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/*
* 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 <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <linux/module.h>
#include <linux/init.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>
#include <linux/tc_act/tc_gact.h>
#include <net/tc_act/tc_gact.h>
#define GACT_TAB_MASK 15
static struct tcf_common *tcf_gact_ht[GACT_TAB_MASK + 1];
static u32 gact_idx_gen;
static DEFINE_RWLOCK(gact_lock);
static struct tcf_hashinfo gact_hash_info = {
.htab = tcf_gact_ht,
.hmask = GACT_TAB_MASK,
.lock = &gact_lock,
};
#ifdef CONFIG_GACT_PROB
static int gact_net_rand(struct tcf_gact *gact)
{
if (!gact->tcfg_pval || net_random() % gact->tcfg_pval)
return gact->tcf_action;
return gact->tcfg_paction;
}
static int gact_determ(struct tcf_gact *gact)
{
if (!gact->tcfg_pval || gact->tcf_bstats.packets % gact->tcfg_pval)
return gact->tcf_action;
return gact->tcfg_paction;
}
typedef int (*g_rand)(struct tcf_gact *gact);
static g_rand gact_rand[MAX_RAND]= { NULL, gact_net_rand, gact_determ };
#endif /* CONFIG_GACT_PROB */
static int tcf_gact_init(struct nlattr *nla, struct nlattr *est,
struct tc_action *a, int ovr, int bind)
{
struct nlattr *tb[TCA_GACT_MAX + 1];
struct tc_gact *parm;
struct tcf_gact *gact;
struct tcf_common *pc;
int ret = 0;
if (nla == NULL || nla_parse_nested(tb, TCA_GACT_MAX, nla, NULL) < 0)
return -EINVAL;
if (tb[TCA_GACT_PARMS] == NULL ||
nla_len(tb[TCA_GACT_PARMS]) < sizeof(*parm))
return -EINVAL;
parm = nla_data(tb[TCA_GACT_PARMS]);
if (tb[TCA_GACT_PROB] != NULL)
#ifdef CONFIG_GACT_PROB
if (nla_len(tb[TCA_GACT_PROB]) < sizeof(struct tc_gact_p))
return -EINVAL;
#else
return -EOPNOTSUPP;
#endif
pc = tcf_hash_check(parm->index, a, bind, &gact_hash_info);
if (!pc) {
pc = tcf_hash_create(parm->index, est, a, sizeof(*gact),
bind, &gact_idx_gen, &gact_hash_info);
if (unlikely(!pc))
return -ENOMEM;
ret = ACT_P_CREATED;
} else {
if (!ovr) {
tcf_hash_release(pc, bind, &gact_hash_info);
return -EEXIST;
}
}
gact = to_gact(pc);
spin_lock_bh(&gact->tcf_lock);
gact->tcf_action = parm->action;
#ifdef CONFIG_GACT_PROB
if (tb[TCA_GACT_PROB] != NULL) {
struct tc_gact_p *p_parm = nla_data(tb[TCA_GACT_PROB]);
gact->tcfg_paction = p_parm->paction;
gact->tcfg_pval = p_parm->pval;
gact->tcfg_ptype = p_parm->ptype;
}
#endif
spin_unlock_bh(&gact->tcf_lock);
if (ret == ACT_P_CREATED)
tcf_hash_insert(pc, &gact_hash_info);
return ret;
}
static int tcf_gact_cleanup(struct tc_action *a, int bind)
{
struct tcf_gact *gact = a->priv;
if (gact)
return tcf_hash_release(&gact->common, bind, &gact_hash_info);
return 0;
}
static int tcf_gact(struct sk_buff *skb, struct tc_action *a, struct tcf_result *res)
{
struct tcf_gact *gact = a->priv;
int action = TC_ACT_SHOT;
spin_lock(&gact->tcf_lock);
#ifdef CONFIG_GACT_PROB
if (gact->tcfg_ptype && gact_rand[gact->tcfg_ptype] != NULL)
action = gact_rand[gact->tcfg_ptype](gact);
else
action = gact->tcf_action;
#else
action = gact->tcf_action;
#endif
gact->tcf_bstats.bytes += skb->len;
gact->tcf_bstats.packets++;
if (action == TC_ACT_SHOT)
gact->tcf_qstats.drops++;
gact->tcf_tm.lastuse = jiffies;
spin_unlock(&gact->tcf_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_pointer(skb);
struct tc_gact opt;
struct tcf_gact *gact = a->priv;
struct tcf_t t;
opt.index = gact->tcf_index;
opt.refcnt = gact->tcf_refcnt - ref;
opt.bindcnt = gact->tcf_bindcnt - bind;
opt.action = gact->tcf_action;
NLA_PUT(skb, TCA_GACT_PARMS, sizeof(opt), &opt);
#ifdef CONFIG_GACT_PROB
if (gact->tcfg_ptype) {
struct tc_gact_p p_opt;
p_opt.paction = gact->tcfg_paction;
p_opt.pval = gact->tcfg_pval;
p_opt.ptype = gact->tcfg_ptype;
NLA_PUT(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt);
}
#endif
t.install = jiffies_to_clock_t(jiffies - gact->tcf_tm.install);
t.lastuse = jiffies_to_clock_t(jiffies - gact->tcf_tm.lastuse);
t.expires = jiffies_to_clock_t(gact->tcf_tm.expires);
NLA_PUT(skb, TCA_GACT_TM, sizeof(t), &t);
return skb->len;
nla_put_failure:
nlmsg_trim(skb, b);
return -1;
}
static struct tc_action_ops act_gact_ops = {
.kind = "gact",
.hinfo = &gact_hash_info,
.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);
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