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/errno.h> 131da177e4SLinus Torvalds #include <linux/etherdevice.h> 141da177e4SLinus Torvalds #include <linux/hdlc.h> 154dfce407SKrzysztof Hałasa #include <linux/if_arp.h> 164dfce407SKrzysztof Hałasa #include <linux/inetdevice.h> 174dfce407SKrzysztof Hałasa #include <linux/init.h> 184dfce407SKrzysztof Hałasa #include <linux/kernel.h> 194dfce407SKrzysztof Hałasa #include <linux/module.h> 204dfce407SKrzysztof Hałasa #include <linux/pkt_sched.h> 214dfce407SKrzysztof Hałasa #include <linux/poll.h> 224dfce407SKrzysztof Hałasa #include <linux/rtnetlink.h> 234dfce407SKrzysztof Hałasa #include <linux/skbuff.h> 244dfce407SKrzysztof Hałasa #include <linux/slab.h> 251da177e4SLinus Torvalds 26eb2a2fd9SKrzysztof Halasa static int raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr); 271da177e4SLinus Torvalds 28d71a6749SStephen Hemminger static netdev_tx_t eth_tx(struct sk_buff *skb, struct net_device *dev) 291da177e4SLinus Torvalds { 301da177e4SLinus Torvalds int pad = ETH_ZLEN - skb->len; 311da177e4SLinus Torvalds if (pad > 0) { /* Pad the frame with zeros */ 321da177e4SLinus Torvalds int len = skb->len; 331da177e4SLinus Torvalds if (skb_tailroom(skb) < pad) 341da177e4SLinus Torvalds if (pskb_expand_head(skb, 0, pad, GFP_ATOMIC)) { 35198191c4SKrzysztof Halasa dev->stats.tx_dropped++; 361da177e4SLinus Torvalds dev_kfree_skb(skb); 371da177e4SLinus Torvalds return 0; 381da177e4SLinus Torvalds } 391da177e4SLinus Torvalds skb_put(skb, pad); 401da177e4SLinus Torvalds memset(skb->data + len, 0, pad); 411da177e4SLinus Torvalds } 421da177e4SLinus Torvalds return dev_to_hdlc(dev)->xmit(skb, dev); 431da177e4SLinus Torvalds } 441da177e4SLinus Torvalds 451da177e4SLinus Torvalds 46eb2a2fd9SKrzysztof Halasa static struct hdlc_proto proto = { 47eb2a2fd9SKrzysztof Halasa .type_trans = eth_type_trans, 48991990a1SKrzysztof Hałasa .xmit = eth_tx, 49eb2a2fd9SKrzysztof Halasa .ioctl = raw_eth_ioctl, 50eb2a2fd9SKrzysztof Halasa .module = THIS_MODULE, 51eb2a2fd9SKrzysztof Halasa }; 52eb2a2fd9SKrzysztof Halasa 53eb2a2fd9SKrzysztof Halasa 54eb2a2fd9SKrzysztof Halasa static int raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr) 551da177e4SLinus Torvalds { 561da177e4SLinus Torvalds raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc; 571da177e4SLinus Torvalds const size_t size = sizeof(raw_hdlc_proto); 581da177e4SLinus Torvalds raw_hdlc_proto new_settings; 591da177e4SLinus Torvalds hdlc_device *hdlc = dev_to_hdlc(dev); 60991990a1SKrzysztof Hałasa int result, old_qlen; 611da177e4SLinus Torvalds 621da177e4SLinus Torvalds switch (ifr->ifr_settings.type) { 631da177e4SLinus Torvalds case IF_GET_PROTO: 64eb2a2fd9SKrzysztof Halasa if (dev_to_hdlc(dev)->proto != &proto) 65eb2a2fd9SKrzysztof Halasa return -EINVAL; 661da177e4SLinus Torvalds ifr->ifr_settings.type = IF_PROTO_HDLC_ETH; 671da177e4SLinus Torvalds if (ifr->ifr_settings.size < size) { 681da177e4SLinus Torvalds ifr->ifr_settings.size = size; /* data