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#include <linux/config.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/netdevice.h>
#include <linux/string.h>
#include <linux/skbuff.h>
#include <linux/proc_fs.h>
#include <linux/init.h>
#include <linux/ip.h>
#include <linux/inet.h>
#include <net/checksum.h>
#include <asm/processor.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <net/profile.h>
#ifdef CONFIG_NET_PROFILE
atomic_t net_profile_active;
struct timeval net_profile_adjust;
NET_PROFILE_DEFINE(total);
struct net_profile_slot *net_profile_chain = &net_prof_total;
#ifdef __alpha__
__u32 alpha_lo;
long alpha_hi;
static void alpha_tick(unsigned long);
static struct timer_list alpha_timer =
{ NULL, NULL, 0, 0L, alpha_tick };
void alpha_tick(unsigned long dummy)
{
struct timeval dummy_stamp;
net_profile_stamp(&dummy_stamp);
alpha_timer.expires = jiffies + 4*HZ;
add_timer(&alpha_timer);
}
#endif
void net_profile_irq_adjust(struct timeval *entered, struct timeval* leaved)
{
struct net_profile_slot *s;
net_profile_sub(entered, leaved);
for (s = net_profile_chain; s; s = s->next) {
if (s->active)
net_profile_add(leaved, &s->irq);
}
}
#ifdef CONFIG_PROC_FS
static int profile_read_proc(char *buffer, char **start, off_t offset,
int length, int *eof, void *data)
{
off_t pos=0;
off_t begin=0;
int len=0;
struct net_profile_slot *s;
len+= sprintf(buffer, "Slot Hits Hi Lo OnIrqHi OnIrqLo Ufl\n");
if (offset == 0) {
cli();
net_prof_total.active = 1;
atomic_inc(&net_profile_active);
NET_PROFILE_LEAVE(total);
sti();
}
for (s = net_profile_chain; s; s = s->next) {
struct net_profile_slot tmp;
cli();
tmp = *s;
/* Wrong, but pretty close to truth */
s->accumulator.tv_sec = 0;
s->accumulator.tv_usec = 0;
s->irq.tv_sec = 0;
s->irq.tv_usec = 0;
s->hits = 0;
s->underflow = 0;
/* Repair active count, it is possible, only if code has a bug */
if (s->active) {
s->active = 0;
atomic_dec(&net_profile_active);
}
sti();
net_profile_sub(&tmp.irq, &tmp.accumulator);
len += sprintf(buffer+len,"%-15s %-10d %-10ld %-10lu %-10lu %-10lu %d/%d",
tmp.id,
tmp.hits,
tmp.accumulator.tv_sec,
tmp.accumulator.tv_usec,
tmp.irq.tv_sec,
tmp.irq.tv_usec,
tmp.underflow, tmp.active);
buffer[len++]='\n';
pos=begin+len;
if(pos<offset) {
len=0;
begin=pos;
}
if(pos>offset+length)
goto done;
}
*eof = 1;
done:
*start=buffer+(offset-begin);
len-=(offset-begin);
if(len>length)
len=length;
if (len < 0)
len = 0;
if (offset == 0) {
cli();
net_prof_total.active = 0;
net_prof_total.hits = 0;
net_profile_stamp(&net_prof_total.entered);
sti();
}
return len;
}
#endif
struct iphdr whitehole_iph;
int whitehole_count;
static int whitehole_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct net_device_stats *stats;
stats = (struct net_device_stats *)dev->priv;
stats->tx_packets++;
stats->tx_bytes+=skb->len;
dev_kfree_skb(skb);
return 0;
}
static void whitehole_inject(unsigned long);
int whitehole_init(struct net_device *dev);
static struct timer_list whitehole_timer =
{ NULL, NULL, 0, 0L, whitehole_inject };
static struct net_device whitehole_dev = {
