net/sched/cls_matchall.c - kernel/msm-5.4 - Gitiles

 /*
  * 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_filter {
 	struct tcf_exts exts;
 	struct tcf_result res;
 	u32 handle;
 	struct rcu_head	rcu;
 	u32 flags;
 };

 struct cls_mall_head {
 	struct cls_mall_filter *filter;
 	struct rcu_head	rcu;
 };

 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);
 	struct cls_mall_filter *f = head->filter;

 	if (tc_skip_sw(f->flags))
 		return -1;

 	return tcf_exts_exec(skb, &f->exts, res);
 }

 static int mall_init(struct tcf_proto *tp)
 {
 	struct cls_mall_head *head;

 	head = kzalloc(sizeof(*head), GFP_KERNEL);
 	if (!head)
 		return -ENOBUFS;

 	rcu_assign_pointer(tp->root, head);

 	return 0;
 }

 static void mall_destroy_filter(struct rcu_head *head)
 {
 	struct cls_mall_filter *f = container_of(head, struct cls_mall_filter, rcu);

 	tcf_exts_destroy(&f->exts);

 	kfree(f);
 }

 static int mall_replace_hw_filter(struct tcf_proto *tp,
 				  struct cls_mall_filter *f,
 				  unsigned long cookie)
 {
 	struct net_device *dev = tp->q->dev_queue->dev;
 	struct tc_to_netdev offload;
 	struct tc_cls_matchall_offload mall_offload = {0};

 	offload.type = TC_SETUP_MATCHALL;
 	offload.cls_mall = &mall_offload;
 	offload.cls_mall->command = TC_CLSMATCHALL_REPLACE;
 	offload.cls_mall->exts = &f->exts;
 	offload.cls_mall->cookie = cookie;

 	return dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol,
 					     &offload);
 }

 static void mall_destroy_hw_filter(struct tcf_proto *tp,
 				   struct cls_mall_filter *f,
 				   unsigned long cookie)
 {
 	struct net_device *dev = tp->q->dev_queue->dev;
 	struct tc_to_netdev offload;
 	struct tc_cls_matchall_offload mall_offload = {0};

 	offload.type = TC_SETUP_MATCHALL;
 	offload.cls_mall = &mall_offload;
 	offload.cls_mall->command = TC_CLSMATCHALL_DESTROY;
 	offload.cls_mall->exts = NULL;
 	offload.cls_mall->cookie = cookie;

 	dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol,
 					     &offload);
 }

 static bool mall_destroy(struct tcf_proto *tp, bool force)
 {
 	struct cls_mall_head *head = rtnl_dereference(tp->root);
 	struct net_device *dev = tp->q->dev_queue->dev;
 	struct cls_mall_filter *f = head->filter;

 	if (!force && f)
 		return false;

 	if (f) {
 		if (tc_should_offload(dev, tp, f->flags))
 			mall_destroy_hw_filter(tp, f, (unsigned long) f);

 		call_rcu(&f->rcu, mall_destroy_filter);
 	}
 	kfree_rcu(head, rcu);
 	return true;
 }

 static unsigned long mall_get(struct tcf_proto *tp, u32 handle)
 {
 	struct cls_mall_head *head = rtnl_dereference(tp->root);
 	struct cls_mall_filter *f = head->filter;

 	if (f && f->handle == handle)
 		return (unsigned long) f;
 	return 0;
 }

 static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = {
 	[TCA_MATCHALL_UNSPEC]		= { .type = NLA_UNSPEC },
 	[TCA_MATCHALL_CLASSID]		= { .type = NLA_U32 },
 };

 static int mall_set_parms(struct net *net, struct tcf_proto *tp,
 			  struct cls_mall_filter *f,
 			  unsigned long base, struct nlattr **tb,
 			  struct nlattr *est, bool ovr)
 {
 	struct tcf_exts e;
 	int err;

 	tcf_exts_init(&e, TCA_MATCHALL_ACT, 0);
 	err = tcf_exts_validate(net, tp, tb, est, &e, ovr);
 	if (err < 0)
 		return err;

 	if (tb[TCA_MATCHALL_CLASSID]) {
 		f->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]);
 		tcf_bind_filter(tp, &f->res, base);
 	}

 	tcf_exts_change(tp, &f->exts, &e);

 	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,
 		       unsigned long *arg, bool ovr)
 {
 	struct cls_mall_head *head = rtnl_dereference(tp->root);
 	struct cls_mall_filter *fold = (struct cls_mall_filter *) *arg;
 	struct net_device *dev = tp->q->dev_queue->dev;
 	struct cls_mall_filter *f;
 	struct nlattr *tb[TCA_MATCHALL_MAX + 1];
 	u32 flags = 0;
 	int err;

 	if (!tca[TCA_OPTIONS])
 		return -EINVAL;

 	if (head->filter)
 		return -EBUSY;

 	if (fold)
 		return -EINVAL;

 	err = nla_parse_nested(tb, TCA_MATCHALL_MAX,
 			       tca[TCA_OPTIONS], mall_policy);
 	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;
 	}

 	f = kzalloc(sizeof(*f), GFP_KERNEL);
 	if (!f)
 		return -ENOBUFS;

 	tcf_exts_init(&f->exts, TCA_MATCHALL_ACT, 0);

 	if (!handle)
 		handle = 1;
 	f->handle = handle;
 	f->flags = flags;

 	err = mall_set_parms(net, tp, f, base, tb, tca[TCA_RATE], ovr);
 	if (err)
 		goto errout;

 	if (tc_should_offload(dev, tp, flags)) {
 		err = mall_replace_hw_filter(tp, f, (unsigned long) f);
 		if (err) {
 			if (tc_skip_sw(flags))
 				goto errout;
 			else
 				err = 0;
 		}
 	}

