81213b5e8a
If both addresses equal, nothing needs to be done. If the device is down, then we simply copy the new address to dev->dev_addr. If the device is up, then we add another loopback device with the new address, and if that does not fail, we remove the loopback device with the old address. And only then, we update the dev->dev_addr. Signed-off-by: Daniel Borkmann <daniel.borkmann@tik.ee.ethz.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
173 lines
3.6 KiB
C
173 lines
3.6 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
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*/
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#include <linux/module.h>
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#include <linux/proc_fs.h>
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#include <linux/kernel.h>
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#include <linux/interrupt.h>
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#include <linux/fs.h>
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#include <linux/types.h>
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#include <linux/sysctl.h>
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#include <linux/string.h>
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#include <linux/socket.h>
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#include <linux/errno.h>
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#include <linux/fcntl.h>
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#include <linux/in.h>
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#include <linux/if_ether.h>
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#include <linux/slab.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/if_arp.h>
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#include <linux/skbuff.h>
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#include <net/ip.h>
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#include <net/arp.h>
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#include <net/ax25.h>
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#include <net/rose.h>
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static int rose_header(struct sk_buff *skb, struct net_device *dev,
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unsigned short type,
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const void *daddr, const void *saddr, unsigned len)
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{
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unsigned char *buff = skb_push(skb, ROSE_MIN_LEN + 2);
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*buff++ = ROSE_GFI | ROSE_Q_BIT;
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*buff++ = 0x00;
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*buff++ = ROSE_DATA;
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*buff++ = 0x7F;
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*buff++ = AX25_P_IP;
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if (daddr != NULL)
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return 37;
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return -37;
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}
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static int rose_rebuild_header(struct sk_buff *skb)
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{
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#ifdef CONFIG_INET
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struct net_device *dev = skb->dev;
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struct net_device_stats *stats = &dev->stats;
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unsigned char *bp = (unsigned char *)skb->data;
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struct sk_buff *skbn;
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unsigned int len;
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if (arp_find(bp + 7, skb)) {
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return 1;
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}
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if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) {
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kfree_skb(skb);
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return 1;
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}
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if (skb->sk != NULL)
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skb_set_owner_w(skbn, skb->sk);
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kfree_skb(skb);
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len = skbn->len;
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if (!rose_route_frame(skbn, NULL)) {
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kfree_skb(skbn);
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stats->tx_errors++;
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return 1;
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}
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stats->tx_packets++;
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stats->tx_bytes += len;
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#endif
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return 1;
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}
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static int rose_set_mac_address(struct net_device *dev, void *addr)
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{
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struct sockaddr *sa = addr;
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int err;
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if (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len))
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return 0;
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if (dev->flags & IFF_UP) {
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err = rose_add_loopback_node((rose_address *)sa->sa_data);
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if (err)
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return err;
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rose_del_loopback_node((rose_address *)dev->dev_addr);
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}
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memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
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return 0;
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}
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static int rose_open(struct net_device *dev)
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{
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int err;
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err = rose_add_loopback_node((rose_address *)dev->dev_addr);
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if (err)
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return err;
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netif_start_queue(dev);
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return 0;
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}
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static int rose_close(struct net_device *dev)
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{
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netif_stop_queue(dev);
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rose_del_loopback_node((rose_address *)dev->dev_addr);
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return 0;
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}
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static netdev_tx_t rose_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct net_device_stats *stats = &dev->stats;
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if (!netif_running(dev)) {
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printk(KERN_ERR "ROSE: rose_xmit - called when iface is down\n");
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return NETDEV_TX_BUSY;
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}
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dev_kfree_skb(skb);
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stats->tx_errors++;
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return NETDEV_TX_OK;
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}
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static const struct header_ops rose_header_ops = {
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.create = rose_header,
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.rebuild= rose_rebuild_header,
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};
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static const struct net_device_ops rose_netdev_ops = {
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.ndo_open = rose_open,
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.ndo_stop = rose_close,
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.ndo_start_xmit = rose_xmit,
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.ndo_set_mac_address = rose_set_mac_address,
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};
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void rose_setup(struct net_device *dev)
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{
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dev->mtu = ROSE_MAX_PACKET_SIZE - 2;
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dev->netdev_ops = &rose_netdev_ops;
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dev->header_ops = &rose_header_ops;
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dev->hard_header_len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN;
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dev->addr_len = ROSE_ADDR_LEN;
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dev->type = ARPHRD_ROSE;
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/* New-style flags. */
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dev->flags = IFF_NOARP;
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}
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