"whitehole", 0x0, 0x0, 0x0, 0x0, 0, 0, 0, 0, 0, NULL, whitehole_init, };
static int whitehole_open(struct net_device *dev)
{
whitehole_count = 100000;
whitehole_timer.expires = jiffies + 5*HZ;
add_timer(&whitehole_timer);
return 0;
}
static int whitehole_close(struct net_device *dev)
{
del_timer(&whitehole_timer);
return 0;
}
static void whitehole_inject(unsigned long dummy)
{
struct net_device_stats *stats = (struct net_device_stats *)whitehole_dev.priv;
extern int netdev_dropping;
do {
struct iphdr *iph;
struct sk_buff *skb = alloc_skb(128, GFP_ATOMIC);
if (!skb)
break;
skb_reserve(skb, 32);
iph = (struct iphdr*)skb_put(skb, sizeof(*iph));
skb->mac.raw = ((u8*)iph) - 14;
memcpy(iph, &whitehole_iph, sizeof(*iph));
skb->protocol = __constant_htons(ETH_P_IP);
skb->dev = &whitehole_dev;
skb->pkt_type = PACKET_HOST;
stats->rx_packets++;
stats->rx_bytes += skb->len;
netif_rx(skb);
whitehole_count--;
} while (netdev_dropping == 0 && whitehole_count>0);
if (whitehole_count > 0) {
whitehole_timer.expires = jiffies + 1;
add_timer(&whitehole_timer);
}
}
static struct net_device_stats *whitehole_get_stats(struct net_device *dev)
{
struct net_device_stats *stats = (struct net_device_stats *) dev->priv;
return stats;
}
int __init whitehole_init(struct net_device *dev)
{
dev->priv = kmalloc(sizeof(struct net_device_stats), GFP_KERNEL);
if (dev->priv == NULL)
return -ENOBUFS;
memset(dev->priv, 0, sizeof(struct net_device_stats));
dev->get_stats = whitehole_get_stats;
dev->hard_start_xmit = whitehole_xmit;
dev->open = whitehole_open;
dev->stop = whitehole_close;
ether_setup(dev);
dev->tx_queue_len = 0;
dev->flags |= IFF_NOARP;
dev->flags &= ~(IFF_BROADCAST|IFF_MULTICAST);
dev->iflink = 0;
whitehole_iph.ihl = 5;
whitehole_iph.version = 4;
whitehole_iph.ttl = 2;
whitehole_iph.saddr = in_aton("193.233.7.21");
whitehole_iph.daddr = in_aton("193.233.7.10");
whitehole_iph.tot_len = htons(20);
whitehole_iph.check = ip_compute_csum((void *)&whitehole_iph, 20);
return 0;
}
int net_profile_register(struct net_profile_slot *slot)
{
cli();
slot->next = net_profile_chain;
net_profile_chain = slot;
sti();
return 0;
}
int net_profile_unregister(struct net_profile_slot *slot)
{
struct net_profile_slot **sp, *s;
for (sp = &net_profile_chain; (s = *sp) != NULL; sp = &s->next) {
if (s == slot) {
cli();
*sp = s->next;
sti();
return 0;
}
}
return -ESRCH;
}
int __init net_profile_init(void)
{
int i;
#ifdef CONFIG_PROC_FS
create_proc_read_entry("net/profile", 0, 0, profile_read_proc, NULL);
#endif
register_netdevice(&whitehole_dev);
printk("Evaluating net profiler cost ...");
#ifdef __alpha__
alpha_tick(0);
#endif
for (i=0; i<1024; i++) {
NET_PROFILE_ENTER(total);
NET_PROFILE_LEAVE(total);
}
if (net_prof_total.accumulator.tv_sec) {
printk(" too high!\n");
} else {
net_profile_adjust.tv_usec = net_prof_total.accumulator.tv_usec>>10;
printk("%ld units\n", net_profile_adjust.tv_usec);
}
net_prof_total.hits = 0;
net_profile_stamp(&net_prof_total.entered);
return 0;
}
#endif
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