/*
* net/sched/gact.c Generic actions
*
* 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.
*
* copyright Jamal Hadi Salim (2002-4)
*
*/
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/bitops.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/module.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <net/sock.h>
#include <net/pkt_sched.h>
#include <linux/tc_act/tc_gact.h>
#include <net/tc_act/tc_gact.h>
/* use generic hash table */
#define MY_TAB_SIZE 16
#define MY_TAB_MASK 15
static u32 idx_gen;
static struct tcf_gact *tcf_gact_ht[MY_TAB_SIZE];
static DEFINE_RWLOCK(gact_lock);
/* ovewrride the defaults */
#define tcf_st tcf_gact
#define tc_st tc_gact
#define tcf_t_lock gact_lock
#define tcf_ht tcf_gact_ht
#define CONFIG_NET_ACT_INIT 1
#include <net/pkt_act.h>
#ifdef CONFIG_GACT_PROB
static int gact_net_rand(struct tcf_gact *p)
{
if (net_random()%p->pval)
return p->action;
return p->paction;
}
static int gact_determ(struct tcf_gact *p)
{
if (p->bstats.packets%p->pval)
return p->action;
return p->paction;
}
typedef int (*g_rand)(struct tcf_gact *p);
static g_rand gact_rand[MAX_RAND]= { NULL, gact_net_rand, gact_determ };
#endif
static int tcf_gact_init(struct rtattr *rta, struct rtattr *est,
struct tc_action *a, int ovr, int bind)
{
struct rtattr *tb[TCA_GACT_MAX];
struct tc_gact *parm;
struct tcf_gact *p;
int ret = 0;
if (rta == NULL || rtattr_parse_nested(tb, TCA_GACT_MAX, rta) < 0)
return -EINVAL;
if (tb[TCA_GACT_PARMS - 1] == NULL ||
RTA_PAYLOAD(tb[TCA_GACT_PARMS - 1]) < sizeof(*parm))
return -EINVAL;
parm = RTA_DATA(tb[TCA_GACT_PARMS - 1]);
if (tb[TCA_GACT_PROB-1] != NULL)
#ifdef CONFIG_GACT_PROB
if (RTA_PAYLOAD(tb[TCA_GACT_PROB-1]) < sizeof(struct tc_gact_p))
return -EINVAL;
#else
return -EOPNOTSUPP;
#endif
p = tcf_hash_check(parm->index, a, ovr, bind);
if (p == NULL) {
p = tcf_hash_create(parm->index, est, a, sizeof(*p), ovr, bind);
if (p == NULL)
return -ENOMEM;
ret = ACT_P_CREATED;
} else {
if (!ovr) {
tcf_hash_release(p, bind);
return -EEXIST;
}
}
spin_lock_bh(&p->lock);
p->action = parm->action;
#ifdef CONFIG_GACT_PROB
if (tb[TCA_GACT_PROB-1] != NULL) {
struct tc_gact_p *p_parm = RTA_DATA(tb[TCA_GACT_PROB-1]);
p->paction = p_parm->paction;
p->pval = p_parm->pval;
p->ptype = p_parm->ptype;
}
#endif
spin_unlock_bh(&p->lock);
if (ret == ACT_P_CREATED)
tcf_hash_insert(p);
return ret;
}
static int
tcf_gact_cleanup(struct tc_action *a, int bind)
{
struct tcf_gact *p = PRIV(a, gact);
if (p != NULL)
return tcf_hash_release(p, bind);
return 0;
}
static int
tcf_gact(struct sk_buff *skb, struct tc_action *a, struct tcf_result *res)
{
struct tcf_gact *p = PRIV(a, gact);
int action = TC_ACT_SHOT;
spin_lock(&p->lock);
#ifdef CONFIG_GACT_PROB
if (p->ptype && gact_rand[p->ptype] != NULL)
action = gact_rand[p->ptype](p);
else
action = p->action;
#else
action = p->action;
#endif
p->bstats.bytes += skb->len;
p->bstats.packets++;
if (action == TC_ACT_SHOT)
p->qstats.drops++;
p->tm.lastuse = jiffies;
spin_unlock(&p->lock);
return action;
}
static int
tcf_gact_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
{
unsigned char *b = skb->tail;
struct tc_gact opt;
struct tcf_gact *p = PRIV(a, gact);
struct tcf_t t;
opt.index = p->index;
opt.refcnt = p->refcnt - ref;
opt.bindcnt = p->bindcnt - bind;
opt.action = p->action;
RTA_PUT(skb, TCA_GACT_PARMS, sizeof(opt), &opt);
#ifdef CONFIG_GACT_PROB
if (p->ptype) {
struct tc_gact_p p_opt;
p_opt.paction = p->paction;
p_opt.pval = p->pval;
p_opt.ptype = p->ptype;
RTA_PUT(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt);
}
#endif
t.install = jiffies_to_clock_t(jiffies - p->tm.install);
t.lastuse = jiffies_to_clock_t(jiffies - p->tm.lastuse);
t.expires = jiffies_to_clock_t(p->tm.expires);
RTA_PUT(skb, TCA_GACT_TM, sizeof(t), &t);
return skb->len;
rtattr_failure:
skb_trim(skb, b - skb->data);
return -1;
}
static struct tc_action_ops act_gact_ops = {
.kind = "gact",
.type = TCA_ACT_GACT,
.capab = TCA_CAP_NONE,
.owner = THIS_MODULE,
.act = tcf_gact,
.dump = tcf_gact_dump,
.cleanup = tcf_gact_cleanup,
.lookup = tcf_hash_search,
.init = tcf_gact_init,
.walk = tcf_generic_walker
};
MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
MODULE_DESCRIPTION("Generic Classifier actions");
MODULE_LICENSE("GPL");
static int __init
gact_init_module(void)
{
#ifdef CONFIG_GACT_PROB
printk("GACT probability on\n");
#else
printk("GACT probability NOT on\n");
#endif
return tcf_register_action(&act_gact_ops);
}
static void __exit
gact_cleanup_module(void)
{
tcf_unregister_action(&act_gact_ops);
}
module_init(gact_init_module);
module_exit(gact_cleanup_module);