 	*arg = (unsigned long) f;
 	rcu_assign_pointer(head->filter, f);

 	return 0;

 errout:
 	kfree(f);
 	return err;
 }

 static int mall_delete(struct tcf_proto *tp, unsigned long arg)
 {
 	struct cls_mall_head *head = rtnl_dereference(tp->root);
 	struct cls_mall_filter *f = (struct cls_mall_filter *) arg;
 	struct net_device *dev = tp->q->dev_queue->dev;

 	if (tc_should_offload(dev, tp, f->flags))
 		mall_destroy_hw_filter(tp, f, (unsigned long) f);

 	RCU_INIT_POINTER(head->filter, NULL);
 	tcf_unbind_filter(tp, &f->res);
 	call_rcu(&f->rcu, mall_destroy_filter);
 	return 0;
 }

 static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg)
 {
 	struct cls_mall_head *head = rtnl_dereference(tp->root);
 	struct cls_mall_filter *f = head->filter;

 	if (arg->count < arg->skip)
 		goto skip;
 	if (arg->fn(tp, (unsigned long) f, arg) < 0)
 		arg->stop = 1;
 skip:
 	arg->count++;
 }

 static int mall_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
 		     struct sk_buff *skb, struct tcmsg *t)
 {
 	struct cls_mall_filter *f = (struct cls_mall_filter *) fh;
 	struct nlattr *nest;

 	if (!f)
 		return skb->len;

 	t->tcm_handle = f->handle;

 	nest = nla_nest_start(skb, TCA_OPTIONS);
 	if (!nest)
 		goto nla_put_failure;

 	if (f->res.classid &&
 	    nla_put_u32(skb, TCA_MATCHALL_CLASSID, f->res.classid))
 		goto nla_put_failure;

 	if (tcf_exts_dump(skb, &f->exts))
 		goto nla_put_failure;

 	nla_nest_end(skb, nest);

 	if (tcf_exts_dump_stats(skb, &f->exts) < 0)
 		goto nla_put_failure;

 	return skb->len;

 nla_put_failure:
 	nla_nest_cancel(skb, nest);
 	return -1;
 }

 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,
 	.dump		= mall_dump,
 	.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");
	/*
	* 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_filter {
	struct tcf_exts exts;
	struct tcf_result res;
	u32 handle;
	struct rcu_head rcu;
	u32 flags;
	};

	struct cls_mall_head {
	struct cls_mall_filter *filter;
	struct rcu_head rcu;
	};

	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);
	struct cls_mall_filter *f = head->filter;

	if (tc_skip_sw(f->flags))
	return -1;

	return tcf_exts_exec(skb, &f->exts, res);
	}

	static int mall_init(struct tcf_proto *tp)
	{
	struct cls_mall_head *head;

	head = kzalloc(sizeof(*head), GFP_KERNEL);
	if (!head)
	return -ENOBUFS;

	rcu_assign_pointer(tp->root, head);

	return 0;
	}

	static void mall_destroy_filter(struct rcu_head *head)
	{
	struct cls_mall_filter *f = container_of(head, struct cls_mall_filter, rcu);

	tcf_exts_destroy(&f->exts);

	kfree(f);
	}

	static int mall_replace_hw_filter(struct tcf_proto *tp,
	struct cls_mall_filter *f,
	unsigned long cookie)
	{
	struct net_device *dev = tp->q->dev_queue->dev;
	struct tc_to_netdev offload;
	struct tc_cls_matchall_offload mall_offload = {0};

	offload.type = TC_SETUP_MATCHALL;
	offload.cls_mall = &mall_offload;
	offload.cls_mall->command = TC_CLSMATCHALL_REPLACE;
	offload.cls_mall->exts = &f->exts;
	offload.cls_mall->cookie = cookie;

	return dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol,
	&offload);
	}

	static void mall_destroy_hw_filter(struct tcf_proto *tp,
	struct cls_mall_filter *f,
	unsigned long cookie)
	{
	struct net_device *dev = tp->q->dev_queue->dev;
	struct tc_to_netdev offload;
	struct tc_cls_matchall_offload mall_offload = {0};

	offload.type = TC_SETUP_MATCHALL;
	offload.cls_mall = &mall_offload;
	offload.cls_mall->command = TC_CLSMATCHALL_DESTROY;
	offload.cls_mall->exts = NULL;
	offload.cls_mall->cookie = cookie;

	dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol,
	&offload);
	}

	static bool mall_destroy(struct tcf_proto *tp, bool force)
	{
	struct cls_mall_head *head = rtnl_dereference(tp->root);
	struct net_device *dev = tp->q->dev_queue->dev;
	struct cls_mall_filter *f = head->filter;

	if (!force && f)
	return false;

	if (f) {
	if (tc_should_offload(dev, tp, f->flags))
	mall_destroy_hw_filter(tp, f, (unsigned long) f);

	call_rcu(&f->rcu, mall_destroy_filter);
	}
	kfree_rcu(head, rcu);
	return true;
	}

	static unsigned long mall_get(struct tcf_proto *tp, u32 handle)
	{
	struct cls_mall_head *head = rtnl_dereference(tp->root);
	struct cls_mall_filter *f = head->filter;

	if (f && f->handle == handle)
	return (unsigned long) f;
	return 0;
	}

	static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = {
	[TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC },
	[TCA_MATCHALL_CLASSID] = { .type = NLA_U32 },
	};

	static int mall_set_parms(struct net net, struct tcf_proto tp,
	struct cls_mall_filter *f,
	unsigned long base, struct nlattr **tb,
	struct nlattr *est, bool ovr)
	{
	struct tcf_exts e;
	int err;

	tcf_exts_init(&e, TCA_MATCHALL_ACT, 0);
	err = tcf_exts_validate(net, tp, tb, est, &e, ovr);
	if (err < 0)
	return err;

	if (tb[TCA_MATCHALL_CLASSID]) {
	f->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]);
	tcf_bind_filter(tp, &f->res, base);
	}

	tcf_exts_change(tp, &f->exts, &e);

	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,
	unsigned long *arg, bool ovr)
	{
	struct cls_mall_head *head = rtnl_dereference(tp->root);
	struct cls_mall_filter fold = (struct cls_mall_filter ) *arg;
	struct net_device *dev = tp->q->dev_queue->dev;
	struct cls_mall_filter *f;
	struct nlattr *tb[TCA_MATCHALL_MAX + 1];
	u32 flags = 0;
	int err;

	if (!tca[TCA_OPTIONS])
	return -EINVAL;

	if (head->filter)
	return -EBUSY;

	if (fold)
	return -EINVAL;

	err = nla_parse_nested(tb, TCA_MATCHALL_MAX,
	tca[TCA_OPTIONS], mall_policy);
	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;
	}

	f = kzalloc(sizeof(*f), GFP_KERNEL);
	if (!f)
	return -ENOBUFS;

	tcf_exts_init(&f->exts, TCA_MATCHALL_ACT, 0);

	if (!handle)
	handle = 1;
	f->handle = handle;
	f->flags = flags;

	err = mall_set_parms(net, tp, f, base, tb, tca[TCA_RATE], ovr);
	if (err)
	goto errout;

	if (tc_should_offload(dev, tp, flags)) {
	err = mall_replace_hw_filter(tp, f, (unsigned long) f);
	if (err) {
	if (tc_skip_sw(flags))
	goto errout;
	else
	err = 0;
	}
	}

	*arg = (unsigned long) f;
	rcu_assign_pointer(head->filter, f);

	return 0;

	errout:
	kfree(f);
	return err;
	}

	static int mall_delete(struct tcf_proto *tp, unsigned long arg)
	{
	struct cls_mall_head *head = rtnl_dereference(tp->root);
	struct cls_mall_filter f = (struct cls_mall_filter ) arg;
	struct net_device *dev = tp->q->dev_queue->dev;

	if (tc_should_offload(dev, tp, f->flags))
	mall_destroy_hw_filter(tp, f, (unsigned long) f);

	RCU_INIT_POINTER(head->filter, NULL);
	tcf_unbind_filter(tp, &f->res);
	call_rcu(&f->rcu, mall_destroy_filter);
	return 0;
	}

	static void mall_walk(struct tcf_proto tp, struct tcf_walker arg)
	{
	struct cls_mall_head *head = rtnl_dereference(tp->root);
	struct cls_mall_filter *f = head->filter;

	if (arg->count < arg->skip)
	goto skip;
	if (arg->fn(tp, (unsigned long) f, arg) < 0)
	arg->stop = 1;
	skip:
	arg->count++;
	}

	static int mall_dump(struct net net, struct tcf_proto tp, unsigned long fh,
	struct sk_buff skb, struct tcmsg t)
	{
	struct cls_mall_filter f = (struct cls_mall_filter ) fh;
	struct nlattr *nest;

	if (!f)
	return skb->len;

	t->tcm_handle = f->handle;

	nest = nla_nest_start(skb, TCA_OPTIONS);
	if (!nest)
	goto nla_put_failure;

	if (f->res.classid &&
	nla_put_u32(skb, TCA_MATCHALL_CLASSID, f->res.classid))
	goto nla_put_failure;

	if (tcf_exts_dump(skb, &f->exts))
	goto nla_put_failure;

	nla_nest_end(skb, nest);

	if (tcf_exts_dump_stats(skb, &f->exts) < 0)
	goto nla_put_failure;

	return skb->len;

	nla_put_failure:
	nla_nest_cancel(skb, nest);
	return -1;
	}

	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,
	.dump = mall_dump,
	.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");