1 files changed, 222 insertions, 0 deletions
diff --git a/net/sched/act_gact.c b/net/sched/act_gact.c
new file mode 100644
index 00000000..b77f5a06
--- /dev/null
+++ b/net/sched/act_gact.c
@@ -0,0 +1,222 @@
+/*
+ * 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 const struct nla_policy gact_policy[TCA_GACT_MAX + 1] = {
+	[TCA_GACT_PARMS]	= { .len = sizeof(struct tc_gact) },
+	[TCA_GACT_PROB]		= { .len = sizeof(struct tc_gact_p) },
+};
+
+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;
+	int err;
+
+	if (nla == NULL)
+		return -EINVAL;
+
+	err = nla_parse_nested(tb, TCA_GACT_MAX, nla, gact_policy);
+	if (err < 0)
+		return err;
+
+	if (tb[TCA_GACT_PARMS] == NULL)
+		return -EINVAL;
+	parm = nla_data(tb[TCA_GACT_PARMS]);
+
+#ifndef CONFIG_GACT_PROB
+	if (tb[TCA_GACT_PROB] != NULL)
+		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 (IS_ERR(pc))
+			return PTR_ERR(pc);
+		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, const 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 += qdisc_pkt_len(skb);
+	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 tcf_gact *gact = a->priv;
+	struct tc_gact opt = {
+		.index   = gact->tcf_index,
+		.refcnt  = gact->tcf_refcnt - ref,
+		.bindcnt = gact->tcf_bindcnt - bind,
+		.action  = gact->tcf_action,
+	};
+	struct tcf_t t;
+
+	NLA_PUT(skb, TCA_GACT_PARMS, sizeof(opt), &opt);
+#ifdef CONFIG_GACT_PROB
+	if (gact->tcfg_ptype) {
+		struct tc_gact_p p_opt = {
+			.paction = gact->tcfg_paction,
+			.pval    = gact->tcfg_pval,
+			.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
+	pr_info("GACT probability on\n");
+#else
+	pr_info("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);