size wanted */ 691da177e4SLinus Torvalds return -ENOBUFS; 701da177e4SLinus Torvalds } 71eb2a2fd9SKrzysztof Halasa if (copy_to_user(raw_s, hdlc->state, size)) 721da177e4SLinus Torvalds return -EFAULT; 731da177e4SLinus Torvalds return 0; 741da177e4SLinus Torvalds 751da177e4SLinus Torvalds case IF_PROTO_HDLC_ETH: 761da177e4SLinus Torvalds if (!capable(CAP_NET_ADMIN)) 771da177e4SLinus Torvalds return -EPERM; 781da177e4SLinus Torvalds 791da177e4SLinus Torvalds if (dev->flags & IFF_UP) 801da177e4SLinus Torvalds return -EBUSY; 811da177e4SLinus Torvalds 821da177e4SLinus Torvalds if (copy_from_user(&new_settings, raw_s, size)) 831da177e4SLinus Torvalds return -EFAULT; 841da177e4SLinus Torvalds 851da177e4SLinus Torvalds if (new_settings.encoding == ENCODING_DEFAULT) 861da177e4SLinus Torvalds new_settings.encoding = ENCODING_NRZ; 871da177e4SLinus Torvalds 881da177e4SLinus Torvalds if (new_settings.parity == PARITY_DEFAULT) 891da177e4SLinus Torvalds new_settings.parity = PARITY_CRC16_PR1_CCITT; 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds result = hdlc->attach(dev, new_settings.encoding, 921da177e4SLinus Torvalds new_settings.parity); 931da177e4SLinus Torvalds if (result) 941da177e4SLinus Torvalds return result; 951da177e4SLinus Torvalds 9640d25142SKrzysztof Halasa result = attach_hdlc_protocol(dev, &proto, 97eb2a2fd9SKrzysztof Halasa sizeof(raw_hdlc_proto)); 98eb2a2fd9SKrzysztof Halasa if (result) 99eb2a2fd9SKrzysztof Halasa return result; 100eb2a2fd9SKrzysztof Halasa memcpy(hdlc->state, &new_settings, size); 1011da177e4SLinus Torvalds old_qlen = dev->tx_queue_len; 1021da177e4SLinus Torvalds ether_setup(dev); 1031da177e4SLinus Torvalds dev->tx_queue_len = old_qlen; 10447eaa267SKrzysztof Halasa random_ether_addr(dev->dev_addr); 1054bc83b4dSKrzysztof Halasa netif_dormant_off(dev); 1061da177e4SLinus Torvalds return 0; 1071da177e4SLinus Torvalds } 1081da177e4SLinus Torvalds 1091da177e4SLinus Torvalds return -EINVAL; 1101da177e4SLinus Torvalds } 111eb2a2fd9SKrzysztof Halasa 112eb2a2fd9SKrzysztof Halasa 113eb2a2fd9SKrzysztof Halasa static int __init mod_init(void) 114eb2a2fd9SKrzysztof Halasa { 115eb2a2fd9SKrzysztof Halasa register_hdlc_protocol(&proto); 116eb2a2fd9SKrzysztof Halasa return 0; 117eb2a2fd9SKrzysztof Halasa } 118eb2a2fd9SKrzysztof Halasa 119eb2a2fd9SKrzysztof Halasa 120eb2a2fd9SKrzysztof Halasa 121eb2a2fd9SKrzysztof Halasa static void __exit mod_exit(void) 122eb2a2fd9SKrzysztof Halasa { 123eb2a2fd9SKrzysztof Halasa unregister_hdlc_protocol(&proto); 124eb2a2fd9SKrzysztof Halasa } 125eb2a2fd9SKrzysztof Halasa 126eb2a2fd9SKrzysztof Halasa 127eb2a2fd9SKrzysztof Halasa module_init(mod_init); 128eb2a2fd9SKrzysztof Halasa module_exit(mod_exit); 129eb2a2fd9SKrzysztof Halasa 130eb2a2fd9SKrzysztof Halasa MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); 131eb2a2fd9SKrzysztof Halasa MODULE_DESCRIPTION("Ethernet encapsulation support for generic HDLC"); 132eb2a2fd9SKrzysztof Halasa MODULE_LICENSE("GPL v2"); 133