[PKT_SCHED]: Add gact generic actions.

Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/tc_act/tc_gact.h

+#ifndef __LINUX_TC_GACT_H
+#define __LINUX_TC_GACT_H
+
+#include <linux/pkt_cls.h>
+
+#define TCA_ACT_GACT 5
+struct tc_gact
+{
+	tc_gen;
+
+};
+
+struct tc_gact_p
+{
+#define PGACT_NONE              0
+#define PGACT_NETRAND           1
+#define PGACT_DETERM            2
+#define MAX_RAND                (PGACT_DETERM + 1 )
+	__u16                 ptype;
+	__u16                 pval;
+	int                   paction;
+};
+ 
+enum
+{
+	TCA_GACT_UNSPEC,
+	TCA_GACT_TM,
+	TCA_GACT_PARMS,
+	TCA_GACT_PROB,
+	__TCA_GACT_MAX
+};
+#define TCA_GACT_MAX (__TCA_GACT_MAX - 1)
+ 
+#endif

include/net/tc_act/tc_gact.h

+#ifndef __NET_TC_GACT_H
+#define __NET_TC_GACT_H
+
+#include <net/pkt_sched.h>
+
+struct tcf_gact
+{
+        tca_gen(gact);
+#ifdef CONFIG_GACT_PROB
+        u16                 ptype;
+        u16                 pval;
+        int                 paction;
+#endif
+                                                                                
+};
+                                                                                
+#endif

net/sched/Kconfig

@@ -387,3 +387,15 @@ config NET_CLS_POLICE
 	  Say Y to support traffic policing (bandwidth limits).  Needed for
 	  ingress and egress rate limiting.
 
+config NET_ACT_GACT
+        tristate '      generic Actions'
+        depends on NET_CLS_ACT
+        ---help---
+        You must have new iproute2 to use this feature
+        This adds simple filtering actions like drop,accepet etc 
+                                                                                
+config GACT_PROB
+        bool '         generic Actions probability'
+        depends on NET_ACT_GACT
+        ---help---
+        Allows generic actions to be randomly  or deterministically used

net/sched/Makefile

@@ -10,6 +10,7 @@ obj-$(CONFIG_NET_CLS)		+= cls_api.o
 obj-$(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_SCH_CBQ)	+= sch_cbq.o
 obj-$(CONFIG_NET_SCH_HTB)	+= sch_htb.o
 obj-$(CONFIG_NET_SCH_HPFQ)	+= sch_hpfq.o

net/sched/gact.c

+/*
+ * 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 <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>
+#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 rwlock_t gact_lock = RW_LOCK_UNLOCKED;
+
+/* 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
+typedef int (*g_rand)(struct tcf_gact *p);
+int
+gact_net_rand(struct tcf_gact *p) {
+	if (net_random()%p->pval)
+		return p->action;
+	return p->paction;
+}
+
+int
+gact_determ(struct tcf_gact *p) {
+	if (p->stats.packets%p->pval)
+		return p->action;
+	return p->paction;
+}
+
+
+g_rand gact_rand[MAX_RAND]= { NULL,gact_net_rand, gact_determ};
+
+#endif
+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 = NULL;
+	struct tc_gact_p *p_parm = NULL;
+	struct tcf_gact *p = NULL;
+	int ret = 0;
+	int size = sizeof (*p);
+
+	if (rtattr_parse(tb, TCA_GACT_MAX, RTA_DATA(rta), RTA_PAYLOAD(rta)) < 0)
+		return -1;
+
+	if (NULL == a || NULL == tb[TCA_GACT_PARMS - 1]) {
+		printk("BUG: tcf_gact_init called with NULL params\n");
+		return -1;
+	}
+
+	parm = RTA_DATA(tb[TCA_GACT_PARMS - 1]);
+#ifdef CONFIG_GACT_PROB
+	if (NULL != tb[TCA_GACT_PROB - 1]) {
+		p_parm = RTA_DATA(tb[TCA_GACT_PROB - 1]);
+	}
+#endif
+
+	p = tcf_hash_check(parm, a, ovr, bind);
+
+	if (NULL == p) {
+		p = tcf_hash_create(parm,est,a,size,ovr, bind);
+
+		if (NULL == p) {
+			return -1;
+		} else {
+			p->refcnt = 1;
+			ret = 1;
+			goto override;
+		}
+	}
+
+	if (ovr) {
+override:
+		p->action = parm->action;
+#ifdef CONFIG_GACT_PROB
+		if (NULL != p_parm) {
+			p->paction = p_parm->paction;
+			p->pval = p_parm->pval;
+			p->ptype = p_parm->ptype;
+		} else {
+			p->paction = p->pval = p->ptype = 0;
+		}
+#endif
+	}
+
+	return ret;
+}
+
+int
+tcf_gact_cleanup(struct tc_action *a, int bind)
+{
+	struct tcf_gact *p;
+	p = PRIV(a,gact);
+	if (NULL != p)
+		return tcf_hash_release(p, bind);
+	return 0;
+}
+
+int
+tcf_gact(struct sk_buff **pskb, struct tc_action *a)
+{
+	struct tcf_gact *p;
+	struct sk_buff *skb = *pskb;
+	int action = TC_ACT_SHOT;
+
+	p = PRIV(a,gact);
+
+	if (NULL == p) {
+		if (net_ratelimit())
+			printk("BUG: tcf_gact called with NULL params\n");
+		return -1;
+	}
+
+	spin_lock(&p->lock);
+#ifdef CONFIG_GACT_PROB
+	if (p->ptype && NULL != gact_rand[p->ptype])
+		action = gact_rand[p->ptype](p);
+	else
+		action = p->action;
+#else
+	action = p->action;
+#endif
+	p->stats.bytes += skb->len;
+	p->stats.packets++;
+	if (TC_ACT_SHOT == action)
+		p->stats.drops++;
+	p->tm.lastuse = jiffies;
+	spin_unlock(&p->lock);
+
+	return action;
+}
+
+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 tc_gact_p p_opt;
+	struct tcf_gact *p;
+	struct tcf_t t;
+
+	p = PRIV(a,gact);
+	if (NULL == p) {
+		printk("BUG: tcf_gact_dump called with NULL params\n");
+		goto rtattr_failure;
+	}
+
+	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) {
+		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 - p->tm.install;
+	t.lastuse = jiffies - p->tm.lastuse;
+	t.expires = 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;
+}
+
+int
+tcf_gact_stats(struct sk_buff *skb, struct tc_action *a)
+{
+	struct tcf_gact *p;
+	p = PRIV(a,gact);
+	if (NULL != p)
+		return qdisc_copy_stats(skb, &p->stats,p->stats_lock);
+
+	return 1;
+}
+
+struct tc_action_ops act_gact_ops = {
+	.next		=	NULL,
+	.kind		=	"gact",
+	.type		=	TCA_ACT_GACT,
+	.capab		=	TCA_CAP_NONE,
+	.owner		=	THIS_MODULE,
+	.act		=	tcf_gact,
+	.get_stats	=	tcf_gact_stats,
+	.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);