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-rw-r--r--kernel/net/sched/act_gact.c209
1 files changed, 209 insertions, 0 deletions
diff --git a/kernel/net/sched/act_gact.c b/kernel/net/sched/act_gact.c
new file mode 100644
index 000000000..7fffc2272
--- /dev/null
+++ b/kernel/net/sched/act_gact.c
@@ -0,0 +1,209 @@
+/*
+ * net/sched/act_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
+
+#ifdef CONFIG_GACT_PROB
+static int gact_net_rand(struct tcf_gact *gact)
+{
+ if (!gact->tcfg_pval || prandom_u32() % 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 net *net, 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;
+ int ret = 0;
+ int err;
+#ifdef CONFIG_GACT_PROB
+ struct tc_gact_p *p_parm = NULL;
+#endif
+
+ 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;
+#else
+ if (tb[TCA_GACT_PROB]) {
+ p_parm = nla_data(tb[TCA_GACT_PROB]);
+ if (p_parm->ptype >= MAX_RAND)
+ return -EINVAL;
+ }
+#endif
+
+ if (!tcf_hash_check(parm->index, a, bind)) {
+ ret = tcf_hash_create(parm->index, est, a, sizeof(*gact), bind);
+ if (ret)
+ return ret;
+ ret = ACT_P_CREATED;
+ } else {
+ if (bind)/* dont override defaults */
+ return 0;
+ tcf_hash_release(a, bind);
+ if (!ovr)
+ return -EEXIST;
+ }
+
+ gact = to_gact(a);
+
+ spin_lock_bh(&gact->tcf_lock);
+ gact->tcf_action = parm->action;
+#ifdef CONFIG_GACT_PROB
+ if (p_parm) {
+ 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(a);
+ return ret;
+}
+
+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)
+ 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;
+
+ if (nla_put(skb, TCA_GACT_PARMS, sizeof(opt), &opt))
+ goto nla_put_failure;
+#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,
+ };
+
+ if (nla_put(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt))
+ goto nla_put_failure;
+ }
+#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);
+ if (nla_put(skb, TCA_GACT_TM, sizeof(t), &t))
+ goto nla_put_failure;
+ return skb->len;
+
+nla_put_failure:
+ nlmsg_trim(skb, b);
+ return -1;
+}
+
+static struct tc_action_ops act_gact_ops = {
+ .kind = "gact",
+ .type = TCA_ACT_GACT,
+ .owner = THIS_MODULE,
+ .act = tcf_gact,
+ .dump = tcf_gact_dump,
+ .init = tcf_gact_init,
+};
+
+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, GACT_TAB_MASK);
+}
+
+static void __exit gact_cleanup_module(void)
+{
+ tcf_unregister_action(&act_gact_ops);
+}
+
+module_init(gact_init_module);
+module_exit(gact_cleanup_module);