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/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 27 static int raw_ioctl(struct net_device *dev, struct ifreq *ifr); 28 29 static __be16 raw_type_trans(struct sk_buff *skb, struct net_device *dev) 30 { 31 return __constant_htons(ETH_P_IP); 32 } 33 34 35 36 static struct hdlc_proto proto = { 37 .type_trans = raw_type_trans, 38 .ioctl = raw_ioctl, 39 .module = THIS_MODULE, 40 }; 41 42 43 static int raw_ioctl(struct net_device *dev, struct ifreq *ifr) 44 { 45 raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc; 46 const size_t size = sizeof(raw_hdlc_proto); 47 raw_hdlc_proto new_settings; 48 hdlc_device *hdlc = dev_to_hdlc(dev); 49 int result; 50 51 switch (ifr->ifr_settings.type) { 52 case IF_GET_PROTO: 53 if (dev_to_hdlc(dev)->proto != &proto) 54 return -EINVAL; 55 ifr->ifr_settings.type = IF_PROTO_HDLC; 56 if (ifr->ifr_settings.size < size) { 57 ifr->ifr_settings.size = size; /* data size wanted */ 58 return -ENOBUFS; 59 } 60 if (copy_to_user(raw_s, hdlc->state, size)) 61 return -EFAULT; 62 return 0; 63 64 case IF_PROTO_HDLC: 65 if (!capable(CAP_NET_ADMIN)) 66 return -EPERM; 67 68 if (dev->flags & IFF_UP) 69 return -EBUSY; 70 71 if (copy_from_user(&new_settings, raw_s, size)) 72 return -EFAULT; 73 74 if (new_settings.encoding == ENCODING_DEFAULT) 75 new_settings.encoding = ENCODING_NRZ; 76 77 if (new_settings.parity == PARITY_DEFAULT) 78 new_settings.parity = PARITY_CRC16_PR1_CCITT; 79 80 result = hdlc->attach(dev, new_settings.encoding, 81 new_settings.parity); 82 if (result) 83 return result; 84 85 result = attach_hdlc_protocol(dev, &proto, 86 sizeof(raw_hdlc_proto)); 87 if (result) 88 return result; 89 memcpy(hdlc->state, &new_settings, size); 90 dev->hard_start_xmit = hdlc->xmit; 91 dev->type = ARPHRD_RAWHDLC; 92 netif_dormant_off(dev); 93 return 0; 94 } 95 96 return -EINVAL; 97 } 98 99 100 static int __init mod_init(void) 101 { 102 register_hdlc_protocol(&proto); 103 return 0; 104 } 105 106 107 108 static void __exit mod_exit(void) 109 { 110 unregister_hdlc_protocol(&proto); 111 } 112 113 114 module_init(mod_init); 115 module_exit(mod_exit); 116 117 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); 118 MODULE_DESCRIPTION("Raw HDLC protocol support for generic HDLC"); 119 MODULE_LICENSE("GPL v2"); 120