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![Wolfram Sang](/assets/img/avatar_default.png)
Follow the advice of the below link and prefer 'strscpy' in this subsystem. Conversion is 1:1 because the return value is not used. Generated by a coccinelle script. Link: https://lore.kernel.org/r/CAHk-=wgfRnXz0W3D37d01q3JFkr_i_uTL=V6A6G1oUZcprmknw@mail.gmail.com/ Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Richard Weinberger <richard@nod.at>
892 lines
20 KiB
C
892 lines
20 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
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* James Leu (jleu@mindspring.net).
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* Copyright (C) 2001 by various other people who didn't put their name here.
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*/
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#include <linux/memblock.h>
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#include <linux/etherdevice.h>
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#include <linux/ethtool.h>
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#include <linux/inetdevice.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/netdevice.h>
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#include <linux/platform_device.h>
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#include <linux/rtnetlink.h>
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#include <linux/skbuff.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <init.h>
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#include <irq_kern.h>
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#include <irq_user.h>
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#include "mconsole_kern.h"
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#include <net_kern.h>
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#include <net_user.h>
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#define DRIVER_NAME "uml-netdev"
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static DEFINE_SPINLOCK(opened_lock);
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static LIST_HEAD(opened);
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/*
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* The drop_skb is used when we can't allocate an skb. The
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* packet is read into drop_skb in order to get the data off the
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* connection to the host.
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* It is reallocated whenever a maximum packet size is seen which is
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* larger than any seen before. update_drop_skb is called from
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* eth_configure when a new interface is added.
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*/
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static DEFINE_SPINLOCK(drop_lock);
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static struct sk_buff *drop_skb;
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static int drop_max;
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static int update_drop_skb(int max)
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{
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struct sk_buff *new;
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unsigned long flags;
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int err = 0;
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spin_lock_irqsave(&drop_lock, flags);
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if (max <= drop_max)
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goto out;
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err = -ENOMEM;
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new = dev_alloc_skb(max);
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if (new == NULL)
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goto out;
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skb_put(new, max);
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kfree_skb(drop_skb);
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drop_skb = new;
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drop_max = max;
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err = 0;
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out:
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spin_unlock_irqrestore(&drop_lock, flags);
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return err;
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}
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static int uml_net_rx(struct net_device *dev)
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{
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struct uml_net_private *lp = netdev_priv(dev);
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int pkt_len;
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struct sk_buff *skb;
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/* If we can't allocate memory, try again next round. */
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skb = dev_alloc_skb(lp->max_packet);
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if (skb == NULL) {
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drop_skb->dev = dev;
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/* Read a packet into drop_skb and don't do anything with it. */
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(*lp->read)(lp->fd, drop_skb, lp);
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dev->stats.rx_dropped++;
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return 0;
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}
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skb->dev = dev;
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skb_put(skb, lp->max_packet);
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skb_reset_mac_header(skb);
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pkt_len = (*lp->read)(lp->fd, skb, lp);
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if (pkt_len > 0) {
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skb_trim(skb, pkt_len);
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skb->protocol = (*lp->protocol)(skb);
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dev->stats.rx_bytes += skb->len;
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dev->stats.rx_packets++;
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netif_rx(skb);
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return pkt_len;
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}
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kfree_skb(skb);
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return pkt_len;
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}
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static void uml_dev_close(struct work_struct *work)
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{
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struct uml_net_private *lp =
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container_of(work, struct uml_net_private, work);
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dev_close(lp->dev);
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}
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static irqreturn_t uml_net_interrupt(int irq, void *dev_id)
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{
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struct net_device *dev = dev_id;
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struct uml_net_private *lp = netdev_priv(dev);
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int err;
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if (!netif_running(dev))
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return IRQ_NONE;
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spin_lock(&lp->lock);
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while ((err = uml_net_rx(dev)) > 0) ;
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if (err < 0) {
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printk(KERN_ERR
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"Device '%s' read returned %d, shutting it down\n",
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dev->name, err);
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/* dev_close can't be called in interrupt context, and takes
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* again lp->lock.
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* And dev_close() can be safely called multiple times on the
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* same device, since it tests for (dev->flags & IFF_UP). So
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* there's no harm in delaying the device shutdown.
