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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /net/sched/act_simple.c
Initial import
Diffstat (limited to 'net/sched/act_simple.c')
-rw-r--r--net/sched/act_simple.c192
1 files changed, 192 insertions, 0 deletions
diff --git a/net/sched/act_simple.c b/net/sched/act_simple.c
new file mode 100644
index 000000000..6a8d94886
--- /dev/null
+++ b/net/sched/act_simple.c
@@ -0,0 +1,192 @@
+/*
+ * net/sched/act_simple.c Simple example of an action
+ *
+ * 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.
+ *
+ * Authors: Jamal Hadi Salim (2005-8)
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/skbuff.h>
+#include <linux/rtnetlink.h>
+#include <net/netlink.h>
+#include <net/pkt_sched.h>
+
+#define TCA_ACT_SIMP 22
+
+#include <linux/tc_act/tc_defact.h>
+#include <net/tc_act/tc_defact.h>
+
+#define SIMP_TAB_MASK 7
+
+#define SIMP_MAX_DATA 32
+static int tcf_simp(struct sk_buff *skb, const struct tc_action *a,
+ struct tcf_result *res)
+{
+ struct tcf_defact *d = a->priv;
+
+ spin_lock(&d->tcf_lock);
+ d->tcf_tm.lastuse = jiffies;
+ bstats_update(&d->tcf_bstats, skb);
+
+ /* print policy string followed by _ then packet count
+ * Example if this was the 3rd packet and the string was "hello"
+ * then it would look like "hello_3" (without quotes)
+ */
+ pr_info("simple: %s_%d\n",
+ (char *)d->tcfd_defdata, d->tcf_bstats.packets);
+ spin_unlock(&d->tcf_lock);
+ return d->tcf_action;
+}
+
+static void tcf_simp_release(struct tc_action *a, int bind)
+{
+ struct tcf_defact *d = to_defact(a);
+ kfree(d->tcfd_defdata);
+}
+
+static int alloc_defdata(struct tcf_defact *d, char *defdata)
+{
+ d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL);
+ if (unlikely(!d->tcfd_defdata))
+ return -ENOMEM;
+ strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
+ return 0;
+}
+
+static void reset_policy(struct tcf_defact *d, char *defdata,
+ struct tc_defact *p)
+{
+ spin_lock_bh(&d->tcf_lock);
+ d->tcf_action = p->action;
+ memset(d->tcfd_defdata, 0, SIMP_MAX_DATA);
+ strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
+ spin_unlock_bh(&d->tcf_lock);
+}
+
+static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = {
+ [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) },
+ [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA },
+};
+
+static int tcf_simp_init(struct net *net, struct nlattr *nla,
+ struct nlattr *est, struct tc_action *a,
+ int ovr, int bind)
+{
+ struct nlattr *tb[TCA_DEF_MAX + 1];
+ struct tc_defact *parm;
+ struct tcf_defact *d;
+ char *defdata;
+ int ret = 0, err;
+
+ if (nla == NULL)
+ return -EINVAL;
+
+ err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy);
+ if (err < 0)
+ return err;
+
+ if (tb[TCA_DEF_PARMS] == NULL)
+ return -EINVAL;
+
+ if (tb[TCA_DEF_DATA] == NULL)
+ return -EINVAL;
+
+ parm = nla_data(tb[TCA_DEF_PARMS]);
+ defdata = nla_data(tb[TCA_DEF_DATA]);
+
+ if (!tcf_hash_check(parm->index, a, bind)) {
+ ret = tcf_hash_create(parm->index, est, a, sizeof(*d), bind);
+ if (ret)
+ return ret;
+
+ d = to_defact(a);
+ ret = alloc_defdata(d, defdata);
+ if (ret < 0) {
+ tcf_hash_cleanup(a, est);
+ return ret;
+ }
+ d->tcf_action = parm->action;
+ ret = ACT_P_CREATED;
+ } else {
+ d = to_defact(a);
+
+ if (bind)
+ return 0;
+ tcf_hash_release(a, bind);
+ if (!ovr)
+ return -EEXIST;
+
+ reset_policy(d, defdata, parm);
+ }
+
+ if (ret == ACT_P_CREATED)
+ tcf_hash_insert(a);
+ return ret;
+}
+
+static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a,
+ int bind, int ref)
+{
+ unsigned char *b = skb_tail_pointer(skb);
+ struct tcf_defact *d = a->priv;
+ struct tc_defact opt = {
+ .index = d->tcf_index,
+ .refcnt = d->tcf_refcnt - ref,
+ .bindcnt = d->tcf_bindcnt - bind,
+ .action = d->tcf_action,
+ };
+ struct tcf_t t;
+
+ if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) ||
+ nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata))
+ goto nla_put_failure;
+ t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install);
+ t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse);
+ t.expires = jiffies_to_clock_t(d->tcf_tm.expires);
+ if (nla_put(skb, TCA_DEF_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_simp_ops = {
+ .kind = "simple",
+ .type = TCA_ACT_SIMP,
+ .owner = THIS_MODULE,
+ .act = tcf_simp,
+ .dump = tcf_simp_dump,
+ .cleanup = tcf_simp_release,
+ .init = tcf_simp_init,
+};
+
+MODULE_AUTHOR("Jamal Hadi Salim(2005)");
+MODULE_DESCRIPTION("Simple example action");
+MODULE_LICENSE("GPL");
+
+static int __init simp_init_module(void)
+{
+ int ret;
+ ret = tcf_register_action(&act_simp_ops, SIMP_TAB_MASK);
+ if (!ret)
+ pr_info("Simple TC action Loaded\n");
+ return ret;
+}
+
+static void __exit simp_cleanup_module(void)
+{
+ tcf_unregister_action(&act_simp_ops);
+}
+
+module_init(simp_init_module);
+module_exit(simp_cleanup_module);