net/sched/act_skbedit.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) 2008, Intel Corporation.
  *
  * Author: Alexander Duyck <alexander.h.duyck@intel.com>
  */

 #include <linux/module.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>
 #include <net/ip.h>
 #include <net/ipv6.h>
 #include <net/dsfield.h>
 #include <net/pkt_cls.h>

 #include <linux/tc_act/tc_skbedit.h>
 #include <net/tc_act/tc_skbedit.h>

 static unsigned int skbedit_net_id;
 static struct tc_action_ops act_skbedit_ops;

 static int tcf_skbedit_act(struct sk_buff *skb, const struct tc_action *a,
 			   struct tcf_result *res)
 {
 	struct tcf_skbedit *d = to_skbedit(a);
 	struct tcf_skbedit_params *params;
 	int action;

 	tcf_lastuse_update(&d->tcf_tm);
 	bstats_cpu_update(this_cpu_ptr(d->common.cpu_bstats), skb);

 	params = rcu_dereference_bh(d->params);
 	action = READ_ONCE(d->tcf_action);

 	if (params->flags & SKBEDIT_F_PRIORITY)
 		skb->priority = params->priority;
 	if (params->flags & SKBEDIT_F_INHERITDSFIELD) {
 		int wlen = skb_network_offset(skb);

 		switch (skb_protocol(skb, true)) {
 		case htons(ETH_P_IP):
 			wlen += sizeof(struct iphdr);
 			if (!pskb_may_pull(skb, wlen))
 				goto err;
 			skb->priority = ipv4_get_dsfield(ip_hdr(skb)) >> 2;
 			break;

 		case htons(ETH_P_IPV6):
 			wlen += sizeof(struct ipv6hdr);
 			if (!pskb_may_pull(skb, wlen))
 				goto err;
 			skb->priority = ipv6_get_dsfield(ipv6_hdr(skb)) >> 2;
 			break;
 		}
 	}
 	if (params->flags & SKBEDIT_F_QUEUE_MAPPING &&
 	    skb->dev->real_num_tx_queues > params->queue_mapping)
 		skb_set_queue_mapping(skb, params->queue_mapping);
 	if (params->flags & SKBEDIT_F_MARK) {
 		skb->mark &= ~params->mask;
 		skb->mark |= params->mark & params->mask;
 	}
 	if (params->flags & SKBEDIT_F_PTYPE)
 		skb->pkt_type = params->ptype;
 	return action;

 err:
 	qstats_drop_inc(this_cpu_ptr(d->common.cpu_qstats));
 	return TC_ACT_SHOT;
 }

 static void tcf_skbedit_stats_update(struct tc_action *a, u64 bytes,
 				     u64 packets, u64 drops,
 				     u64 lastuse, bool hw)
 {
 	struct tcf_skbedit *d = to_skbedit(a);
 	struct tcf_t *tm = &d->tcf_tm;

 	tcf_action_update_stats(a, bytes, packets, drops, hw);
 	tm->lastuse = max_t(u64, tm->lastuse, lastuse);
 }

 static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = {
 	[TCA_SKBEDIT_PARMS]		= { .len = sizeof(struct tc_skbedit) },
 	[TCA_SKBEDIT_PRIORITY]		= { .len = sizeof(u32) },
 	[TCA_SKBEDIT_QUEUE_MAPPING]	= { .len = sizeof(u16) },
 	[TCA_SKBEDIT_MARK]		= { .len = sizeof(u32) },
 	[TCA_SKBEDIT_PTYPE]		= { .len = sizeof(u16) },
 	[TCA_SKBEDIT_MASK]		= { .len = sizeof(u32) },
 	[TCA_SKBEDIT_FLAGS]		= { .len = sizeof(u64) },
 };

 static int tcf_skbedit_init(struct net *net, struct nlattr *nla,
 			    struct nlattr *est, struct tc_action **a,
 			    int ovr, int bind, bool rtnl_held,
 			    struct tcf_proto *tp, u32 act_flags,
 			    struct netlink_ext_ack *extack)
 {
 	struct tc_action_net *tn = net_generic(net, skbedit_net_id);
 	struct tcf_skbedit_params *params_new;
 	struct nlattr *tb[TCA_SKBEDIT_MAX + 1];
 	struct tcf_chain *goto_ch = NULL;
 	struct tc_skbedit *parm;
 	struct tcf_skbedit *d;
 	u32 flags = 0, *priority = NULL, *mark = NULL, *mask = NULL;
 	u16 *queue_mapping = NULL, *ptype = NULL;
 	bool exists = false;
 	int ret = 0, err;
 	u32 index;

