/*
* net/sched/act_api.c Packet action API.
*
* 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.
*
* Author: Jamal Hadi Salim
*
*
*/
#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/netdevice.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <linux/init.h>
#include <linux/kmod.h>
#include <net/sock.h>
#include <net/sch_generic.h>
#include <net/act_api.h>
#if 1 /* 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 struct tc_action_ops *act_base = NULL;
static DEFINE_RWLOCK(act_mod_lock);
int tcf_register_action(struct tc_action_ops *act)
{
struct tc_action_ops *a, **ap;
write_lock(&act_mod_lock);
for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) {
if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
write_unlock(&act_mod_lock);
return -EEXIST;
}
}
act->next = NULL;
*ap = act;
write_unlock(&act_mod_lock);
return 0;
}
int tcf_unregister_action(struct tc_action_ops *act)
{
struct tc_action_ops *a, **ap;
int err = -ENOENT;
write_lock(&act_mod_lock);
for (ap = &act_base; (a = *ap) != NULL; ap = &a->next)
if (a == act)
break;
if (a) {
*ap = a->next;
a->next = NULL;
err = 0;
}
write_unlock(&act_mod_lock);
return err;
}
/* lookup by name */
static struct tc_action_ops *tc_lookup_action_n(char *kind)
{
struct tc_action_ops *a = NULL;
if (kind) {
read_lock(&act_mod_lock);
for (a = act_base; a; a = a->next) {
if (strcmp(kind, a->kind) == 0) {
if (!try_module_get(a->owner)) {
read_unlock(&act_mod_lock);
return NULL;
}
break;
}
}
read_unlock(&act_mod_lock);
}
return a;
}
/* lookup by rtattr */
static struct tc_action_ops *tc_lookup_action(struct rtattr *kind)
{
struct tc_action_ops *a = NULL;
if (kind) {
read_lock(&act_mod_lock);
for (a = act_base; a; a = a->next) {
if (rtattr_strcmp(kind, a->kind) == 0) {
if (!try_module_get(a->owner)) {
read_unlock(&act_mod_lock);
return NULL;
}
break;
}
}
read_unlock(&act_mod_lock);
}
return a;
}
#if 0
/* lookup by id */
static struct tc_action_ops *tc_lookup_action_id(u32 type)
{
struct tc_action_ops *a = NULL;
if (type) {
read_lock(&act_mod_lock);
for (a = act_base; a; a = a->next) {
if (a->type == type) {
if (!try_module_get(a->owner)) {
read_unlock(&act_mod_lock);
return NULL;
}
break;
}
}
read_unlock(&act_mod_lock);
}
return a;
}
#endif
int tcf_action_exec(struct sk_buff *skb, struct tc_action *act,
struct tcf_result *res)
{
struct tc_action *a;
int ret = -1;
if (skb->tc_verd & TC_NCLS) {
skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
D2PRINTK("(%p)tcf_action_exec: cleared TC_NCLS in %s out %s\n",
skb, skb->input_dev ? skb->input_dev->name : "xxx",
skb->dev->name);
ret = TC_ACT_OK;
goto exec_done;
}
while ((a = act) != NULL) {
repeat:
if (a->ops && a->ops->act) {
ret = a->ops->act(&skb, a);
if (TC_MUNGED & skb->tc_verd) {
/* copied already, allow trampling */
skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd);
}
if (ret == TC_ACT_REPEAT)
goto repeat; /* we need a ttl - JHS */
if (ret != TC_ACT_PIPE)
goto exec_done;
}
act = a->next;
}
exec_done:
if (skb->tc_classid > 0) {
res->classid =