
| 111 | |
| 112 | MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); |
| 113 | MODULE_DESCRIPTION("Raw HDLC protocol support for generic HDLC"); |
| 114 | MODULE_LICENSE("GPL v2"); |