 	if (nla == NULL)
 		return -EINVAL;

 	err = nla_parse_nested_deprecated(tb, TCA_SKBEDIT_MAX, nla,
 					  skbedit_policy, NULL);
 	if (err < 0)
 		return err;

 	if (tb[TCA_SKBEDIT_PARMS] == NULL)
 		return -EINVAL;

 	if (tb[TCA_SKBEDIT_PRIORITY] != NULL) {
 		flags |= SKBEDIT_F_PRIORITY;
 		priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]);
 	}

 	if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) {
 		flags |= SKBEDIT_F_QUEUE_MAPPING;
 		queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]);
 	}

 	if (tb[TCA_SKBEDIT_PTYPE] != NULL) {
 		ptype = nla_data(tb[TCA_SKBEDIT_PTYPE]);
 		if (!skb_pkt_type_ok(*ptype))
 			return -EINVAL;
 		flags |= SKBEDIT_F_PTYPE;
 	}

 	if (tb[TCA_SKBEDIT_MARK] != NULL) {
 		flags |= SKBEDIT_F_MARK;
 		mark = nla_data(tb[TCA_SKBEDIT_MARK]);
 	}

 	if (tb[TCA_SKBEDIT_MASK] != NULL) {
 		flags |= SKBEDIT_F_MASK;
 		mask = nla_data(tb[TCA_SKBEDIT_MASK]);
 	}

 	if (tb[TCA_SKBEDIT_FLAGS] != NULL) {
 		u64 *pure_flags = nla_data(tb[TCA_SKBEDIT_FLAGS]);

 		if (*pure_flags & SKBEDIT_F_INHERITDSFIELD)
 			flags |= SKBEDIT_F_INHERITDSFIELD;
 	}

 	parm = nla_data(tb[TCA_SKBEDIT_PARMS]);
 	index = parm->index;
 	err = tcf_idr_check_alloc(tn, &index, a, bind);
 	if (err < 0)
 		return err;
 	exists = err;
 	if (exists && bind)
 		return 0;

 	if (!flags) {
 		if (exists)
 			tcf_idr_release(*a, bind);
 		else
 			tcf_idr_cleanup(tn, index);
 		return -EINVAL;
 	}

 	if (!exists) {
 		ret = tcf_idr_create(tn, index, est, a,
 				     &act_skbedit_ops, bind, true, 0);
 		if (ret) {
 			tcf_idr_cleanup(tn, index);
 			return ret;
 		}

 		d = to_skbedit(*a);
 		ret = ACT_P_CREATED;
 	} else {
 		d = to_skbedit(*a);
 		if (!ovr) {
 			tcf_idr_release(*a, bind);
 			return -EEXIST;
 		}
 	}
 	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
 	if (err < 0)
 		goto release_idr;

 	params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
 	if (unlikely(!params_new)) {
 		err = -ENOMEM;
 		goto put_chain;
 	}

 	params_new->flags = flags;
 	if (flags & SKBEDIT_F_PRIORITY)
 		params_new->priority = *priority;
 	if (flags & SKBEDIT_F_QUEUE_MAPPING)
 		params_new->queue_mapping = *queue_mapping;
 	if (flags & SKBEDIT_F_MARK)
 		params_new->mark = *mark;
 	if (flags & SKBEDIT_F_PTYPE)
 		params_new->ptype = *ptype;
 	/* default behaviour is to use all the bits */
 	params_new->mask = 0xffffffff;
 	if (flags & SKBEDIT_F_MASK)
 		params_new->mask = *mask;

 	spin_lock_bh(&d->tcf_lock);
 	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
 	params_new = rcu_replace_pointer(d->params, params_new,
 					 lockdep_is_held(&d->tcf_lock));
 	spin_unlock_bh(&d->tcf_lock);
 	if (params_new)
 		kfree_rcu(params_new, rcu);
 	if (goto_ch)
 		tcf_chain_put_by_act(goto_ch);

