v4.19.13 snapshot.
diff --git a/net/sched/act_simple.c b/net/sched/act_simple.c
new file mode 100644
index 0000000..52400d4
--- /dev/null
+++ b/net/sched/act_simple.c
@@ -0,0 +1,249 @@
+/*
+ * 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>
+
+static unsigned int simp_net_id;
+static struct tc_action_ops act_simp_ops;
+
+#define SIMP_MAX_DATA 32
+static int tcf_simp_act(struct sk_buff *skb, const struct tc_action *a,
+ struct tcf_result *res)
+{
+ struct tcf_defact *d = to_defact(a);
+
+ spin_lock(&d->tcf_lock);
+ tcf_lastuse_update(&d->tcf_tm);
+ 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)
+{
+ struct tcf_defact *d = to_defact(a);
+ kfree(d->tcfd_defdata);
+}
+
+static int alloc_defdata(struct tcf_defact *d, const struct nlattr *defdata)
+{
+ d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL);
+ if (unlikely(!d->tcfd_defdata))
+ return -ENOMEM;
+ nla_strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
+ return 0;
+}
+
+static void reset_policy(struct tcf_defact *d, const struct nlattr *defdata,
+ struct tc_defact *p)
+{
+ spin_lock_bh(&d->tcf_lock);
+ d->tcf_action = p->action;
+ memset(d->tcfd_defdata, 0, SIMP_MAX_DATA);
+ nla_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, bool rtnl_held,
+ struct netlink_ext_ack *extack)
+{
+ struct tc_action_net *tn = net_generic(net, simp_net_id);
+ struct nlattr *tb[TCA_DEF_MAX + 1];
+ struct tc_defact *parm;
+ struct tcf_defact *d;
+ bool exists = false;
+ int ret = 0, err;
+
+ if (nla == NULL)
+ return -EINVAL;
+
+ err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy, NULL);
+ if (err < 0)
+ return err;
+
+ if (tb[TCA_DEF_PARMS] == NULL)
+ return -EINVAL;
+
+ parm = nla_data(tb[TCA_DEF_PARMS]);
+ err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
+ if (err < 0)
+ return err;
+ exists = err;
+ if (exists && bind)
+ return 0;
+
+ if (tb[TCA_DEF_DATA] == NULL) {
+ if (exists)
+ tcf_idr_release(*a, bind);
+ else
+ tcf_idr_cleanup(tn, parm->index);
+ return -EINVAL;
+ }
+
+ if (!exists) {
+ ret = tcf_idr_create(tn, parm->index, est, a,
+ &act_simp_ops, bind, false);
+ if (ret) {
+ tcf_idr_cleanup(tn, parm->index);
+ return ret;
+ }
+
+ d = to_defact(*a);
+ ret = alloc_defdata(d, tb[TCA_DEF_DATA]);
+ if (ret < 0) {
+ tcf_idr_release(*a, bind);
+ return ret;
+ }
+ d->tcf_action = parm->action;
+ ret = ACT_P_CREATED;
+ } else {
+ d = to_defact(*a);
+
+ if (!ovr) {
+ tcf_idr_release(*a, bind);
+ return -EEXIST;
+ }
+
+ reset_policy(d, tb[TCA_DEF_DATA], parm);
+ }
+
+ if (ret == ACT_P_CREATED)
+ tcf_idr_insert(tn, *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 = to_defact(a);
+ struct tc_defact opt = {
+ .index = d->tcf_index,
+ .refcnt = refcount_read(&d->tcf_refcnt) - ref,
+ .bindcnt = atomic_read(&d->tcf_bindcnt) - bind,
+ };
+ struct tcf_t t;
+
+ spin_lock_bh(&d->tcf_lock);
+ opt.action = d->tcf_action;
+ if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) ||
+ nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata))
+ goto nla_put_failure;
+
+ tcf_tm_dump(&t, &d->tcf_tm);
+ if (nla_put_64bit(skb, TCA_DEF_TM, sizeof(t), &t, TCA_DEF_PAD))
+ goto nla_put_failure;
+ spin_unlock_bh(&d->tcf_lock);
+
+ return skb->len;
+
+nla_put_failure:
+ spin_unlock_bh(&d->tcf_lock);
+ nlmsg_trim(skb, b);
+ return -1;
+}
+
+static int tcf_simp_walker(struct net *net, struct sk_buff *skb,
+ struct netlink_callback *cb, int type,
+ const struct tc_action_ops *ops,
+ struct netlink_ext_ack *extack)
+{
+ struct tc_action_net *tn = net_generic(net, simp_net_id);
+
+ return tcf_generic_walker(tn, skb, cb, type, ops, extack);
+}
+
+static int tcf_simp_search(struct net *net, struct tc_action **a, u32 index,
+ struct netlink_ext_ack *extack)
+{
+ struct tc_action_net *tn = net_generic(net, simp_net_id);
+
+ return tcf_idr_search(tn, a, index);
+}
+
+static struct tc_action_ops act_simp_ops = {
+ .kind = "simple",
+ .type = TCA_ACT_SIMP,
+ .owner = THIS_MODULE,
+ .act = tcf_simp_act,
+ .dump = tcf_simp_dump,
+ .cleanup = tcf_simp_release,
+ .init = tcf_simp_init,
+ .walk = tcf_simp_walker,
+ .lookup = tcf_simp_search,
+ .size = sizeof(struct tcf_defact),
+};
+
+static __net_init int simp_init_net(struct net *net)
+{
+ struct tc_action_net *tn = net_generic(net, simp_net_id);
+
+ return tc_action_net_init(tn, &act_simp_ops);
+}
+
+static void __net_exit simp_exit_net(struct list_head *net_list)
+{
+ tc_action_net_exit(net_list, simp_net_id);
+}
+
+static struct pernet_operations simp_net_ops = {
+ .init = simp_init_net,
+ .exit_batch = simp_exit_net,
+ .id = &simp_net_id,
+ .size = sizeof(struct tc_action_net),
+};
+
+MODULE_AUTHOR("Jamal Hadi Salim(2005)");
+MODULE_DESCRIPTION("Simple example action");
+MODULE_LICENSE("GPL");
+
+static int __init simp_init_module(void)
+{
+ int ret = tcf_register_action(&act_simp_ops, &simp_net_ops);
+ if (!ret)
+ pr_info("Simple TC action Loaded\n");
+ return ret;
+}
+
+static void __exit simp_cleanup_module(void)
+{
+ tcf_unregister_action(&act_simp_ops, &simp_net_ops);
+}
+
+module_init(simp_init_module);
+module_exit(simp_cleanup_module);