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* Furthermore, the workqueue will not re-enqueue an already
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* enqueued work item. */
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schedule_work(&lp->work);
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goto out;
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}
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out:
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spin_unlock(&lp->lock);
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return IRQ_HANDLED;
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}
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static int uml_net_open(struct net_device *dev)
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{
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struct uml_net_private *lp = netdev_priv(dev);
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int err;
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if (lp->fd >= 0) {
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err = -ENXIO;
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goto out;
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}
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lp->fd = (*lp->open)(&lp->user);
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if (lp->fd < 0) {
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err = lp->fd;
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goto out;
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}
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err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
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IRQF_SHARED, dev->name, dev);
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if (err < 0) {
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printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
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err = -ENETUNREACH;
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goto out_close;
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}
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netif_start_queue(dev);
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/* clear buffer - it can happen that the host side of the interface
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* is full when we get here. In this case, new data is never queued,
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* SIGIOs never arrive, and the net never works.
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*/
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while ((err = uml_net_rx(dev)) > 0) ;
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spin_lock(&opened_lock);
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list_add(&lp->list, &opened);
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spin_unlock(&opened_lock);
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return 0;
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out_close:
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if (lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
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lp->fd = -1;
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out:
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return err;
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}
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static int uml_net_close(struct net_device *dev)
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{
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struct uml_net_private *lp = netdev_priv(dev);
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netif_stop_queue(dev);
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um_free_irq(dev->irq, dev);
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if (lp->close != NULL)
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(*lp->close)(lp->fd, &lp->user);
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lp->fd = -1;
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spin_lock(&opened_lock);
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list_del(&lp->list);
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spin_unlock(&opened_lock);
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return 0;
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}
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static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct uml_net_private *lp = netdev_priv(dev);
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unsigned long flags;
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int len;
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netif_stop_queue(dev);
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spin_lock_irqsave(&lp->lock, flags);
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len = (*lp->write)(lp->fd, skb, lp);
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skb_tx_timestamp(skb);
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if (len == skb->len) {
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dev->stats.tx_packets++;
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dev->stats.tx_bytes += skb->len;
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netif_trans_update(dev);
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netif_start_queue(dev);
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/* this is normally done in the interrupt when tx finishes */
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netif_wake_queue(dev);
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}
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else if (len == 0) {
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netif_start_queue(dev);
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dev->stats.tx_dropped++;
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}
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else {
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netif_start_queue(dev);
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printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
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}
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spin_unlock_irqrestore(&lp->lock, flags);
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dev_consume_skb_any(skb);
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return NETDEV_TX_OK;
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}
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static void uml_net_set_multicast_list(struct net_device *dev)
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{
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return;
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}
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static void uml_net_tx_timeout(struct net_device *dev, unsigned int txqueue)
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{
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netif_trans_update(dev);
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netif_wake_queue(dev);
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}
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#ifdef CONFIG_NET_POLL_CONTROLLER
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static void uml_net_poll_controller(struct net_device *dev)
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{
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disable_irq(dev->irq);
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uml_net_interrupt(dev->irq, dev);
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enable_irq(dev->irq);
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}
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#endif
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static void uml_net_get_drvinfo(struct net_device *dev,
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struct ethtool_drvinfo *info)
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{
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strscpy(info->driver, DRIVER_NAME, sizeof(info->driver));
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}
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static const struct ethtool_ops uml_net_ethtool_ops = {
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.get_drvinfo = uml_net_get_drvinfo,
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.get_link = ethtool_op_get_link,
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.get_ts_info = ethtool_op_get_ts_info,
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};
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void uml_net_setup_etheraddr(struct net_device *dev, char *str)
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{
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u8 addr[ETH_ALEN];
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char *end;
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int i;
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if (str == NULL)
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goto random;
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for (i = 0; i < 6; i++) {
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addr[i] = simple_strtoul(str, &end, 16);
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if ((end == str) ||
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((*end != ':') && (*end != ',') && (*end != '\0'))) {
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printk(KERN_ERR
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"setup_etheraddr: failed to parse '%s' "