 	if (ret == ACT_P_CREATED)
 		tcf_idr_insert(tn, *a);
 	return ret;
 put_chain:
 	if (goto_ch)
 		tcf_chain_put_by_act(goto_ch);
 release_idr:
 	tcf_idr_release(*a, bind);
 	return err;
 }

 static int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a,
 			    int bind, int ref)
 {
 	unsigned char *b = skb_tail_pointer(skb);
 	struct tcf_skbedit *d = to_skbedit(a);
 	struct tcf_skbedit_params *params;
 	struct tc_skbedit opt = {
 		.index   = d->tcf_index,
 		.refcnt  = refcount_read(&d->tcf_refcnt) - ref,
 		.bindcnt = atomic_read(&d->tcf_bindcnt) - bind,
 	};
 	u64 pure_flags = 0;
 	struct tcf_t t;

 	spin_lock_bh(&d->tcf_lock);
 	params = rcu_dereference_protected(d->params,
 					   lockdep_is_held(&d->tcf_lock));
 	opt.action = d->tcf_action;

 	if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt))
 		goto nla_put_failure;
 	if ((params->flags & SKBEDIT_F_PRIORITY) &&
 	    nla_put_u32(skb, TCA_SKBEDIT_PRIORITY, params->priority))
 		goto nla_put_failure;
 	if ((params->flags & SKBEDIT_F_QUEUE_MAPPING) &&
 	    nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING, params->queue_mapping))
 		goto nla_put_failure;
 	if ((params->flags & SKBEDIT_F_MARK) &&
 	    nla_put_u32(skb, TCA_SKBEDIT_MARK, params->mark))
 		goto nla_put_failure;
 	if ((params->flags & SKBEDIT_F_PTYPE) &&
 	    nla_put_u16(skb, TCA_SKBEDIT_PTYPE, params->ptype))
 		goto nla_put_failure;
 	if ((params->flags & SKBEDIT_F_MASK) &&
 	    nla_put_u32(skb, TCA_SKBEDIT_MASK, params->mask))
 		goto nla_put_failure;
 	if (params->flags & SKBEDIT_F_INHERITDSFIELD)
 		pure_flags |= SKBEDIT_F_INHERITDSFIELD;
 	if (pure_flags != 0 &&
 	    nla_put(skb, TCA_SKBEDIT_FLAGS, sizeof(pure_flags), &pure_flags))
 		goto nla_put_failure;

 	tcf_tm_dump(&t, &d->tcf_tm);
 	if (nla_put_64bit(skb, TCA_SKBEDIT_TM, sizeof(t), &t, TCA_SKBEDIT_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 void tcf_skbedit_cleanup(struct tc_action *a)
 {
 	struct tcf_skbedit *d = to_skbedit(a);
 	struct tcf_skbedit_params *params;

 	params = rcu_dereference_protected(d->params, 1);
 	if (params)
 		kfree_rcu(params, rcu);
 }

 static int tcf_skbedit_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, skbedit_net_id);

 	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
 }

 static int tcf_skbedit_search(struct net *net, struct tc_action **a, u32 index)
 {
 	struct tc_action_net *tn = net_generic(net, skbedit_net_id);

 	return tcf_idr_search(tn, a, index);
 }

 static size_t tcf_skbedit_get_fill_size(const struct tc_action *act)
 {
 	return nla_total_size(sizeof(struct tc_skbedit))
 		+ nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_PRIORITY */
 		+ nla_total_size(sizeof(u16)) /* TCA_SKBEDIT_QUEUE_MAPPING */
 		+ nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_MARK */
 		+ nla_total_size(sizeof(u16)) /* TCA_SKBEDIT_PTYPE */
 		+ nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_MASK */
 		+ nla_total_size_64bit(sizeof(u64)); /* TCA_SKBEDIT_FLAGS */
 }

