11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * Generic HDLC support routines for Linux 31da177e4SLinus Torvalds * HDLC Ethernet emulation support 41da177e4SLinus Torvalds * 5eb2a2fd9SKrzysztof Halasa * Copyright (C) 2002-2006 Krzysztof Halasa <khc@pm.waw.pl> 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify it 81da177e4SLinus Torvalds * under the terms of version 2 of the GNU General Public License 91da177e4SLinus Torvalds * as published by the Free Software Foundation. 101da177e4SLinus Torvalds */ 111da177e4SLinus Torvalds 121da177e4SLinus Torvalds #include <linux/module.h> 131da177e4SLinus Torvalds #include <linux/kernel.h> 141da177e4SLinus Torvalds #include <linux/slab.h> 151da177e4SLinus Torvalds #include <linux/poll.h> 161da177e4SLinus Torvalds #include <linux/errno.h> 171da177e4SLinus Torvalds #include <linux/if_arp.h> 181da177e4SLinus Torvalds #include <linux/init.h> 191da177e4SLinus Torvalds #include <linux/skbuff.h> 201da177e4SLinus Torvalds #include <linux/pkt_sched.h> 211da177e4SLinus Torvalds #include <linux/random.h> 221da177e4SLinus Torvalds #include <linux/inetdevice.h> 231da177e4SLinus Torvalds #include <linux/lapb.h> 241da177e4SLinus Torvalds #include <linux/rtnetlink.h> 251da177e4SLinus Torvalds #include <linux/etherdevice.h> 261da177e4SLinus Torvalds #include <linux/hdlc.h> 271da177e4SLinus Torvalds 28eb2a2fd9SKrzysztof Halasa static int raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr); 291da177e4SLinus Torvalds 301da177e4SLinus Torvalds static int eth_tx(struct sk_buff *skb, struct net_device *dev) 311da177e4SLinus Torvalds { 321da177e4SLinus Torvalds int pad = ETH_ZLEN - skb->len; 331da177e4SLinus Torvalds if (pad > 0) { /* Pad the frame with zeros */ 341da177e4SLinus Torvalds int len = skb->len; 351da177e4SLinus Torvalds if (skb_tailroom(skb) < pad) 361da177e4SLinus Torvalds if (pskb_expand_head(skb, 0, pad, GFP_ATOMIC)) { 371da177e4SLinus Torvalds hdlc_stats(dev)->tx_dropped++; 381da177e4SLinus Torvalds dev_kfree_skb(skb); 391da177e4SLinus Torvalds return 0; 401da177e4SLinus Torvalds } 411da177e4SLinus Torvalds skb_put(skb, pad); 421da177e4SLinus Torvalds memset(skb->data + len, 0, pad); 431da177e4SLinus Torvalds } 441da177e4SLinus Torvalds return dev_to_hdlc(dev)->xmit(skb, dev); 451da177e4SLinus Torvalds } 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds 48eb2a2fd9SKrzysztof Halasa static struct hdlc_proto proto = { 49eb2a2fd9SKrzysztof Halasa .type_trans = eth_type_trans, 50eb2a2fd9SKrzysztof Halasa .ioctl = raw_eth_ioctl, 51eb2a2fd9SKrzysztof Halasa .module = THIS_MODULE, 52eb2a2fd9SKrzysztof Halasa }; 53eb2a2fd9SKrzysztof Halasa 54eb2a2fd9SKrzysztof Halasa 55eb2a2fd9SKrzysztof Halasa static int raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr) 561da177e4SLinus Torvalds { 571da177e4SLinus Torvalds raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc; 581da177e4SLinus Torvalds const size_t size = sizeof(raw_hdlc_proto); 591da177e4SLinus Torvalds raw_hdlc_proto new_settings; 601da177e4SLinus Torvalds hdlc_device *hdlc = dev_to_hdlc(dev); 611da177e4SLinus Torvalds int result; 6290458401SAl Viro int (*old_ch_mtu)(struct net_device *, int); 631da177e4SLinus Torvalds int old_qlen; 641da177e4SLinus Torvalds 651da177e4SLinus Torvalds switch (ifr->ifr_settings.type) { 661da177e4SLinus Torvalds case IF_GET_PROTO: 67eb2a2fd9SKrzysztof Halasa if (dev_to_hdlc(dev)->proto != &proto) 68eb2a2fd9SKrzysztof Halasa return -EINVAL; 691da177e4SLinus Torvalds ifr->ifr_settings.type = IF_PROTO_HDLC_ETH; 701da177e4SLinus Torvalds if (ifr->ifr_settings.size < size) { 711da177e4SLinus Torvalds ifr->ifr_settings.size = size; /* data size wanted */ 721da177e4SLinus Torvalds return -ENOBUFS; 731da177e4SLinus Torvalds } 74eb2a2fd9SKrzysztof Halasa if (copy_to_user(raw_s, hdlc->state, size)) 751da177e4SLinus Torvalds return -EFAULT; 761da177e4SLinus Torvalds return 0; 771da177e4SLinus Torvalds 781da177e4SLinus Torvalds case IF_PROTO_HDLC_ETH: 791da177e4SLinus Torvalds if (!capable(CAP_NET_ADMIN)) 801da177e4SLinus Torvalds return -EPERM; 811da177e4SLinus Torvalds 821da177e4SLinus Torvalds if (dev->flags & IFF_UP) 831da177e4SLinus Torvalds return -EBUSY; 841da177e4SLinus Torvalds 851da177e4SLinus Torvalds if (copy_from_user(&new_settings, raw_s, size)) 861da177e4SLinus Torvalds return -EFAULT; 871da177e4SLinus Torvalds 881da177e4SLinus Torvalds if (new_settings.encoding == ENCODING_DEFAULT) 891da177e4SLinus Torvalds new_settings.encoding = ENCODING_NRZ; 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds if (new_settings.parity == PARITY_DEFAULT) 921da177e4SLinus Torvalds new_settings.parity = PARITY_CRC16_PR1_CCITT; 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds result = hdlc->attach(dev, new_settings.encoding, 951da177e4SLinus Torvalds new_settings.parity); 961da177e4SLinus Torvalds if (result) 971da177e4SLinus Torvalds return result; 981da177e4SLinus Torvalds 99eb2a2fd9SKrzysztof Halasa result = attach_hdlc_protocol(dev, &proto, NULL, 100eb2a2fd9SKrzysztof Halasa sizeof(raw_hdlc_proto)); 101eb2a2fd9SKrzysztof Halasa if (result) 102eb2a2fd9SKrzysztof Halasa return result; 103eb2a2fd9SKrzysztof Halasa memcpy(hdlc->state, &new_settings, size); 1041da177e4SLinus Torvalds dev->hard_start_xmit = eth_tx; 1051da177e4SLinus Torvalds old_ch_mtu = dev->change_mtu; 1061da177e4SLinus Torvalds old_qlen = dev->tx_queue_len; 1071da177e4SLinus Torvalds ether_setup(dev); 1081da177e4SLinus Torvalds dev->change_mtu = old_ch_mtu; 1091da177e4SLinus Torvalds dev->tx_queue_len = old_qlen; 1101da177e4SLinus Torvalds memcpy(dev->dev_addr, "\x00\x01", 2); 1111da177e4SLinus Torvalds get_random_bytes(dev->dev_addr + 2, ETH_ALEN - 2); 1124bc83b4dSKrzysztof Halasa netif_dormant_off(dev); 1131da177e4SLinus Torvalds return 0; 1141da177e4SLinus Torvalds } 1151da177e4SLinus Torvalds 1161da177e4SLinus Torvalds return -EINVAL; 1171da177e4SLinus Torvalds } 118eb2a2fd9SKrzysztof Halasa 119eb2a2fd9SKrzysztof Halasa 120eb2a2fd9SKrzysztof Halasa static int __init mod_init(void) 121eb2a2fd9SKrzysztof Halasa { 122eb2a2fd9SKrzysztof Halasa register_hdlc_protocol(&proto); 123eb2a2fd9SKrzysztof Halasa return 0; 124eb2a2fd9SKrzysztof Halasa } 125eb2a2fd9SKrzysztof Halasa 126eb2a2fd9SKrzysztof Halasa 127eb2a2fd9SKrzysztof Halasa 128eb2a2fd9SKrzysztof Halasa static void __exit mod_exit(void) 129eb2a2fd9SKrzysztof Halasa { 130eb2a2fd9SKrzysztof Halasa unregister_hdlc_protocol(&proto); 131eb2a2fd9SKrzysztof Halasa } 132eb2a2fd9SKrzysztof Halasa 133eb2a2fd9SKrzysztof Halasa 134eb2a2fd9SKrzysztof Halasa module_init(mod_init); 135eb2a2fd9SKrzysztof Halasa module_exit(mod_exit); 136eb2a2fd9SKrzysztof Halasa 137eb2a2fd9SKrzysztof Halasa MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); 138eb2a2fd9SKrzysztof Halasa MODULE_DESCRIPTION("Ethernet encapsulation support for generic HDLC"); 139eb2a2fd9SKrzysztof Halasa MODULE_LICENSE("GPL v2"); 140