1*1da177e4SLinus Torvalds /* 2*1da177e4SLinus Torvalds * Generic HDLC support routines for Linux 3*1da177e4SLinus Torvalds * Point-to-point protocol 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 int ppp_open(struct net_device *dev) 28*1da177e4SLinus Torvalds { 29*1da177e4SLinus Torvalds hdlc_device *hdlc = dev_to_hdlc(dev); 30*1da177e4SLinus Torvalds void *old_ioctl; 31*1da177e4SLinus Torvalds int result; 32*1da177e4SLinus Torvalds 33*1da177e4SLinus Torvalds dev->priv = &hdlc->state.ppp.syncppp_ptr; 34*1da177e4SLinus Torvalds hdlc->state.ppp.syncppp_ptr = &hdlc->state.ppp.pppdev; 35*1da177e4SLinus Torvalds hdlc->state.ppp.pppdev.dev = dev; 36*1da177e4SLinus Torvalds 37*1da177e4SLinus Torvalds old_ioctl = dev->do_ioctl; 38*1da177e4SLinus Torvalds hdlc->state.ppp.old_change_mtu = dev->change_mtu; 39*1da177e4SLinus Torvalds sppp_attach(&hdlc->state.ppp.pppdev); 40*1da177e4SLinus Torvalds /* sppp_attach nukes them. We don't need syncppp's ioctl */ 41*1da177e4SLinus Torvalds dev->do_ioctl = old_ioctl; 42*1da177e4SLinus Torvalds hdlc->state.ppp.pppdev.sppp.pp_flags &= ~PP_CISCO; 43*1da177e4SLinus Torvalds dev->type = ARPHRD_PPP; 44*1da177e4SLinus Torvalds result = sppp_open(dev); 45*1da177e4SLinus Torvalds if (result) { 46*1da177e4SLinus Torvalds sppp_detach(dev); 47*1da177e4SLinus Torvalds return result; 48*1da177e4SLinus Torvalds } 49*1da177e4SLinus Torvalds 50*1da177e4SLinus Torvalds return 0; 51*1da177e4SLinus Torvalds } 52*1da177e4SLinus Torvalds 53*1da177e4SLinus Torvalds 54*1da177e4SLinus Torvalds 55*1da177e4SLinus Torvalds static void ppp_close(struct net_device *dev) 56*1da177e4SLinus Torvalds { 57*1da177e4SLinus Torvalds hdlc_device *hdlc = dev_to_hdlc(dev); 58*1da177e4SLinus Torvalds 59*1da177e4SLinus Torvalds sppp_close(dev); 60*1da177e4SLinus Torvalds sppp_detach(dev); 61*1da177e4SLinus Torvalds dev->rebuild_header = NULL; 62*1da177e4SLinus Torvalds dev->change_mtu = hdlc->state.ppp.old_change_mtu; 63*1da177e4SLinus Torvalds dev->mtu = HDLC_MAX_MTU; 64*1da177e4SLinus Torvalds dev->hard_header_len = 16; 65*1da177e4SLinus Torvalds } 66*1da177e4SLinus Torvalds 67*1da177e4SLinus Torvalds 68*1da177e4SLinus Torvalds 69*1da177e4SLinus Torvalds static unsigned short ppp_type_trans(struct sk_buff *skb, 70*1da177e4SLinus Torvalds struct net_device *dev) 71*1da177e4SLinus Torvalds { 72*1da177e4SLinus Torvalds return __constant_htons(ETH_P_WAN_PPP); 73*1da177e4SLinus Torvalds } 74*1da177e4SLinus Torvalds 75*1da177e4SLinus Torvalds 76*1da177e4SLinus Torvalds 77*1da177e4SLinus Torvalds int hdlc_ppp_ioctl(struct net_device *dev, struct ifreq *ifr) 78*1da177e4SLinus Torvalds { 79*1da177e4SLinus Torvalds hdlc_device *hdlc = dev_to_hdlc(dev); 80*1da177e4SLinus Torvalds int result; 81*1da177e4SLinus Torvalds 82*1da177e4SLinus Torvalds switch (ifr->ifr_settings.type) { 83*1da177e4SLinus Torvalds case IF_GET_PROTO: 84*1da177e4SLinus Torvalds ifr->ifr_settings.type = IF_PROTO_PPP; 85*1da177e4SLinus Torvalds return 0; /* return protocol only, no settable parameters */ 86*1da177e4SLinus Torvalds 87*1da177e4SLinus Torvalds case IF_PROTO_PPP: 88*1da177e4SLinus Torvalds if(!capable(CAP_NET_ADMIN)) 89*1da177e4SLinus Torvalds return -EPERM; 90*1da177e4SLinus Torvalds 91*1da177e4SLinus Torvalds if(dev->flags & IFF_UP) 92*1da177e4SLinus Torvalds return -EBUSY; 93*1da177e4SLinus Torvalds 94*1da177e4SLinus Torvalds /* no settable parameters */ 95*1da177e4SLinus Torvalds 96*1da177e4SLinus Torvalds result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT); 97*1da177e4SLinus Torvalds if (result) 98*1da177e4SLinus Torvalds return result; 99*1da177e4SLinus Torvalds 100*1da177e4SLinus Torvalds hdlc_proto_detach(hdlc); 101*1da177e4SLinus Torvalds memset(&hdlc->proto, 0, sizeof(hdlc->proto)); 102*1da177e4SLinus Torvalds 103*1da177e4SLinus Torvalds hdlc->proto.open = ppp_open; 104*1da177e4SLinus Torvalds hdlc->proto.close = ppp_close; 105*1da177e4SLinus Torvalds hdlc->proto.type_trans = ppp_type_trans; 106*1da177e4SLinus Torvalds hdlc->proto.id = IF_PROTO_PPP; 107*1da177e4SLinus Torvalds dev->hard_start_xmit = hdlc->xmit; 108*1da177e4SLinus Torvalds dev->hard_header = NULL; 109*1da177e4SLinus Torvalds dev->type = ARPHRD_PPP; 110*1da177e4SLinus Torvalds dev->addr_len = 0; 111*1da177e4SLinus Torvalds return 0; 112*1da177e4SLinus Torvalds } 113*1da177e4SLinus Torvalds 114*1da177e4SLinus Torvalds return -EINVAL; 115*1da177e4SLinus Torvalds } 116