 static struct tc_action_ops act_skbedit_ops = {
 	.kind		=	"skbedit",
 	.id		=	TCA_ID_SKBEDIT,
 	.owner		=	THIS_MODULE,
 	.act		=	tcf_skbedit_act,
 	.stats_update	=	tcf_skbedit_stats_update,
 	.dump		=	tcf_skbedit_dump,
 	.init		=	tcf_skbedit_init,
 	.cleanup	=	tcf_skbedit_cleanup,
 	.walk		=	tcf_skbedit_walker,
 	.get_fill_size	=	tcf_skbedit_get_fill_size,
 	.lookup		=	tcf_skbedit_search,
 	.size		=	sizeof(struct tcf_skbedit),
 };

 static __net_init int skbedit_init_net(struct net *net)
 {
 	struct tc_action_net *tn = net_generic(net, skbedit_net_id);

 	return tc_action_net_init(net, tn, &act_skbedit_ops);
 }

 static void __net_exit skbedit_exit_net(struct list_head *net_list)
 {
 	tc_action_net_exit(net_list, skbedit_net_id);
 }

 static struct pernet_operations skbedit_net_ops = {
 	.init = skbedit_init_net,
 	.exit_batch = skbedit_exit_net,
 	.id   = &skbedit_net_id,
 	.size = sizeof(struct tc_action_net),
 };

 MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>");
 MODULE_DESCRIPTION("SKB Editing");
 MODULE_LICENSE("GPL");

 static int __init skbedit_init_module(void)
 {
 	return tcf_register_action(&act_skbedit_ops, &skbedit_net_ops);
 }

 static void __exit skbedit_cleanup_module(void)
 {
 	tcf_unregister_action(&act_skbedit_ops, &skbedit_net_ops);
 }

 module_init(skbedit_init_module);
 module_exit(skbedit_cleanup_module);
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Copyright (c) 2008, Intel Corporation.
	*
	* Author: Alexander Duyck <alexander.h.duyck@intel.com>
	*/

	#include <linux/module.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>
	#include <net/ip.h>
	#include <net/ipv6.h>
	#include <net/dsfield.h>
	#include <net/pkt_cls.h>

	#include <linux/tc_act/tc_skbedit.h>
	#include <net/tc_act/tc_skbedit.h>

	static unsigned int skbedit_net_id;
	static struct tc_action_ops act_skbedit_ops;

	static int tcf_skbedit_act(struct sk_buff skb, const struct tc_action a,
	struct tcf_result *res)
	{
	struct tcf_skbedit *d = to_skbedit(a);
	struct tcf_skbedit_params *params;
	int action;

	tcf_lastuse_update(&d->tcf_tm);
	bstats_cpu_update(this_cpu_ptr(d->common.cpu_bstats), skb);

	params = rcu_dereference_bh(d->params);
	action = READ_ONCE(d->tcf_action);

	if (params->flags & SKBEDIT_F_PRIORITY)
	skb->priority = params->priority;
	if (params->flags & SKBEDIT_F_INHERITDSFIELD) {
	int wlen = skb_network_offset(skb);

	switch (skb_protocol(skb, true)) {
	case htons(ETH_P_IP):
	wlen += sizeof(struct iphdr);
	if (!pskb_may_pull(skb, wlen))
	goto err;
	skb->priority = ipv4_get_dsfield(ip_hdr(skb)) >> 2;
	break;

	case htons(ETH_P_IPV6):
	wlen += sizeof(struct ipv6hdr);
	if (!pskb_may_pull(skb, wlen))
	goto err;
	skb->priority = ipv6_get_dsfield(ipv6_hdr(skb)) >> 2;
	break;
	}
	}
	if (params->flags & SKBEDIT_F_QUEUE_MAPPING &&
	skb->dev->real_num_tx_queues > params->queue_mapping)
	skb_set_queue_mapping(skb, params->queue_mapping);
	if (params->flags & SKBEDIT_F_MARK) {
	skb->mark &= ~params->mask;
	skb->mark \|= params->mark & params->mask;
	}
	if (params->flags & SKBEDIT_F_PTYPE)
	skb->pkt_type = params->ptype;
	return action;

	err:
	qstats_drop_inc(this_cpu_ptr(d->common.cpu_qstats));
	return TC_ACT_SHOT;
	}

	static void tcf_skbedit_stats_update(struct tc_action *a, u64 bytes,
	u64 packets, u64 drops,
	u64 lastuse, bool hw)
	{
	struct tcf_skbedit *d = to_skbedit(a);
	struct tcf_t *tm = &d->tcf_tm;

