1 /* 2 * Generic HDLC support routines for Linux 3 * HDLC support 4 * 5 * Copyright (C) 1999 - 2003 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 unsigned short raw_type_trans(struct sk_buff *skb, 28 struct net_device *dev) 29 { 30 return __constant_htons(ETH_P_IP); 31 } 32 33 34 35 int hdlc_raw_ioctl(struct net_device *dev, struct ifreq *ifr) 36 { 37 raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc; 38 const size_t size = sizeof(raw_hdlc_proto); 39 raw_hdlc_proto new_settings; 40 hdlc_device *hdlc = dev_to_hdlc(dev); 41 int result; 42 43 switch (ifr->ifr_settings.type) { 44 case IF_GET_PROTO: 45 ifr->ifr_settings.type = IF_PROTO_HDLC; 46 if (ifr->ifr_settings.size < size) { 47 ifr->ifr_settings.size = size; /* data size wanted */ 48 return -ENOBUFS; 49 } 50 if (copy_to_user(raw_s, &hdlc->state.raw_hdlc.settings, size)) 51 return -EFAULT; 52 return 0; 53 54 case IF_PROTO_HDLC: 55 if (!capable(CAP_NET_ADMIN)) 56 return -EPERM; 57 58 if (dev->flags & IFF_UP) 59 return -EBUSY; 60 61 if (copy_from_user(&new_settings, raw_s, size)) 62 return -EFAULT; 63 64 if (new_settings.encoding == ENCODING_DEFAULT) 65 new_settings.encoding = ENCODING_NRZ; 66 67 if (new_settings.parity == PARITY_DEFAULT) 68 new_settings.parity = PARITY_CRC16_PR1_CCITT; 69 70 result = hdlc->attach(dev, new_settings.encoding, 71 new_settings.parity); 72 if (result) 73 return result; 74 75 hdlc_proto_detach(hdlc); 76 memcpy(&hdlc->state.raw_hdlc.settings, &new_settings, size); 77 memset(&hdlc->proto, 0, sizeof(hdlc->proto)); 78 79 hdlc->proto.type_trans = raw_type_trans; 80 hdlc->proto.id = IF_PROTO_HDLC; 81 dev->hard_start_xmit = hdlc->xmit; 82 dev->hard_header = NULL; 83 dev->type = ARPHRD_RAWHDLC; 84 dev->flags = IFF_POINTOPOINT | IFF_NOARP; 85 dev->addr_len = 0; 86 return 0; 87 } 88 89 return -EINVAL; 90 } 91