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"); 115