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"as an ethernet address\n", str);
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goto random;
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}
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str = end + 1;
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}
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if (is_multicast_ether_addr(addr)) {
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printk(KERN_ERR
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"Attempt to assign a multicast ethernet address to a "
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"device disallowed\n");
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goto random;
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}
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if (!is_valid_ether_addr(addr)) {
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printk(KERN_ERR
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"Attempt to assign an invalid ethernet address to a "
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"device disallowed\n");
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goto random;
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}
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if (!is_local_ether_addr(addr)) {
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printk(KERN_WARNING
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"Warning: Assigning a globally valid ethernet "
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"address to a device\n");
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printk(KERN_WARNING "You should set the 2nd rightmost bit in "
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"the first byte of the MAC,\n");
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printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n",
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addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4],
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addr[5]);
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}
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eth_hw_addr_set(dev, addr);
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return;
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random:
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printk(KERN_INFO
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"Choosing a random ethernet address for device %s\n", dev->name);
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eth_hw_addr_random(dev);
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}
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static DEFINE_SPINLOCK(devices_lock);
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static LIST_HEAD(devices);
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static struct platform_driver uml_net_driver = {
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.driver = {
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.name = DRIVER_NAME,
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},
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};
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static void net_device_release(struct device *dev)
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{
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struct uml_net *device = dev_get_drvdata(dev);
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struct net_device *netdev = device->dev;
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struct uml_net_private *lp = netdev_priv(netdev);
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if (lp->remove != NULL)
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(*lp->remove)(&lp->user);
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list_del(&device->list);
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kfree(device);
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free_netdev(netdev);
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}
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static const struct net_device_ops uml_netdev_ops = {
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.ndo_open = uml_net_open,
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.ndo_stop = uml_net_close,
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.ndo_start_xmit = uml_net_start_xmit,
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.ndo_set_rx_mode = uml_net_set_multicast_list,
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.ndo_tx_timeout = uml_net_tx_timeout,
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.ndo_set_mac_address = eth_mac_addr,
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.ndo_validate_addr = eth_validate_addr,
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#ifdef CONFIG_NET_POLL_CONTROLLER
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.ndo_poll_controller = uml_net_poll_controller,
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#endif
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};
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/*
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* Ensures that platform_driver_register is called only once by
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* eth_configure. Will be set in an initcall.
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*/
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static int driver_registered;
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static void eth_configure(int n, void *init, char *mac,
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struct transport *transport, gfp_t gfp_mask)
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{
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struct uml_net *device;
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struct net_device *dev;
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struct uml_net_private *lp;
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int err, size;
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size = transport->private_size + sizeof(struct uml_net_private);
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device = kzalloc(sizeof(*device), gfp_mask);
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if (device == NULL) {
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printk(KERN_ERR "eth_configure failed to allocate struct "
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"uml_net\n");
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return;
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}
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dev = alloc_etherdev(size);
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if (dev == NULL) {
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printk(KERN_ERR "eth_configure: failed to allocate struct "
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"net_device for eth%d\n", n);
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goto out_free_device;
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}
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INIT_LIST_HEAD(&device->list);
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device->index = n;
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/* If this name ends up conflicting with an existing registered
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* netdevice, that is OK, register_netdev{,ice}() will notice this
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* and fail.
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*/
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snprintf(dev->name, sizeof(dev->name), "eth%d", n);
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uml_net_setup_etheraddr(dev, mac);
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printk(KERN_INFO "Netdevice %d (%pM) : ", n, dev->dev_addr);
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lp = netdev_priv(dev);
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/* This points to the transport private data. It's still clear, but we
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* must memset it to 0 *now*. Let's help the drivers. */
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memset(lp, 0, size);
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INIT_WORK(&lp->work, uml_dev_close);
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/* sysfs register */
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if (!driver_registered) {
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platform_driver_register(¨_net_driver);
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driver_registered = 1;
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}
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device->pdev.id = n;
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device->pdev.name = DRIVER_NAME;
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device->pdev.dev.release = net_device_release;
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dev_set_drvdata(&device->pdev.dev, device);
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if (platform_device_register(&device->pdev))
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goto out_free_netdev;
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SET_NETDEV_DEV(dev,&device->pdev.dev);
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device->dev = dev;
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/*
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* These just fill in a data structure, so there's no failure
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* to be worried about.
