[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>

include/linux/tc_act/tc_defact.h

@@ -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

include/net/act_generic.h

@@ -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 */

include/net/tc_act/tc_defact.h

@@ -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