	tcf_action_update_stats(a, bytes, packets, drops, hw);
	tm->lastuse = max_t(u64, tm->lastuse, lastuse);
	}

	static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = {
	[TCA_SKBEDIT_PARMS] = { .len = sizeof(struct tc_skbedit) },
	[TCA_SKBEDIT_PRIORITY] = { .len = sizeof(u32) },
	[TCA_SKBEDIT_QUEUE_MAPPING] = { .len = sizeof(u16) },
	[TCA_SKBEDIT_MARK] = { .len = sizeof(u32) },
	[TCA_SKBEDIT_PTYPE] = { .len = sizeof(u16) },
	[TCA_SKBEDIT_MASK] = { .len = sizeof(u32) },
	[TCA_SKBEDIT_FLAGS] = { .len = sizeof(u64) },
	};

	static int tcf_skbedit_init(struct net net, struct nlattr nla,
	struct nlattr est, struct tc_action *a,
	int ovr, int bind, bool rtnl_held,
	struct tcf_proto *tp, u32 act_flags,
	struct netlink_ext_ack *extack)
	{
	struct tc_action_net *tn = net_generic(net, skbedit_net_id);
	struct tcf_skbedit_params *params_new;
	struct nlattr *tb[TCA_SKBEDIT_MAX + 1];
	struct tcf_chain *goto_ch = NULL;
	struct tc_skbedit *parm;
	struct tcf_skbedit *d;
	u32 flags = 0, priority = NULL, mark = NULL, *mask = NULL;
	u16 queue_mapping = NULL, ptype = NULL;
	bool exists = false;
	int ret = 0, err;
	u32 index;

	if (nla == NULL)
	return -EINVAL;

	err = nla_parse_nested_deprecated(tb, TCA_SKBEDIT_MAX, nla,
	skbedit_policy, NULL);
	if (err < 0)
	return err;

	if (tb[TCA_SKBEDIT_PARMS] == NULL)
	return -EINVAL;

	if (tb[TCA_SKBEDIT_PRIORITY] != NULL) {
	flags \|= SKBEDIT_F_PRIORITY;
	priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]);
	}

	if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) {
	flags \|= SKBEDIT_F_QUEUE_MAPPING;
	queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]);
	}

	if (tb[TCA_SKBEDIT_PTYPE] != NULL) {
	ptype = nla_data(tb[TCA_SKBEDIT_PTYPE]);
	if (!skb_pkt_type_ok(*ptype))
	return -EINVAL;
	flags \|= SKBEDIT_F_PTYPE;
	}

	if (tb[TCA_SKBEDIT_MARK] != NULL) {
	flags \|= SKBEDIT_F_MARK;
	mark = nla_data(tb[TCA_SKBEDIT_MARK]);
	}

	if (tb[TCA_SKBEDIT_MASK] != NULL) {
	flags \|= SKBEDIT_F_MASK;
	mask = nla_data(tb[TCA_SKBEDIT_MASK]);
	}

	if (tb[TCA_SKBEDIT_FLAGS] != NULL) {
	u64 *pure_flags = nla_data(tb[TCA_SKBEDIT_FLAGS]);

	if (*pure_flags & SKBEDIT_F_INHERITDSFIELD)
	flags \|= SKBEDIT_F_INHERITDSFIELD;
	}

	parm = nla_data(tb[TCA_SKBEDIT_PARMS]);
	index = parm->index;
	err = tcf_idr_check_alloc(tn, &index, a, bind);
	if (err < 0)
	return err;
	exists = err;
	if (exists && bind)
	return 0;

	if (!flags) {
	if (exists)
	tcf_idr_release(*a, bind);
	else
	tcf_idr_cleanup(tn, index);
	return -EINVAL;
	}

	if (!exists) {
	ret = tcf_idr_create(tn, index, est, a,
	&act_skbedit_ops, bind, true, 0);
	if (ret) {
	tcf_idr_cleanup(tn, index);
	return ret;
	}

