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drivers/net/wan/hdlc_raw_eth.c
3.08 KB
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/* * Generic HDLC support routines for Linux * HDLC Ethernet emulation support * |
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* Copyright (C) 2002-2006 Krzysztof Halasa <khc@pm.waw.pl> |
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* * 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. */ |
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#include <linux/errno.h> |
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#include <linux/etherdevice.h> #include <linux/hdlc.h> |
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#include <linux/if_arp.h> |
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#include <linux/inetdevice.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> #include <linux/module.h> |
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#include <linux/pkt_sched.h> |
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#include <linux/poll.h> |
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#include <linux/rtnetlink.h> |
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#include <linux/skbuff.h> #include <linux/slab.h> |
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static int raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr); |
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static netdev_tx_t eth_tx(struct sk_buff *skb, struct net_device *dev) |
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{ int pad = ETH_ZLEN - skb->len; if (pad > 0) { /* Pad the frame with zeros */ int len = skb->len; if (skb_tailroom(skb) < pad) if (pskb_expand_head(skb, 0, pad, GFP_ATOMIC)) { |
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dev->stats.tx_dropped++; |
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dev_kfree_skb(skb); return 0; } skb_put(skb, pad); memset(skb->data + len, 0, pad); } return dev_to_hdlc(dev)->xmit(skb, dev); } |
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static struct hdlc_proto proto = { .type_trans = eth_type_trans, |
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.xmit = eth_tx, |
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.ioctl = raw_eth_ioctl, .module = THIS_MODULE, }; static int raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr) |
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{ 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); |
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int result, old_qlen; |
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switch (ifr->ifr_settings.type) { case IF_GET_PROTO: |
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if (dev_to_hdlc(dev)->proto != &proto) return -EINVAL; |
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ifr->ifr_settings.type = IF_PROTO_HDLC_ETH; if (ifr->ifr_settings.size < size) { ifr->ifr_settings.size = size; /* data size wanted */ return -ENOBUFS; } |
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if (copy_to_user(raw_s, hdlc->state, size)) |
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return -EFAULT; return 0; case IF_PROTO_HDLC_ETH: 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; |
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result = attach_hdlc_protocol(dev, &proto, |
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sizeof(raw_hdlc_proto)); if (result) return result; memcpy(hdlc->state, &new_settings, size); |
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old_qlen = dev->tx_queue_len; ether_setup(dev); |
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dev->tx_queue_len = old_qlen; |
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random_ether_addr(dev->dev_addr); |
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netif_dormant_off(dev); |
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return 0; } return -EINVAL; } |
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static int __init mod_init(void) { register_hdlc_protocol(&proto); return 0; } static void __exit mod_exit(void) { unregister_hdlc_protocol(&proto); } module_init(mod_init); module_exit(mod_exit); MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); MODULE_DESCRIPTION("Ethernet encapsulation support for generic HDLC"); MODULE_LICENSE("GPL v2"); |