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*/
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(*transport->kern->init)(dev, init);
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*lp = ((struct uml_net_private)
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{ .list = LIST_HEAD_INIT(lp->list),
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.dev = dev,
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.fd = -1,
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.mac = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
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.max_packet = transport->user->max_packet,
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.protocol = transport->kern->protocol,
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.open = transport->user->open,
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.close = transport->user->close,
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.remove = transport->user->remove,
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.read = transport->kern->read,
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.write = transport->kern->write,
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.add_address = transport->user->add_address,
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.delete_address = transport->user->delete_address });
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spin_lock_init(&lp->lock);
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memcpy(lp->mac, dev->dev_addr, sizeof(lp->mac));
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if ((transport->user->init != NULL) &&
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((*transport->user->init)(&lp->user, dev) != 0))
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goto out_unregister;
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dev->mtu = transport->user->mtu;
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dev->netdev_ops = ¨_netdev_ops;
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dev->ethtool_ops = ¨_net_ethtool_ops;
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dev->watchdog_timeo = (HZ >> 1);
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dev->irq = UM_ETH_IRQ;
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err = update_drop_skb(lp->max_packet);
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if (err)
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goto out_undo_user_init;
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rtnl_lock();
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err = register_netdevice(dev);
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rtnl_unlock();
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if (err)
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goto out_undo_user_init;
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spin_lock(&devices_lock);
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list_add(&device->list, &devices);
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spin_unlock(&devices_lock);
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return;
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out_undo_user_init:
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if (transport->user->remove != NULL)
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(*transport->user->remove)(&lp->user);
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out_unregister:
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platform_device_unregister(&device->pdev);
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return; /* platform_device_unregister frees dev and device */
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out_free_netdev:
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free_netdev(dev);
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out_free_device:
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kfree(device);
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}
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static struct uml_net *find_device(int n)
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{
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struct uml_net *device;
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struct list_head *ele;
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spin_lock(&devices_lock);
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list_for_each(ele, &devices) {
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device = list_entry(ele, struct uml_net, list);
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if (device->index == n)
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goto out;
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}
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device = NULL;
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out:
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spin_unlock(&devices_lock);
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return device;
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}
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static int eth_parse(char *str, int *index_out, char **str_out,
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char **error_out)
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{
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char *end;
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int n, err = -EINVAL;
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n = simple_strtoul(str, &end, 0);
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if (end == str) {
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*error_out = "Bad device number";
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return err;
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}
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str = end;
|
|
if (*str != '=') {
|
|
*error_out = "Expected '=' after device number";
