[PKT_SCHED]: Introduce simple actions.

And provide an example simply action in order to
demonstrate usage.

Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jamal Hadi Salim 2005-04-24 20:10:16 -07:00 committed by David S. Miller
parent ac6910e189
commit db75307979
6 changed files with 299 additions and 5 deletions

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@ -0,0 +1,21 @@
#ifndef __LINUX_TC_DEF_H
#define __LINUX_TC_DEF_H
#include <linux/pkt_cls.h>
struct tc_defact
{
tc_gen;
};
enum
{
TCA_DEF_UNSPEC,
TCA_DEF_TM,
TCA_DEF_PARMS,
TCA_DEF_DATA,
__TCA_DEF_MAX
};
#define TCA_DEF_MAX (__TCA_DEF_MAX - 1)
#endif

142
include/net/act_generic.h Normal file
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@ -0,0 +1,142 @@
/*
* include/net/act_generic.h
*
*/
#ifndef ACT_GENERIC_H
#define ACT_GENERIC_H
static inline int tcf_defact_release(struct tcf_defact *p, int bind)
{
int ret = 0;
if (p) {
if (bind) {
p->bindcnt--;
}
p->refcnt--;
if (p->bindcnt <= 0 && p->refcnt <= 0) {
kfree(p->defdata);
tcf_hash_destroy(p);
ret = 1;
}
}
return ret;
}
static inline int
alloc_defdata(struct tcf_defact *p, u32 datalen, void *defdata)
{
p->defdata = kmalloc(datalen, GFP_KERNEL);
if (p->defdata == NULL)
return -ENOMEM;
p->datalen = datalen;
memcpy(p->defdata, defdata, datalen);
return 0;
}
static inline int
realloc_defdata(struct tcf_defact *p, u32 datalen, void *defdata)
{
/* safer to be just brute force for now */
kfree(p->defdata);
return alloc_defdata(p, datalen, defdata);
}
static inline int
tcf_defact_init(struct rtattr *rta, struct rtattr *est,
struct tc_action *a, int ovr, int bind)
{
struct rtattr *tb[TCA_DEF_MAX];
struct tc_defact *parm;
struct tcf_defact *p;
void *defdata;
u32 datalen = 0;
int ret = 0;
if (rta == NULL || rtattr_parse_nested(tb, TCA_DEF_MAX, rta) < 0)
return -EINVAL;
if (tb[TCA_DEF_PARMS - 1] == NULL ||
RTA_PAYLOAD(tb[TCA_DEF_PARMS - 1]) < sizeof(*parm))
return -EINVAL;
parm = RTA_DATA(tb[TCA_DEF_PARMS - 1]);
defdata = RTA_DATA(tb[TCA_DEF_DATA - 1]);
if (defdata == NULL)
return -EINVAL;
datalen = RTA_PAYLOAD(tb[TCA_DEF_DATA - 1]);
if (datalen <= 0)
return -EINVAL;
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 = alloc_defdata(p, datalen, defdata);
if (ret < 0) {
kfree(p);
return ret;
}
ret = ACT_P_CREATED;
} else {
if (!ovr) {
tcf_defact_release(p, bind);
return -EEXIST;
}
realloc_defdata(p, datalen, defdata);
}
spin_lock_bh(&p->lock);
p->action = parm->action;
spin_unlock_bh(&p->lock);
if (ret == ACT_P_CREATED)
tcf_hash_insert(p);
return ret;
}
static inline int tcf_defact_cleanup(struct tc_action *a, int bind)
{
struct tcf_defact *p = PRIV(a, defact);
if (p != NULL)
return tcf_defact_release(p, bind);
return 0;
}
static inline int
tcf_defact_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
{
unsigned char *b = skb->tail;
struct tc_defact opt;
struct tcf_defact *p = PRIV(a, defact);
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_DEF_PARMS, sizeof(opt), &opt);
RTA_PUT(skb, TCA_DEF_DATA, p->datalen, p->defdata);
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_DEF_TM, sizeof(t), &t);
return skb->len;
rtattr_failure:
skb_trim(skb, b - skb->data);
return -1;
}
#define tca_use_default_ops \
.dump = tcf_defact_dump, \
.cleanup = tcf_defact_cleanup, \
.init = tcf_defact_init, \
.walk = tcf_generic_walker, \
#define tca_use_default_defines(name) \
static u32 idx_gen; \
static struct tcf_defact *tcf_##name_ht[MY_TAB_SIZE]; \
static DEFINE_RWLOCK(##name_lock);
#endif /* _NET_ACT_GENERIC_H */

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@ -0,0 +1,13 @@
#ifndef __NET_TC_DEF_H
#define __NET_TC_DEF_H
#include <net/act_api.h>
struct tcf_defact
{
tca_gen(defact);
u32 datalen;
void *defdata;
};
#endif

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@ -506,3 +506,13 @@ config NET_CLS_POLICE
Say Y to support traffic policing (bandwidth limits). Needed for
ingress and egress rate limiting.
config NET_ACT_SIMP
tristate "Simple action"
depends on NET_CLS_ACT
---help---
You must have new iproute2 to use this feature.
This adds a very simple action for demonstration purposes
The idea is to give action authors a basic example to look at.
All this action will do is print on the console the configured
policy string followed by _ then packet count.

