1 files changed, 338 insertions, 0 deletions
diff --git a/net/sched/act_gact.c b/net/sched/act_gact.c
new file mode 100644
index 000000000..62d682b96
--- /dev/null
+++ b/net/sched/act_gact.c
@@ -0,0 +1,338 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * net/sched/act_gact.c		Generic actions
+ *
+ * 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 <net/pkt_cls.h>
+#include <linux/tc_act/tc_gact.h>
+#include <net/tc_act/tc_gact.h>
+
+static struct tc_action_ops act_gact_ops;
+
+#ifdef CONFIG_GACT_PROB
+static int gact_net_rand(struct tcf_gact *gact)
+{
+	smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
+	if (prandom_u32_max(gact->tcfg_pval))
+		return gact->tcf_action;
+	return gact->tcfg_paction;
+}
+
+static int gact_determ(struct tcf_gact *gact)
+{
+	u32 pack = atomic_inc_return(&gact->packets);
+
+	smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
+	if (pack % 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,
+			 struct tcf_proto *tp, u32 flags,
+			 struct netlink_ext_ack *extack)
+{
+	struct tc_action_net *tn = net_generic(net, act_gact_ops.net_id);
+	bool bind = flags & TCA_ACT_FLAGS_BIND;
+	struct nlattr *tb[TCA_GACT_MAX + 1];
+	struct tcf_chain *goto_ch = NULL;
+	struct tc_gact *parm;
+	struct tcf_gact *gact;
+	int ret = 0;
+	u32 index;
+	int err;
+#ifdef CONFIG_GACT_PROB
+	struct tc_gact_p *p_parm = NULL;
+#endif
+
+	if (nla == NULL)
+		return -EINVAL;
+
+	err = nla_parse_nested_deprecated(tb, TCA_GACT_MAX, nla, gact_policy,
+					  NULL);
+	if (err < 0)
+		return err;
+
+	if (tb[TCA_GACT_PARMS] == NULL)
+		return -EINVAL;
+	parm = nla_data(tb[TCA_GACT_PARMS]);
+	index = parm->index;
+
+#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;
+		if (TC_ACT_EXT_CMP(p_parm->paction, TC_ACT_GOTO_CHAIN)) {
+			NL_SET_ERR_MSG(extack,
+				       "goto chain not allowed on fallback");
+			return -EINVAL;
+		}
+	}
+#endif
+
+	err = tcf_idr_check_alloc(tn, &index, a, bind);
+	if (!err) {
+		ret = tcf_idr_create_from_flags(tn, index, est, a,
+						&act_gact_ops, bind, flags);
+		if (ret) {
+			tcf_idr_cleanup(tn, index);
+			return ret;
+		}
+		ret = ACT_P_CREATED;
+	} else if (err > 0) {
+		if (bind)/* dont override defaults */
+			return 0;
+		if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
+			tcf_idr_release(*a, bind);
+			return -EEXIST;
+		}
+	} else {
+		return err;
+	}
+
+	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
+	if (err < 0)
+		goto release_idr;
+	gact = to_gact(*a);
+
+	spin_lock_bh(&gact->tcf_lock);
+	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
+#ifdef CONFIG_GACT_PROB
+	if (p_parm) {
+		gact->tcfg_paction = p_parm->paction;
+		gact->tcfg_pval    = max_t(u16, 1, p_parm->pval);
+		/* Make sure tcfg_pval is written before tcfg_ptype
+		 * coupled with smp_rmb() in gact_net_rand() & gact_determ()
+		 */
+		smp_wmb();
+		gact->tcfg_ptype   = p_parm->ptype;
+	}
+#endif
+	spin_unlock_bh(&gact->tcf_lock);
+
+	if (goto_ch)
+		tcf_chain_put_by_act(goto_ch);
+
+	return ret;
+release_idr:
+	tcf_idr_release(*a, bind);
+	return err;
+}
+
+static int tcf_gact_act(struct sk_buff *skb, const struct tc_action *a,
+			struct tcf_result *res)
+{
+	struct tcf_gact *gact = to_gact(a);
+	int action = READ_ONCE(gact->tcf_action);
+
+#ifdef CONFIG_GACT_PROB
+	{
+	u32 ptype = READ_ONCE(gact->tcfg_ptype);
+
+	if (ptype)
+		action = gact_rand[ptype](gact);
+	}
+#endif
+	tcf_action_update_bstats(&gact->common, skb);
+	if (action == TC_ACT_SHOT)
+		tcf_action_inc_drop_qstats(&gact->common);
+
+	tcf_lastuse_update(&gact->tcf_tm);
+
+	return action;
+}
+
+static void tcf_gact_stats_update(struct tc_action *a, u64 bytes, u64 packets,
+				  u64 drops, u64 lastuse, bool hw)
+{
+	struct tcf_gact *gact = to_gact(a);
+	int action = READ_ONCE(gact->tcf_action);
+	struct tcf_t *tm = &gact->tcf_tm;
+
