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 __be16 raw_type_trans(struct sk_buff *skb, struct net_device *dev) 28 { 29 return __constant_htons(ETH_P_IP); 30 } 31 32 33 34 int hdlc_raw_ioctl(struct net_device *dev, struct ifreq *ifr) 35 { 36 raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc; 37 const size_t size = sizeof(raw_hdlc_proto); 38 raw_hdlc_proto new_settings; 39 hdlc_device *hdlc = dev_to_hdlc(dev); 40 int result; 41 42 switch (ifr->ifr_settings.type) { 43 case IF_GET_PROTO: 44 ifr->ifr_settings.type = IF_PROTO_HDLC; 45 if (ifr->ifr_settings.size < size) { 46 ifr->ifr_settings.size = size; /* data size wanted */ 47 return -ENOBUFS; 48 } 49 if (copy_to_user(raw_s, &hdlc->state.raw_hdlc.settings, size)) 50 return -EFAULT; 51 return 0; 52 53 case IF_PROTO_HDLC: 54 if (!capable(CAP_NET_ADMIN)) 55 return -EPERM; 56 57 if (dev->flags & IFF_UP) 58 return -EBUSY; 59 60 if (copy_from_user(&new_settings, raw_s, size)) 61 return -EFAULT; 62 63 if (new_settings.encoding == ENCODING_DEFAULT) 64 new_settings.encoding = ENCODING_NRZ; 65 66 if (new_settings.parity == PARITY_DEFAULT) 67 new_settings.parity = PARITY_CRC16_PR1_CCITT; 68 69 result = hdlc->attach(dev, new_settings.encoding, 70 new_settings.parity); 71 if (result) 72 return result; 73 74 hdlc_proto_detach(hdlc); 75 memcpy(&hdlc->state.raw_hdlc.settings, &new_settings, size); 76 memset(&hdlc->proto, 0, sizeof(hdlc->proto)); 77 78 hdlc->proto.type_trans = raw_type_trans; 79 hdlc->proto.id = IF_PROTO_HDLC; 80 dev->hard_start_xmit = hdlc->xmit; 81 dev->hard_header = NULL; 82 dev->type = ARPHRD_RAWHDLC; 83 dev->flags = IFF_POINTOPOINT | IFF_NOARP; 84 dev->addr_len = 0; 85 return 0; 86 } 87 88 return -EINVAL; 89 } 90