|
|
return err;
|
|
}
|
|
|
|
str++;
|
|
if (find_device(n)) {
|
|
*error_out = "Device already configured";
|
|
return err;
|
|
}
|
|
|
|
*index_out = n;
|
|
*str_out = str;
|
|
return 0;
|
|
}
|
|
|
|
struct eth_init {
|
|
struct list_head list;
|
|
char *init;
|
|
int index;
|
|
};
|
|
|
|
static DEFINE_SPINLOCK(transports_lock);
|
|
static LIST_HEAD(transports);
|
|
|
|
/* Filled in during early boot */
|
|
static LIST_HEAD(eth_cmd_line);
|
|
|
|
static int check_transport(struct transport *transport, char *eth, int n,
|
|
void **init_out, char **mac_out, gfp_t gfp_mask)
|
|
{
|
|
int len;
|
|
|
|
len = strlen(transport->name);
|
|
if (strncmp(eth, transport->name, len))
|
|
return 0;
|
|
|
|
eth += len;
|
|
if (*eth == ',')
|
|
eth++;
|
|
else if (*eth != '\0')
|
|
return 0;
|
|
|
|
*init_out = kmalloc(transport->setup_size, gfp_mask);
|
|
if (*init_out == NULL)
|
|
return 1;
|
|
|
|
if (!transport->setup(eth, mac_out, *init_out)) {
|
|
kfree(*init_out);
|
|
*init_out = NULL;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
void register_transport(struct transport *new)
|
|
{
|
|
struct list_head *ele, *next;
|
|
struct eth_init *eth;
|
|
void *init;
|
|
char *mac = NULL;
|
|
int match;
|
|
|
|
spin_lock(&transports_lock);
|
|
BUG_ON(!list_empty(&new->list));
|
|
list_add(&new->list, &transports);
|
|
spin_unlock(&transports_lock);
|
|
|
|
list_for_each_safe(ele, next, ð_cmd_line) {
|
|
eth = list_entry(ele, struct eth_init, list);
|
|
match = check_transport(new, eth->init, eth->index, &init,
|
|
&mac, GFP_KERNEL);
|
|
if (!match)
|
|
continue;
|
|
else if (init != NULL) {
|
|
eth_configure(eth->index, init, mac, new, GFP_KERNEL);
|
|
kfree(init);
|
|
}
|
|
list_del(ð->list);
|
|
}
|
|
}
|
|
|
|
static int eth_setup_common(char *str, int index)
|
|
{
|
|
struct list_head *ele;
|
|
struct transport *transport;
|
|
void *init;
|
|
char *mac = NULL;
|
|
int found = 0;
|
|
|
|
spin_lock(&transports_lock);
|
|
list_for_each(ele, &transports) {
|
|
transport = list_entry(ele, struct transport, list);
|
|
if (!check_transport(transport, str, index, &init,
|
|
&mac, GFP_ATOMIC))
|
|
continue;
|
|
if (init != NULL) {
|
|
eth_configure(index, init, mac, transport, GFP_ATOMIC);
|
|
kfree(init);
|
|
}
|
|
found = 1;
|
|
break;
|
|
}
|
|
|
|
spin_unlock(&transports_lock);
|
|
return found;
|
|
}
|
|
|
|
static int __init eth_setup(char *str)
|
|
{
|
|
struct eth_init *new;
|
|
char *error;
|
|
int n, err;
|
|
|
|
err = eth_parse(str, &n, &str, &error);
|
|
if (err) {
|
|
printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
|
|
str, error);
|
|
return 1;
|
|
}
|
|
|
|
new = memblock_alloc(sizeof(*new), SMP_CACHE_BYTES);
|
|
if (!new)
|
|
panic("%s: Failed to allocate %zu bytes\n", __func__,
|
|
sizeof(*new));
|
|
|
|
INIT_LIST_HEAD(&new->list);
|
|
new->index = n;
|
|
new->init = str;
|
|
|
|
list_add_tail(&new->list, ð_cmd_line);
|
|
return 1;
|
|
}
|
|
|
|
__setup("eth", eth_setup);
|
|
__uml_help(eth_setup,
|
|
"eth[0-9]+=<transport>,<options>\n"
|
|
" Configure a network device.\n\n"
|
|
);
|
|
|
|
static int net_config(char *str, char **error_out)
|
|
{
|
|
int n, err;
|
|
|
|
err = eth_parse(str, &n, &str, error_out);
|
|
if (err)
|
|
return err;
|
|
|
|
/* This string is broken up and the pieces used by the underlying
|
|
* driver. So, it is freed only if eth_setup_common fails.
|
|
*/
|
|
str = kstrdup(str, GFP_KERNEL);
|
|
if (str == NULL) {
|
|
*error_out = "net_config failed to strdup string";
|
|
return -ENOMEM;
|
|
}
|
|
err = !eth_setup_common(str, n);
|
|
if (err)
|
|
kfree(str);
|
|
return err;
|
|
}
|
|
|
|
static int net_id(char **str, int *start_out, int *end_out)
|
|
{
|
|
char *end;
|
|
int n;
|
|
|
|
n = simple_strtoul(*str, &end, 0);
|
|
if ((*end != '\0') || (end == *str))
|
|
return -1;
|
|
|
|
*start_out = n;
|
|
*end_out = n;
|
|
*str = end;
|
|
return n;
|
|
}
|
|
|
|
static int net_remove(int n, char **error_out)
|
|
{
|
|
struct uml_net *device;
|
|
struct net_device *dev;
|
|
struct uml_net_private *lp;
|
|
|
|
device = find_device(n);
|
|
if (device == NULL)
|
|
return -ENODEV;
|
|
|
|
dev = device->dev;
|
|
lp = netdev_priv(dev);
|
|
if (lp->fd > 0)
|
|
return -EBUSY;
|
|
unregister_netdev(dev);
|
|
platform_device_unregister(&device->pdev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct mc_device net_mc = {
|
|
.list = LIST_HEAD_INIT(net_mc.list),
|
|
.name = "eth",
|
|
.config = net_config,
|
|
.get_config = NULL,
|
|
.id = net_id,
|
|
.remove = net_remove,
|
|
};
|
|
|
|
#ifdef CONFIG_INET
|
|
static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
|
|
void *ptr)
|
|
{
|
|
struct in_ifaddr *ifa = ptr;
|
|
struct net_device *dev = ifa->ifa_dev->dev;
|
|
struct uml_net_private *lp;
|
|
void (*proc)(unsigned char *, unsigned char *, void *);
|
|
unsigned char addr_buf[4], netmask_buf[4];
|
|
|
|
if (dev->netdev_ops->ndo_open != uml_net_open)
|
|
return NOTIFY_DONE;
|
|
|
|
lp = netdev_priv(dev);
|
|
|
|
proc = NULL;
|
|
switch (event) {
|
|
case NETDEV_UP:
|
|
proc = lp->add_address;
|
|
break;
|
|
case NETDEV_DOWN:
|
|
proc = lp->delete_address;
|
|
break;
|
|
}
|
|
if (proc != NULL) {
|
|
memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
|
|
memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
|
|
(*proc)(addr_buf, netmask_buf, &lp->user);
|
|
}
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
/* uml_net_init shouldn't be called twice on two CPUs at the same time */
|
|
static struct notifier_block uml_inetaddr_notifier = {
|
|
.notifier_call = uml_inetaddr_event,
|
|
};
|
|
|
|
static void inet_register(void)
|
|
{
|
|
struct list_head *ele;
|
|
struct uml_net_private *lp;
|
|
struct in_device *ip;
|
|
struct in_ifaddr *in;
|
|
|
|
register_inetaddr_notifier(¨_inetaddr_notifier);
|
|
|
|
/* Devices may have been opened already, so the uml_inetaddr_notifier
|
|
* didn't get a chance to run for them. This fakes it so that
|
|
* addresses which have already been set up get handled properly.
