1 files changed, 357 insertions, 0 deletions
diff --git a/net/sched/cls_matchall.c b/net/sched/cls_matchall.c
new file mode 100644
index 000000000..74863b0ff
--- /dev/null
+++ b/net/sched/cls_matchall.c
@@ -0,0 +1,357 @@
+/*
+ * net/sched/cls_matchll.c		Match-all classifier
+ *
+ * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com>
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+
+#include <net/sch_generic.h>
+#include <net/pkt_cls.h>
+
+struct cls_mall_head {
+	struct tcf_exts exts;
+	struct tcf_result res;
+	u32 handle;
+	u32 flags;
+	unsigned int in_hw_count;
+	struct rcu_work rwork;
+};
+
+static int mall_classify(struct sk_buff *skb, const struct tcf_proto *tp,
+			 struct tcf_result *res)
+{
+	struct cls_mall_head *head = rcu_dereference_bh(tp->root);
+
+	if (tc_skip_sw(head->flags))
+		return -1;
+
+	*res = head->res;
+	return tcf_exts_exec(skb, &head->exts, res);
+}
+
+static int mall_init(struct tcf_proto *tp)
+{
+	return 0;
+}
+
+static void __mall_destroy(struct cls_mall_head *head)
+{
+	tcf_exts_destroy(&head->exts);
+	tcf_exts_put_net(&head->exts);
+	kfree(head);
+}
+
+static void mall_destroy_work(struct work_struct *work)
+{
+	struct cls_mall_head *head = container_of(to_rcu_work(work),
+						  struct cls_mall_head,
+						  rwork);
+	rtnl_lock();
+	__mall_destroy(head);
+	rtnl_unlock();
+}
+
+static void mall_destroy_hw_filter(struct tcf_proto *tp,
+				   struct cls_mall_head *head,
+				   unsigned long cookie,
+				   struct netlink_ext_ack *extack)
+{
+	struct tc_cls_matchall_offload cls_mall = {};
+	struct tcf_block *block = tp->chain->block;
+
+	tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack);
+	cls_mall.command = TC_CLSMATCHALL_DESTROY;
+	cls_mall.cookie = cookie;
+
+	tc_setup_cb_call(block, NULL, TC_SETUP_CLSMATCHALL, &cls_mall, false);
+	tcf_block_offload_dec(block, &head->flags);
+}
+
+static int mall_replace_hw_filter(struct tcf_proto *tp,
+				  struct cls_mall_head *head,
+				  unsigned long cookie,
+				  struct netlink_ext_ack *extack)
+{
+	struct tc_cls_matchall_offload cls_mall = {};
+	struct tcf_block *block = tp->chain->block;
+	bool skip_sw = tc_skip_sw(head->flags);
+	int err;
+
+	tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack);
+	cls_mall.command = TC_CLSMATCHALL_REPLACE;
+	cls_mall.exts = &head->exts;
+	cls_mall.cookie = cookie;
+
+	err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSMATCHALL,
+			       &cls_mall, skip_sw);
+	if (err < 0) {
+		mall_destroy_hw_filter(tp, head, cookie, NULL);
+		return err;
+	} else if (err > 0) {
+		head->in_hw_count = err;
+		tcf_block_offload_inc(block, &head->flags);
+	}
+
+	if (skip_sw && !(head->flags & TCA_CLS_FLAGS_IN_HW))
+		return -EINVAL;
+
+	return 0;
+}
+
+static void mall_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
+{
+	struct cls_mall_head *head = rtnl_dereference(tp->root);
+
+	if (!head)
+		return;
+
+	tcf_unbind_filter(tp, &head->res);
+
+	if (!tc_skip_hw(head->flags))
+		mall_destroy_hw_filter(tp, head, (unsigned long) head, extack);
+
+	if (tcf_exts_get_net(&head->exts))
+		tcf_queue_work(&head->rwork, mall_destroy_work);
+	else
+		__mall_destroy(head);
+}
+
+static void *mall_get(struct tcf_proto *tp, u32 handle)
+{
+	struct cls_mall_head *head = rtnl_dereference(tp->root);
+
+	if (head && head->handle == handle)
+		return head;
+
+	return NULL;
+}
+
+static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = {
+	[TCA_MATCHALL_UNSPEC]		= { .type = NLA_UNSPEC },
+	[TCA_MATCHALL_CLASSID]		= { .type = NLA_U32 },
+	[TCA_MATCHALL_FLAGS]		= { .type = NLA_U32 },
+};
+
+static int mall_set_parms(struct net *net, struct tcf_proto *tp,
+			  struct cls_mall_head *head,
+			  unsigned long base, struct nlattr **tb,
+			  struct nlattr *est, bool ovr,
+			  struct netlink_ext_ack *extack)
+{
+	int err;
+
+	err = tcf_exts_validate(net, tp, tb, est, &head->exts, ovr, extack);
+	if (err < 0)
+		return err;
+
+	if (tb[TCA_MATCHALL_CLASSID]) {
+		head->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]);
+		tcf_bind_filter(tp, &head->res, base);
+	}
+	return 0;
+}
+
+static int mall_change(struct net *net, struct sk_buff *in_skb,
+		       struct tcf_proto *tp, unsigned long base,
+		       u32 handle, struct nlattr **tca,
+		       void **arg, bool ovr, struct netlink_ext_ack *extack)
+{
+	struct cls_mall_head *head = rtnl_dereference(tp->root);
