/* * Generic HDLC support routines for Linux * HDLC support * * Copyright (C) 1999 - 2003 Krzysztof Halasa <khc@pm.waw.pl> * * This program is free software; you can redistribute it and/or modify it * under the terms of version 2 of the GNU General Public License * as published by the Free Software Foundation. */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/slab.h> #include <linux/poll.h> #include <linux/errno.h> #include <linux/if_arp.h> #include <linux/init.h> #include <linux/skbuff.h> #include <linux/pkt_sched.h> #include <linux/inetdevice.h> #include <linux/lapb.h> #include <linux/rtnetlink.h> #include <linux/hdlc.h> static __be16 raw_type_trans(struct sk_buff *skb, struct net_device *dev) { return __constant_htons(ETH_P_IP); } int hdlc_raw_ioctl(struct net_device *dev, struct ifreq *ifr) { raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc; const size_t size = sizeof(raw_hdlc_proto); raw_hdlc_proto new_settings; hdlc_device *hdlc = dev_to_hdlc(dev); int result; switch (ifr->ifr_settings.type) { case IF_GET_PROTO: ifr->ifr_settings.type = IF_PROTO_HDLC; if (ifr->ifr_settings.size < size) { ifr->ifr_settings.size = size; /* data size wanted */ return -ENOBUFS; } if (copy_to_user(raw_s, &hdlc->state.raw_hdlc.settings, size)) return -EFAULT; return 0; case IF_PROTO_HDLC: if (!capable(CAP_NET_ADMIN)) return -EPERM; if (dev->flags & IFF_UP) return -EBUSY; if (copy_from_user(&new_settings, raw_s, size)) return -EFAULT; if (new_settings.encoding == ENCODING_DEFAULT) new_settings.encoding = ENCODING_NRZ; if (new_settings.parity == PARITY_DEFAULT) new_settings.parity = PARITY_CRC16_PR1_CCITT; result = hdlc->attach(dev, new_settings.encoding, new_settings.parity); if (result) return result; hdlc_proto_detach(hdlc); memcpy(&hdlc->state.raw_hdlc.settings, &new_settings, size); memset(&hdlc->proto, 0, sizeof(hdlc->proto)); hdlc->proto.type_trans = raw_type_trans; hdlc->proto.id = IF_PROTO_HDLC; dev->hard_start_xmit = hdlc->xmit; dev->hard_header = NULL; dev->type = ARPHRD_RAWHDLC; dev->flags = IFF_POINTOPOINT | IFF_NOARP; dev->addr_len = 0; return 0; } return -EINVAL; }