|
|
*/
|
|
spin_lock(&opened_lock);
|
|
list_for_each(ele, &opened) {
|
|
lp = list_entry(ele, struct uml_net_private, list);
|
|
ip = lp->dev->ip_ptr;
|
|
if (ip == NULL)
|
|
continue;
|
|
in = ip->ifa_list;
|
|
while (in != NULL) {
|
|
uml_inetaddr_event(NULL, NETDEV_UP, in);
|
|
in = in->ifa_next;
|
|
}
|
|
}
|
|
spin_unlock(&opened_lock);
|
|
}
|
|
#else
|
|
static inline void inet_register(void)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static int uml_net_init(void)
|
|
{
|
|
mconsole_register_dev(&net_mc);
|
|
inet_register();
|
|
return 0;
|
|
}
|
|
|
|
__initcall(uml_net_init);
|
|
|
|
static void close_devices(void)
|
|
{
|
|
struct list_head *ele;
|
|
struct uml_net_private *lp;
|
|
|
|
spin_lock(&opened_lock);
|
|
list_for_each(ele, &opened) {
|
|
lp = list_entry(ele, struct uml_net_private, list);
|
|
um_free_irq(lp->dev->irq, lp->dev);
|
|
if ((lp->close != NULL) && (lp->fd >= 0))
|
|
(*lp->close)(lp->fd, &lp->user);
|
|
if (lp->remove != NULL)
|
|
(*lp->remove)(&lp->user);
|
|
}
|
|
spin_unlock(&opened_lock);
|
|
}
|
|
|
|
__uml_exitcall(close_devices);
|
|
|
|
void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
|
|
void *),
|
|
void *arg)
|
|
{
|
|
struct net_device *dev = d;
|
|
struct in_device *ip = dev->ip_ptr;
|
|
struct in_ifaddr *in;
|
|
unsigned char address[4], netmask[4];
|
|
|
|
if (ip == NULL) return;
|
|
in = ip->ifa_list;
|
|
while (in != NULL) {
|
|
memcpy(address, &in->ifa_address, sizeof(address));
|
|
memcpy(netmask, &in->ifa_mask, sizeof(netmask));
|
|
(*cb)(address, netmask, arg);
|
|
in = in->ifa_next;
|
|
}
|
|
}
|
|
|
|
int dev_netmask(void *d, void *m)
|
|
{
|
|
struct net_device *dev = d;
|
|
struct in_device *ip = dev->ip_ptr;
|
|
struct in_ifaddr *in;
|
|
__be32 *mask_out = m;
|
|
|
|
if (ip == NULL)
|
|
return 1;
|
|
|
|
in = ip->ifa_list;
|
|
if (in == NULL)
|
|
return 1;
|
|
|
|
*mask_out = in->ifa_mask;
|
|
return 0;
|
|
}
|
|
|
|
void *get_output_buffer(int *len_out)
|
|
{
|
|
void *ret;
|
|
|
|
ret = (void *) __get_free_pages(GFP_KERNEL, 0);
|
|
if (ret) *len_out = PAGE_SIZE;
|
|
else *len_out = 0;
|
|
return ret;
|
|
}
|
|
|
|
void free_output_buffer(void *buffer)
|
|
{
|
|
free_pages((unsigned long) buffer, 0);
|
|
}
|
|
|
|
int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
|
|
char **gate_addr)
|
|
{
|
|
char *remain;
|
|
|
|
remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
|
|
if (remain != NULL) {
|
|
printk(KERN_ERR "tap_setup_common - Extra garbage on "
|
|
"specification : '%s'\n", remain);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
unsigned short eth_protocol(struct sk_buff *skb)
|
|
{
|
|
return eth_type_trans(skb, skb->dev);
|
|
}
|