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 __constant_htons(ETH_P_IP); 31 } 32 33 34 35 static struct hdlc_proto proto = { 36 .type_trans = raw_type_trans, 37 .ioctl = raw_ioctl, 38 .module = THIS_MODULE, 39 }; 40 41 42 static int raw_ioctl(struct net_device *dev, struct ifreq *ifr) 43 { 44 raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc; 45 const size_t size = sizeof(raw_hdlc_proto); 46 raw_hdlc_proto new_settings; 47 hdlc_device *hdlc = dev_to_hdlc(dev); 48 int result; 49 50 switch (ifr->ifr_settings.type) { 51 case IF_GET_PROTO: 52 if (dev_to_hdlc(dev)->proto != &proto) 53 return -EINVAL; 54 ifr->ifr_settings.type = IF_PROTO_HDLC; 55 if (ifr->ifr_settings.size < size) { 56 ifr->ifr_settings.size = size; /* data size wanted */ 57 return -ENOBUFS; 58 } 59 if (copy_to_user(raw_s, hdlc->state, size)) 60 return -EFAULT; 61 return 0; 62 63 case IF_PROTO_HDLC: 64 if (!capable(CAP_NET_ADMIN)) 65 return -EPERM; 66 67 if (dev->flags & IFF_UP) 68 return -EBUSY; 69 70 if (copy_from_user(&new_settings, raw_s, size)) 71 return -EFAULT; 72 73 if (new_settings.encoding == ENCODING_DEFAULT) 74 new_settings.encoding = ENCODING_NRZ; 75 76 if (new_settings.parity == PARITY_DEFAULT) 77 new_settings.parity = PARITY_CRC16_PR1_CCITT; 78 79 result = hdlc->attach(dev, new_settings.encoding, 80 new_settings.parity); 81 if (result) 82 return result; 83 84 result = attach_hdlc_protocol(dev, &proto, 85 sizeof(raw_hdlc_proto)); 86 if (result) 87 return result; 88 memcpy(hdlc->state, &new_settings, size); 89 dev->hard_start_xmit = hdlc->xmit; 90 dev->type = ARPHRD_RAWHDLC; 91 netif_dormant_off(dev); 92 return 0; 93 } 94 95 return -EINVAL; 96 } 97 98 99 static int __init mod_init(void) 100 { 101 register_hdlc_protocol(&proto); 102 return 0; 103 } 104 105 106 107 static void __exit mod_exit(void) 108 { 109 unregister_hdlc_protocol(&proto); 110 } 111 112 113 module_init(mod_init); 114 module_exit(mod_exit); 115 116 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); 117 MODULE_DESCRIPTION("Raw HDLC protocol support for generic HDLC"); 118 MODULE_LICENSE("GPL v2"); 119