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@ -6,13 +6,14 @@ obj-y := sch_generic.o
obj-$(CONFIG_NET_SCHED) += sch_api.o sch_fifo.o
obj-$(CONFIG_NET_CLS) += cls_api.o
obj-$(CONFIG_NET_CLS_ACT) += act_api.o
obj-$(CONFIG_NET_CLS_ACT) += act_api.o
obj-$(CONFIG_NET_ACT_POLICE) += police.o
obj-$(CONFIG_NET_CLS_POLICE) += police.o
obj-$(CONFIG_NET_ACT_GACT) += gact.o
obj-$(CONFIG_NET_ACT_MIRRED) += mirred.o
obj-$(CONFIG_NET_ACT_IPT) += ipt.o
obj-$(CONFIG_NET_ACT_PEDIT) += pedit.o
obj-$(CONFIG_NET_ACT_GACT) += gact.o
obj-$(CONFIG_NET_ACT_MIRRED) += mirred.o
obj-$(CONFIG_NET_ACT_IPT) += ipt.o
obj-$(CONFIG_NET_ACT_PEDIT) += pedit.o
obj-$(CONFIG_NET_ACT_SIMP) += simple.o
obj-$(CONFIG_NET_SCH_CBQ) += sch_cbq.o
obj-$(CONFIG_NET_SCH_HTB) += sch_htb.o
obj-$(CONFIG_NET_SCH_HPFQ) += sch_hpfq.o

107
net/sched/simple.c Normal file
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@ -0,0 +1,107 @@
/*
* net/sched/simp.c Simple example of an action
*
* 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.
*
* Authors: Jamal Hadi Salim (2005)
*
*/
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/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/module.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <net/sock.h>
#include <net/pkt_sched.h>
#define TCA_ACT_SIMP 22
/* XXX: Hide all these common elements under some macro
* probably
*/
#include <linux/tc_act/tc_defact.h>
#include <net/tc_act/tc_defact.h>
/* use generic hash table with 8 buckets */
#define MY_TAB_SIZE 8
#define MY_TAB_MASK (MY_TAB_SIZE - 1)
static u32 idx_gen;
static struct tcf_defact *tcf_simp_ht[MY_TAB_SIZE];
static DEFINE_RWLOCK(simp_lock);
/* override the defaults */
#define tcf_st tcf_defact
#define tc_st tc_defact
#define tcf_t_lock simp_lock
#define tcf_ht tcf_simp_ht
#define CONFIG_NET_ACT_INIT 1
#include <net/pkt_act.h>
#include <net/act_generic.h>
static int tcf_simp(struct sk_buff **pskb, struct tc_action *a)
{
struct sk_buff *skb = *pskb;
struct tcf_defact *p = PRIV(a, defact);
spin_lock(&p->lock);
p->tm.lastuse = jiffies;
p->bstats.bytes += skb->len;
p->bstats.packets++;
/* print policy string followed by _ then packet count
* Example if this was the 3rd packet and the string was "hello"
* then it would look like "hello_3" (without quotes)
**/
printk("simple: %s_%d\n", (char *)p->defdata, p->bstats.packets);
spin_unlock(&p->lock);
return p->action;
}
static struct tc_action_ops act_simp_ops = {
.kind = "simple",
.type = TCA_ACT_SIMP,
.capab = TCA_CAP_NONE,
.owner = THIS_MODULE,
.act = tcf_simp,
tca_use_default_ops
};
MODULE_AUTHOR("Jamal Hadi Salim(2005)");
MODULE_DESCRIPTION("Simple example action");
MODULE_LICENSE("GPL");
static int __init simp_init_module(void)
{
int ret = tcf_register_action(&act_simp_ops);
if (!ret)
printk("Simple TC action Loaded\n");
return ret;
}
static void __exit simp_cleanup_module(void)
{
tcf_unregister_action(&act_simp_ops);
}
module_init(simp_init_module);
module_exit(simp_cleanup_module);