https://github.com/torvalds/linux
Tip revision: 1def630a6a49dda5bc89dfbd86656293640456f0 authored by Linus Torvalds on 06 June 2006, 00:57:02 UTC
Linux 2.6.17-rc6
Linux 2.6.17-rc6
Tip revision: 1def630
pkt_act.h
#ifndef __NET_PKT_ACT_H
#define __NET_PKT_ACT_H
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/bitops.h>
#include <linux/config.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/in.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <net/sock.h>
#include <net/pkt_sched.h>
#define tca_st(val) (struct tcf_##val *)
#define PRIV(a,name) ( tca_st(name) (a)->priv)
#if 0 /* control */
#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
#else
#define DPRINTK(format,args...)
#endif
#if 0 /* data */
#define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
#else
#define D2PRINTK(format,args...)
#endif
static __inline__ unsigned
tcf_hash(u32 index)
{
return index & MY_TAB_MASK;
}
/* probably move this from being inline
* and put into act_generic
*/
static inline void
tcf_hash_destroy(struct tcf_st *p)
{
unsigned h = tcf_hash(p->index);
struct tcf_st **p1p;
for (p1p = &tcf_ht[h]; *p1p; p1p = &(*p1p)->next) {
if (*p1p == p) {
write_lock_bh(&tcf_t_lock);
*p1p = p->next;
write_unlock_bh(&tcf_t_lock);
#ifdef CONFIG_NET_ESTIMATOR
gen_kill_estimator(&p->bstats, &p->rate_est);
#endif
kfree(p);
return;
}
}
BUG_TRAP(0);
}
static inline int
tcf_hash_release(struct tcf_st *p, int bind )
{
int ret = 0;
if (p) {
if (bind) {
p->bindcnt--;
}
p->refcnt--;
if(p->bindcnt <=0 && p->refcnt <= 0) {
tcf_hash_destroy(p);
ret = 1;
}
}
return ret;
}
static __inline__ int
tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb,
struct tc_action *a)
{
struct tcf_st *p;
int err =0, index = -1,i= 0, s_i = 0, n_i = 0;
struct rtattr *r ;
read_lock(&tcf_t_lock);
s_i = cb->args[0];
for (i = 0; i < MY_TAB_SIZE; i++) {
p = tcf_ht[tcf_hash(i)];
for (; p; p = p->next) {
index++;
if (index < s_i)
continue;
a->priv = p;
a->order = n_i;
r = (struct rtattr*) skb->tail;
RTA_PUT(skb, a->order, 0, NULL);
err = tcf_action_dump_1(skb, a, 0, 0);
if (0 > err) {
index--;
skb_trim(skb, (u8*)r - skb->data);
goto done;
}
r->rta_len = skb->tail - (u8*)r;
n_i++;
if (n_i >= TCA_ACT_MAX_PRIO) {
goto done;
}
}
}
done:
read_unlock(&tcf_t_lock);
if (n_i)
cb->args[0] += n_i;
return n_i;
rtattr_failure:
skb_trim(skb, (u8*)r - skb->data);
goto done;
}
static __inline__ int
tcf_del_walker(struct sk_buff *skb, struct tc_action *a)
{
struct tcf_st *p, *s_p;
struct rtattr *r ;
int i= 0, n_i = 0;
r = (struct rtattr*) skb->tail;
RTA_PUT(skb, a->order, 0, NULL);
RTA_PUT(skb, TCA_KIND, IFNAMSIZ, a->ops->kind);
for (i = 0; i < MY_TAB_SIZE; i++) {
p = tcf_ht[tcf_hash(i)];
while (p != NULL) {
s_p = p->next;
if (ACT_P_DELETED == tcf_hash_release(p, 0)) {
module_put(a->ops->owner);
}
n_i++;
p = s_p;
}
}
RTA_PUT(skb, TCA_FCNT, 4, &n_i);
r->rta_len = skb->tail - (u8*)r;
return n_i;
rtattr_failure:
skb_trim(skb, (u8*)r - skb->data);
return -EINVAL;
}
static __inline__ int
tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb, int type,
struct tc_action *a)
{
if (type == RTM_DELACTION) {
return tcf_del_walker(skb,a);
} else if (type == RTM_GETACTION) {
return tcf_dump_walker(skb,cb,a);
} else {
printk("tcf_generic_walker: unknown action %d\n",type);
return -EINVAL;
}
}
static __inline__ struct tcf_st *
tcf_hash_lookup(u32 index)
{
struct tcf_st *p;
read_lock(&tcf_t_lock);
for (p = tcf_ht[tcf_hash(index)]; p; p = p->next) {
if (p->index == index)
break;
}
read_unlock(&tcf_t_lock);
return p;
}
static __inline__ u32
tcf_hash_new_index(void)
{
do {
if (++idx_gen == 0)
idx_gen = 1;
} while (tcf_hash_lookup(idx_gen));
return idx_gen;
}
static inline int
tcf_hash_search(struct tc_action *a, u32 index)
{
struct tcf_st *p = tcf_hash_lookup(index);
if (p != NULL) {
a->priv = p;
return 1;
}
return 0;
}
#ifdef CONFIG_NET_ACT_INIT
static inline struct tcf_st *
tcf_hash_check(u32 index, struct tc_action *a, int ovr, int bind)
{
struct tcf_st *p = NULL;
if (index && (p = tcf_hash_lookup(index)) != NULL) {
if (bind) {
p->bindcnt++;
p->refcnt++;
}
a->priv = p;
}
return p;
}
static inline struct tcf_st *
tcf_hash_create(u32 index, struct rtattr *est, struct tc_action *a, int size, int ovr, int bind)
{
struct tcf_st *p = NULL;
p = kmalloc(size, GFP_KERNEL);
if (p == NULL)
return p;
memset(p, 0, size);
p->refcnt = 1;
if (bind) {
p->bindcnt = 1;
}
spin_lock_init(&p->lock);
p->stats_lock = &p->lock;
p->index = index ? : tcf_hash_new_index();
p->tm.install = jiffies;
p->tm.lastuse = jiffies;
#ifdef CONFIG_NET_ESTIMATOR
if (est)
gen_new_estimator(&p->bstats, &p->rate_est, p->stats_lock, est);
#endif
a->priv = (void *) p;
return p;
}
static inline void tcf_hash_insert(struct tcf_st *p)
{
unsigned h = tcf_hash(p->index);
write_lock_bh(&tcf_t_lock);
p->next = tcf_ht[h];
tcf_ht[h] = p;
write_unlock_bh(&tcf_t_lock);
}
#endif
#endif