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 #include <linux/slab.h> 24 25 26 static int raw_ioctl(struct net_device *dev, struct ifreq *ifr); 27 28 static __be16 raw_type_trans(struct sk_buff *skb, struct net_device *dev) 29 { 30 return cpu_to_be16(ETH_P_IP); 31 } 32 33 static struct hdlc_proto proto = { 34 .type_trans = raw_type_trans, 35 .ioctl = raw_ioctl, 36 .module = THIS_MODULE, 37 }; 38 39 40 static int raw_ioctl(struct net_device *dev, struct ifreq *ifr) 41 { 42 raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc; 43 const size_t size = sizeof(raw_hdlc_proto); 44 raw_hdlc_proto new_settings; 45 hdlc_device *hdlc = dev_to_hdlc(dev); 46 int result; 47 48 switch (ifr->ifr_settings.type) { 49 case IF_GET_PROTO: 50 if (dev_to_hdlc(dev)->proto != &proto) 51 return -EINVAL; 52 ifr->ifr_settings.type = IF_PROTO_HDLC; 53 if (ifr->ifr_settings.size < size) { 54 ifr->ifr_settings.size = size; /* data size wanted */ 55 return -ENOBUFS; 56 } 57 if (copy_to_user(raw_s, hdlc->state, size)) 58 return -EFAULT; 59 return 0; 60 61 case IF_PROTO_HDLC: 62 if (!capable(CAP_NET_ADMIN)) 63 return -EPERM; 64 65 if (dev->flags & IFF_UP) 66 return -EBUSY; 67 68 if (copy_from_user(&new_settings, raw_s, size)) 69 return -EFAULT; 70 71 if (new_settings.encoding == ENCODING_DEFAULT) 72 new_settings.encoding = ENCODING_NRZ; 73 74 if (new_settings.parity == PARITY_DEFAULT) 75 new_settings.parity = PARITY_CRC16_PR1_CCITT; 76 77 result = hdlc->attach(dev, new_settings.encoding, 78 new_settings.parity); 79 if (result) 80 return result; 81 82 result = attach_hdlc_protocol(dev, &proto, 83 sizeof(raw_hdlc_proto)); 84 if (result) 85 return result; 86 memcpy(hdlc->state, &new_settings, size); 87 dev->type = ARPHRD_RAWHDLC; 88 netif_dormant_off(dev); 89 return 0; 90 } 91 92 return -EINVAL; 93 } 94 95 96 static int __init mod_init(void) 97 { 98 register_hdlc_protocol(&proto); 99 return 0; 100 } 101 102 103 104 static void __exit mod_exit(void) 105 { 106 unregister_hdlc_protocol(&proto); 107 } 108 109 110 module_init(mod_init); 111 module_exit(mod_exit); 112 113 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); 114 MODULE_DESCRIPTION("Raw HDLC protocol support for generic HDLC"); 115 MODULE_LICENSE("GPL v2"); 116