1*1da177e4SLinus Torvalds /* 2*1da177e4SLinus Torvalds * Generic HDLC support routines for Linux 3*1da177e4SLinus Torvalds * HDLC support 4*1da177e4SLinus Torvalds * 5*1da177e4SLinus Torvalds * Copyright (C) 1999 - 2003 Krzysztof Halasa <khc@pm.waw.pl> 6*1da177e4SLinus Torvalds * 7*1da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify it 8*1da177e4SLinus Torvalds * under the terms of version 2 of the GNU General Public License 9*1da177e4SLinus Torvalds * as published by the Free Software Foundation. 10*1da177e4SLinus Torvalds */ 11*1da177e4SLinus Torvalds 12*1da177e4SLinus Torvalds #include <linux/module.h> 13*1da177e4SLinus Torvalds #include <linux/kernel.h> 14*1da177e4SLinus Torvalds #include <linux/slab.h> 15*1da177e4SLinus Torvalds #include <linux/poll.h> 16*1da177e4SLinus Torvalds #include <linux/errno.h> 17*1da177e4SLinus Torvalds #include <linux/if_arp.h> 18*1da177e4SLinus Torvalds #include <linux/init.h> 19*1da177e4SLinus Torvalds #include <linux/skbuff.h> 20*1da177e4SLinus Torvalds #include <linux/pkt_sched.h> 21*1da177e4SLinus Torvalds #include <linux/inetdevice.h> 22*1da177e4SLinus Torvalds #include <linux/lapb.h> 23*1da177e4SLinus Torvalds #include <linux/rtnetlink.h> 24*1da177e4SLinus Torvalds #include <linux/hdlc.h> 25*1da177e4SLinus Torvalds 26*1da177e4SLinus Torvalds 27*1da177e4SLinus Torvalds static unsigned short raw_type_trans(struct sk_buff *skb, 28*1da177e4SLinus Torvalds struct net_device *dev) 29*1da177e4SLinus Torvalds { 30*1da177e4SLinus Torvalds return __constant_htons(ETH_P_IP); 31*1da177e4SLinus Torvalds } 32*1da177e4SLinus Torvalds 33*1da177e4SLinus Torvalds 34*1da177e4SLinus Torvalds 35*1da177e4SLinus Torvalds int hdlc_raw_ioctl(struct net_device *dev, struct ifreq *ifr) 36*1da177e4SLinus Torvalds { 37*1da177e4SLinus Torvalds raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc; 38*1da177e4SLinus Torvalds const size_t size = sizeof(raw_hdlc_proto); 39*1da177e4SLinus Torvalds raw_hdlc_proto new_settings; 40*1da177e4SLinus Torvalds hdlc_device *hdlc = dev_to_hdlc(dev); 41*1da177e4SLinus Torvalds int result; 42*1da177e4SLinus Torvalds 43*1da177e4SLinus Torvalds switch (ifr->ifr_settings.type) { 44*1da177e4SLinus Torvalds case IF_GET_PROTO: 45*1da177e4SLinus Torvalds ifr->ifr_settings.type = IF_PROTO_HDLC; 46*1da177e4SLinus Torvalds if (ifr->ifr_settings.size < size) { 47*1da177e4SLinus Torvalds ifr->ifr_settings.size = size; /* data size wanted */ 48*1da177e4SLinus Torvalds return -ENOBUFS; 49*1da177e4SLinus Torvalds } 50*1da177e4SLinus Torvalds if (copy_to_user(raw_s, &hdlc->state.raw_hdlc.settings, size)) 51*1da177e4SLinus Torvalds return -EFAULT; 52*1da177e4SLinus Torvalds return 0; 53*1da177e4SLinus Torvalds 54*1da177e4SLinus Torvalds case IF_PROTO_HDLC: 55*1da177e4SLinus Torvalds if (!capable(CAP_NET_ADMIN)) 56*1da177e4SLinus Torvalds return -EPERM; 57*1da177e4SLinus Torvalds 58*1da177e4SLinus Torvalds if (dev->flags & IFF_UP) 59*1da177e4SLinus Torvalds return -EBUSY; 60*1da177e4SLinus Torvalds 61*1da177e4SLinus Torvalds if (copy_from_user(&new_settings, raw_s, size)) 62*1da177e4SLinus Torvalds return -EFAULT; 63*1da177e4SLinus Torvalds 64*1da177e4SLinus Torvalds if (new_settings.encoding == ENCODING_DEFAULT) 65*1da177e4SLinus Torvalds new_settings.encoding = ENCODING_NRZ; 66*1da177e4SLinus Torvalds 67*1da177e4SLinus Torvalds if (new_settings.parity == PARITY_DEFAULT) 68*1da177e4SLinus Torvalds new_settings.parity = PARITY_CRC16_PR1_CCITT; 69*1da177e4SLinus Torvalds 70*1da177e4SLinus Torvalds result = hdlc->attach(dev, new_settings.encoding, 71*1da177e4SLinus Torvalds new_settings.parity); 72*1da177e4SLinus Torvalds if (result) 73*1da177e4SLinus Torvalds return result; 74*1da177e4SLinus Torvalds 75*1da177e4SLinus Torvalds hdlc_proto_detach(hdlc); 76*1da177e4SLinus Torvalds memcpy(&hdlc->state.raw_hdlc.settings, &new_settings, size); 77*1da177e4SLinus Torvalds memset(&hdlc->proto, 0, sizeof(hdlc->proto)); 78*1da177e4SLinus Torvalds 79*1da177e4SLinus Torvalds hdlc->proto.type_trans = raw_type_trans; 80*1da177e4SLinus Torvalds hdlc->proto.id = IF_PROTO_HDLC; 81*1da177e4SLinus Torvalds dev->hard_start_xmit = hdlc->xmit; 82*1da177e4SLinus Torvalds dev->hard_header = NULL; 83*1da177e4SLinus Torvalds dev->type = ARPHRD_RAWHDLC; 84*1da177e4SLinus Torvalds dev->flags = IFF_POINTOPOINT | IFF_NOARP; 85*1da177e4SLinus Torvalds dev->addr_len = 0; 86*1da177e4SLinus Torvalds return 0; 87*1da177e4SLinus Torvalds } 88*1da177e4SLinus Torvalds 89*1da177e4SLinus Torvalds return -EINVAL; 90*1da177e4SLinus Torvalds } 91