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/*
* Pseudo-driver for the intermediate queue device.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Authors: Patrick McHardy, <kaber@trash.net>
*
* The first version was written by Martin Devera, <devik@cdi.cz>
*
* Credits: Jan Rafaj <imq2t@cedric.vabo.cz>
* - Update patch to 2.4.21
* Sebastian Strollo <sstrollo@nortelnetworks.com>
* - Fix "Dead-loop on netdevice imq"-issue
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/config.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <linux/if_arp.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
#include <linux/netfilter_ipv6.h>
#endif
#include <linux/imq.h>
#include <net/pkt_sched.h>
static nf_hookfn imq_nf_hook;
static struct nf_hook_ops imq_ingress_ipv4 = {
{ NULL, NULL},
imq_nf_hook,
PF_INET,
NF_IP_PRE_ROUTING,
NF_IP_PRI_MANGLE + 1
};
static struct nf_hook_ops imq_egress_ipv4 = {
{ NULL, NULL},
imq_nf_hook,
PF_INET,
NF_IP_POST_ROUTING,
NF_IP_PRI_LAST
};
#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
static struct nf_hook_ops imq_ingress_ipv6 = {
{ NULL, NULL},
imq_nf_hook,
PF_INET6,
NF_IP6_PRE_ROUTING,
NF_IP6_PRI_MANGLE + 1
};
static struct nf_hook_ops imq_egress_ipv6 = {
{ NULL, NULL},
imq_nf_hook,
PF_INET6,
NF_IP6_POST_ROUTING,
NF_IP6_PRI_LAST
};
#endif
static unsigned int numdevs = 2;
MODULE_PARM(numdevs, "i");
MODULE_PARM_DESC(numdevs, "number of imq devices");
static struct net_device *imq_devs;
static struct net_device_stats *imq_get_stats(struct net_device *dev)
{
return (struct net_device_stats *)dev->priv;
}
/* called for packets kfree'd in qdiscs at places other than enqueue */
static void imq_skb_destructor(struct sk_buff *skb)
{
struct nf_info *info = skb->nf_info;
if (info) {
if (info->indev)
dev_put(info->indev);
if (info->outdev)
dev_put(info->outdev);
kfree(info);
}
}
static int imq_dev_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct net_device_stats *stats = (struct net_device_stats*) dev->priv;
stats->tx_bytes += skb->len;
stats->tx_packets++;
skb->imq_flags = 0;
skb->destructor = NULL;
dev->trans_start = jiffies;
nf_reinject(skb, skb->nf_info, NF_ACCEPT);
return 0;
}
static int imq_nf_queue(struct sk_buff *skb, struct nf_info *info,
void *data)
{
struct net_device *dev;
struct net_device_stats *stats;
struct sk_buff *skb2 = NULL;
struct Qdisc *q;
unsigned int index = skb->imq_flags&IMQ_F_IFMASK;
int ret = -1;
if (index > numdevs)
return -1;
dev = imq_devs + index;
if (!(dev->flags & IFF_UP)) {
skb->imq_flags = 0;
nf_reinject(skb, info, NF_ACCEPT);
return 0;
}
dev->last_rx = jiffies;
if (skb->destructor) {
skb2 = skb;
skb = skb_clone(skb, GFP_ATOMIC);
if (!skb)
return -1;
}
skb->nf_info = info;
stats = (struct net_device_stats *)dev->priv;
stats->rx_bytes+= skb->len;
stats->rx_packets++;
spin_lock_bh(&dev->queue_lock);
q = dev->qdisc;
if (q->enqueue) {
q->enqueue(skb_get(skb), q);
if (skb_shared(skb)) {
skb->destructor = imq_skb_destructor;
kfree_skb(skb);
ret = 0;
}
}
if (spin_is_locked(&dev->xmit_lock))
netif_schedule(dev);
else
qdisc_run(dev);
spin_unlock_bh(&dev->queue_lock);
if (skb2)
kfree_skb(ret ? skb : skb2);
return ret;
}