+	tcf_action_update_stats(a, bytes, packets,
+				action == TC_ACT_SHOT ? packets : drops, hw);
+	tm->lastuse = max_t(u64, tm->lastuse, lastuse);
+}
+
+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 = to_gact(a);
+	struct tc_gact opt = {
+		.index   = gact->tcf_index,
+		.refcnt  = refcount_read(&gact->tcf_refcnt) - ref,
+		.bindcnt = atomic_read(&gact->tcf_bindcnt) - bind,
+	};
+	struct tcf_t t;
+
+	spin_lock_bh(&gact->tcf_lock);
+	opt.action = gact->tcf_action;
+	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
+	tcf_tm_dump(&t, &gact->tcf_tm);
+	if (nla_put_64bit(skb, TCA_GACT_TM, sizeof(t), &t, TCA_GACT_PAD))
+		goto nla_put_failure;
+	spin_unlock_bh(&gact->tcf_lock);
+
+	return skb->len;
+
+nla_put_failure:
+	spin_unlock_bh(&gact->tcf_lock);
+	nlmsg_trim(skb, b);
+	return -1;
+}
+
+static size_t tcf_gact_get_fill_size(const struct tc_action *act)
+{
+	size_t sz = nla_total_size(sizeof(struct tc_gact)); /* TCA_GACT_PARMS */
+
+#ifdef CONFIG_GACT_PROB
+	if (to_gact(act)->tcfg_ptype)
+		/* TCA_GACT_PROB */
+		sz += nla_total_size(sizeof(struct tc_gact_p));
+#endif
+
+	return sz;
+}
+
+static int tcf_gact_offload_act_setup(struct tc_action *act, void *entry_data,
+				      u32 *index_inc, bool bind,
+				      struct netlink_ext_ack *extack)
+{
+	if (bind) {
+		struct flow_action_entry *entry = entry_data;
+
+		if (is_tcf_gact_ok(act)) {
+			entry->id = FLOW_ACTION_ACCEPT;
+		} else if (is_tcf_gact_shot(act)) {
+			entry->id = FLOW_ACTION_DROP;
+		} else if (is_tcf_gact_trap(act)) {
+			entry->id = FLOW_ACTION_TRAP;
+		} else if (is_tcf_gact_goto_chain(act)) {
+			entry->id = FLOW_ACTION_GOTO;
+			entry->chain_index = tcf_gact_goto_chain_index(act);
+		} else if (is_tcf_gact_continue(act)) {
+			NL_SET_ERR_MSG_MOD(extack, "Offload of \"continue\" action is not supported");
+			return -EOPNOTSUPP;
+		} else if (is_tcf_gact_reclassify(act)) {
+			NL_SET_ERR_MSG_MOD(extack, "Offload of \"reclassify\" action is not supported");
+			return -EOPNOTSUPP;
+		} else if (is_tcf_gact_pipe(act)) {
+			NL_SET_ERR_MSG_MOD(extack, "Offload of \"pipe\" action is not supported");
+			return -EOPNOTSUPP;
+		} else {
+			NL_SET_ERR_MSG_MOD(extack, "Unsupported generic action offload");
+			return -EOPNOTSUPP;
+		}
+		*index_inc = 1;
+	} else {
+		struct flow_offload_action *fl_action = entry_data;
+
+		if (is_tcf_gact_ok(act))
+			fl_action->id = FLOW_ACTION_ACCEPT;
+		else if (is_tcf_gact_shot(act))
+			fl_action->id = FLOW_ACTION_DROP;
+		else if (is_tcf_gact_trap(act))
+			fl_action->id = FLOW_ACTION_TRAP;
+		else if (is_tcf_gact_goto_chain(act))
+			fl_action->id = FLOW_ACTION_GOTO;
+		else
+			return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static struct tc_action_ops act_gact_ops = {
+	.kind		=	"gact",
+	.id		=	TCA_ID_GACT,
+	.owner		=	THIS_MODULE,
+	.act		=	tcf_gact_act,
+	.stats_update	=	tcf_gact_stats_update,
+	.dump		=	tcf_gact_dump,
+	.init		=	tcf_gact_init,
+	.get_fill_size	=	tcf_gact_get_fill_size,
+	.offload_act_setup =	tcf_gact_offload_act_setup,
+	.size		=	sizeof(struct tcf_gact),
+};
+
+static __net_init int gact_init_net(struct net *net)
+{
+	struct tc_action_net *tn = net_generic(net, act_gact_ops.net_id);
+
+	return tc_action_net_init(net, tn, &act_gact_ops);
+}
+
+static void __net_exit gact_exit_net(struct list_head *net_list)
+{
+	tc_action_net_exit(net_list, act_gact_ops.net_id);
+}
+
+static struct pernet_operations gact_net_ops = {
+	.init = gact_init_net,
+	.exit_batch = gact_exit_net,
+	.id   = &act_gact_ops.net_id,
+	.size = sizeof(struct tc_action_net),
+};
+
+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_net_ops);
+}
+
+static void __exit gact_cleanup_module(void)
+{
+	tcf_unregister_action(&act_gact_ops, &gact_net_ops);
+}
+
+module_init(gact_init_module);
+module_exit(gact_cleanup_module);