+	struct nlattr *tb[TCA_MATCHALL_MAX + 1];
+	struct cls_mall_head *new;
+	u32 flags = 0;
+	int err;
+
+	if (!tca[TCA_OPTIONS])
+		return -EINVAL;
+
+	if (head)
+		return -EEXIST;
+
+	err = nla_parse_nested(tb, TCA_MATCHALL_MAX, tca[TCA_OPTIONS],
+			       mall_policy, NULL);
+	if (err < 0)
+		return err;
+
+	if (tb[TCA_MATCHALL_FLAGS]) {
+		flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]);
+		if (!tc_flags_valid(flags))
+			return -EINVAL;
+	}
+
+	new = kzalloc(sizeof(*new), GFP_KERNEL);
+	if (!new)
+		return -ENOBUFS;
+
+	err = tcf_exts_init(&new->exts, TCA_MATCHALL_ACT, 0);
+	if (err)
+		goto err_exts_init;
+
+	if (!handle)
+		handle = 1;
+	new->handle = handle;
+	new->flags = flags;
+
+	err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], ovr,
+			     extack);
+	if (err)
+		goto err_set_parms;
+
+	if (!tc_skip_hw(new->flags)) {
+		err = mall_replace_hw_filter(tp, new, (unsigned long)new,
+					     extack);
+		if (err)
+			goto err_replace_hw_filter;
+	}
+
+	if (!tc_in_hw(new->flags))
+		new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
+
+	*arg = head;
+	rcu_assign_pointer(tp->root, new);
+	return 0;
+
+err_replace_hw_filter:
+err_set_parms:
+	tcf_exts_destroy(&new->exts);
+err_exts_init:
+	kfree(new);
+	return err;
+}
+
+static int mall_delete(struct tcf_proto *tp, void *arg, bool *last,
+		       struct netlink_ext_ack *extack)
+{
+	return -EOPNOTSUPP;
+}
+
+static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg)
+{
+	struct cls_mall_head *head = rtnl_dereference(tp->root);
+
+	if (arg->count < arg->skip)
+		goto skip;
+	if (arg->fn(tp, head, arg) < 0)
+		arg->stop = 1;
+skip:
+	arg->count++;
+}
+
+static int mall_reoffload(struct tcf_proto *tp, bool add, tc_setup_cb_t *cb,
+			  void *cb_priv, struct netlink_ext_ack *extack)
+{
+	struct cls_mall_head *head = rtnl_dereference(tp->root);
+	struct tc_cls_matchall_offload cls_mall = {};
+	struct tcf_block *block = tp->chain->block;
+	int err;
+
+	if (tc_skip_hw(head->flags))
+		return 0;
+
+	tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack);
+	cls_mall.command = add ?
+		TC_CLSMATCHALL_REPLACE : TC_CLSMATCHALL_DESTROY;
+	cls_mall.exts = &head->exts;
+	cls_mall.cookie = (unsigned long)head;
+
+	err = cb(TC_SETUP_CLSMATCHALL, &cls_mall, cb_priv);
+	if (err) {
+		if (add && tc_skip_sw(head->flags))
+			return err;
+		return 0;
+	}
+
+	tc_cls_offload_cnt_update(block, &head->in_hw_count, &head->flags, add);
+
+	return 0;
+}
+
+static int mall_dump(struct net *net, struct tcf_proto *tp, void *fh,
+		     struct sk_buff *skb, struct tcmsg *t)
+{
+	struct cls_mall_head *head = fh;
+	struct nlattr *nest;
+
+	if (!head)
+		return skb->len;
+
+	t->tcm_handle = head->handle;
+
+	nest = nla_nest_start(skb, TCA_OPTIONS);
+	if (!nest)
+		goto nla_put_failure;
+
+	if (head->res.classid &&
+	    nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid))
+		goto nla_put_failure;
+
+	if (head->flags && nla_put_u32(skb, TCA_MATCHALL_FLAGS, head->flags))
+		goto nla_put_failure;
+
+	if (tcf_exts_dump(skb, &head->exts))
+		goto nla_put_failure;
+
+	nla_nest_end(skb, nest);
+
+	if (tcf_exts_dump_stats(skb, &head->exts) < 0)
+		goto nla_put_failure;
+
+	return skb->len;
+
+nla_put_failure:
+	nla_nest_cancel(skb, nest);
+	return -1;
+}
+
+static void mall_bind_class(void *fh, u32 classid, unsigned long cl, void *q,
+			    unsigned long base)
+{
+	struct cls_mall_head *head = fh;
+
+	if (head && head->res.classid == classid) {
+		if (cl)
+			__tcf_bind_filter(q, &head->res, base);
+		else
+			__tcf_unbind_filter(q, &head->res);
+	}
+}
+
+static struct tcf_proto_ops cls_mall_ops __read_mostly = {
+	.kind		= "matchall",
+	.classify	= mall_classify,
+	.init		= mall_init,
+	.destroy	= mall_destroy,
+	.get		= mall_get,
+	.change		= mall_change,
+	.delete		= mall_delete,
+	.walk		= mall_walk,
+	.reoffload	= mall_reoffload,
+	.dump		= mall_dump,
+	.bind_class	= mall_bind_class,
+	.owner		= THIS_MODULE,
+};
+
+static int __init cls_mall_init(void)
+{
+	return register_tcf_proto_ops(&cls_mall_ops);
+}
+
+static void __exit cls_mall_exit(void)
+{
+	unregister_tcf_proto_ops(&cls_mall_ops);
+}
+
+module_init(cls_mall_init);
+module_exit(cls_mall_exit);
+
+MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>");
+MODULE_DESCRIPTION("Match-all classifier");
+MODULE_LICENSE("GPL v2");