static unsigned int imq_nf_hook(unsigned int hook, struct sk_buff **pskb,
const struct net_device *indev,
const struct net_device *outdev,
int (*okfn)(struct sk_buff *))
{
if ((*pskb)->imq_flags & IMQ_F_ENQUEUE)
return NF_QUEUE;
return NF_ACCEPT;
}
static int __init imq_init_hooks(void)
{
int err;
if ((err = nf_register_queue_handler(PF_INET, imq_nf_queue, NULL)))
goto err1;
if ((err = nf_register_hook(&imq_ingress_ipv4)))
goto err2;
if ((err = nf_register_hook(&imq_egress_ipv4)))
goto err3;
#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
if ((err = nf_register_queue_handler(PF_INET6, imq_nf_queue, NULL)))
goto err4;
if ((err = nf_register_hook(&imq_ingress_ipv6)))
goto err5;
if ((err = nf_register_hook(&imq_egress_ipv6)))
goto err6;
#endif
return 0;
#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
err6:
nf_unregister_hook(&imq_ingress_ipv6);
err5:
nf_unregister_queue_handler(PF_INET6);
err4:
nf_unregister_hook(&imq_egress_ipv4);
#endif
err3:
nf_unregister_hook(&imq_ingress_ipv4);
err2:
nf_unregister_queue_handler(PF_INET);
err1:
return err;
}
static void __exit imq_unhook(void)
{
nf_unregister_hook(&imq_ingress_ipv4);
nf_unregister_hook(&imq_egress_ipv4);
nf_unregister_queue_handler(PF_INET);
#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
nf_unregister_hook(&imq_ingress_ipv6);
nf_unregister_hook(&imq_egress_ipv6);
nf_unregister_queue_handler(PF_INET6);
#endif
}
static int __init imq_dev_init(struct net_device *dev)
{
dev->hard_start_xmit = imq_dev_xmit;
dev->type = ARPHRD_VOID;
dev->mtu = 1500;
dev->tx_queue_len = 30;
dev->flags = IFF_NOARP;
dev->priv = kmalloc(sizeof(struct net_device_stats), GFP_KERNEL);
if (dev->priv == NULL)
return -ENOMEM;
memset(dev->priv, 0, sizeof(struct net_device_stats));
dev->get_stats = imq_get_stats;
return 0;
}
static void imq_dev_uninit(struct net_device *dev)
{
kfree(dev->priv);
}
static int __init imq_init_devs(void)
{
struct net_device *dev;
int i;
if (!numdevs || numdevs > IMQ_MAX_DEVS) {
printk(KERN_ERR "numdevs has to be betweed 1 and %u\n",
IMQ_MAX_DEVS);
return -EINVAL;
}
imq_devs = kmalloc(sizeof(struct net_device) * numdevs, GFP_KERNEL);
if (!imq_devs)
return -ENOMEM;
memset(imq_devs, 0, sizeof(struct net_device) * numdevs);
/* we start counting at zero */
numdevs--;
for (i = 0, dev = imq_devs; i <= numdevs; i++, dev++) {
SET_MODULE_OWNER(dev);
strcpy(dev->name, "imq%d");
dev->init = imq_dev_init;
dev->uninit = imq_dev_uninit;
if (register_netdev(dev) < 0)
goto err_register;
}
return 0;
err_register:
for (; i; i--)
unregister_netdev(--dev);
kfree(imq_devs);
return -EIO;
}
static void imq_cleanup_devs(void)
{
int i;
struct net_device *dev = imq_devs;
for (i = 0; i <= numdevs; i++)
unregister_netdev(dev++);
kfree(imq_devs);
}
static int __init imq_init_module(void)
{
int err;
if ((err = imq_init_devs()))
return err;
if ((err = imq_init_hooks())) {
imq_cleanup_devs();
return err;
}
printk(KERN_INFO "imq driver loaded.\n");
return 0;
}
static void __exit imq_cleanup_module(void)
{
imq_unhook();
imq_cleanup_devs();
}
module_init(imq_init_module);
module_exit(imq_cleanup_module);
MODULE_LICENSE("GPL");
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