1 files changed, 231 insertions, 0 deletions
diff --git a/net/sched/gact.c b/net/sched/gact.c
new file mode 100644
index 00000000000..a811c89fef7
--- /dev/null
+++ b/net/sched/gact.c
@@ -0,0 +1,231 @@
+/*
+ * 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/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 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 **pskb, struct tc_action *a)
+{
+	struct tcf_gact *p = PRIV(a, gact);
+	struct sk_buff *skb = *pskb;
+	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);