	d = to_skbedit(*a);
	ret = ACT_P_CREATED;
	} else {
	d = to_skbedit(*a);
	if (!ovr) {
	tcf_idr_release(*a, bind);
	return -EEXIST;
	}
	}
	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
	if (err < 0)
	goto release_idr;

	params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
	if (unlikely(!params_new)) {
	err = -ENOMEM;
	goto put_chain;
	}

	params_new->flags = flags;
	if (flags & SKBEDIT_F_PRIORITY)
	params_new->priority = *priority;
	if (flags & SKBEDIT_F_QUEUE_MAPPING)
	params_new->queue_mapping = *queue_mapping;
	if (flags & SKBEDIT_F_MARK)
	params_new->mark = *mark;
	if (flags & SKBEDIT_F_PTYPE)
	params_new->ptype = *ptype;
	/* default behaviour is to use all the bits */
	params_new->mask = 0xffffffff;
	if (flags & SKBEDIT_F_MASK)
	params_new->mask = *mask;

	spin_lock_bh(&d->tcf_lock);
	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
	params_new = rcu_replace_pointer(d->params, params_new,
	lockdep_is_held(&d->tcf_lock));
	spin_unlock_bh(&d->tcf_lock);
	if (params_new)
	kfree_rcu(params_new, rcu);
	if (goto_ch)
	tcf_chain_put_by_act(goto_ch);

	if (ret == ACT_P_CREATED)
	tcf_idr_insert(tn, *a);
	return ret;
	put_chain:
	if (goto_ch)
	tcf_chain_put_by_act(goto_ch);
	release_idr:
	tcf_idr_release(*a, bind);
	return err;
	}

	static int tcf_skbedit_dump(struct sk_buff skb, struct tc_action a,
	int bind, int ref)
	{
	unsigned char *b = skb_tail_pointer(skb);
	struct tcf_skbedit *d = to_skbedit(a);
	struct tcf_skbedit_params *params;
	struct tc_skbedit opt = {
	.index = d->tcf_index,
	.refcnt = refcount_read(&d->tcf_refcnt) - ref,
	.bindcnt = atomic_read(&d->tcf_bindcnt) - bind,
	};
	u64 pure_flags = 0;
	struct tcf_t t;

	spin_lock_bh(&d->tcf_lock);
	params = rcu_dereference_protected(d->params,
	lockdep_is_held(&d->tcf_lock));
	opt.action = d->tcf_action;

	if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt))
	goto nla_put_failure;
	if ((params->flags & SKBEDIT_F_PRIORITY) &&
	nla_put_u32(skb, TCA_SKBEDIT_PRIORITY, params->priority))
	goto nla_put_failure;
	if ((params->flags & SKBEDIT_F_QUEUE_MAPPING) &&
	nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING, params->queue_mapping))
	goto nla_put_failure;
	if ((params->flags & SKBEDIT_F_MARK) &&
	nla_put_u32(skb, TCA_SKBEDIT_MARK, params->mark))
	goto nla_put_failure;
	if ((params->flags & SKBEDIT_F_PTYPE) &&
	nla_put_u16(skb, TCA_SKBEDIT_PTYPE, params->ptype))
	goto nla_put_failure;
	if ((params->flags & SKBEDIT_F_MASK) &&
	nla_put_u32(skb, TCA_SKBEDIT_MASK, params->mask))
	goto nla_put_failure;
	if (params->flags & SKBEDIT_F_INHERITDSFIELD)
	pure_flags \|= SKBEDIT_F_INHERITDSFIELD;
	if (pure_flags != 0 &&
	nla_put(skb, TCA_SKBEDIT_FLAGS, sizeof(pure_flags), &pure_flags))
	goto nla_put_failure;

	tcf_tm_dump(&t, &d->tcf_tm);
	if (nla_put_64bit(skb, TCA_SKBEDIT_TM, sizeof(t), &t, TCA_SKBEDIT_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 void tcf_skbedit_cleanup(struct tc_action *a)
	{
	struct tcf_skbedit *d = to_skbedit(a);
	struct tcf_skbedit_params *params;

	params = rcu_dereference_protected(d->params, 1);
	if (params)
	kfree_rcu(params, rcu);
	}

	static int tcf_skbedit_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, skbedit_net_id);

	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
	}

	static int tcf_skbedit_search(struct net net, struct tc_action *a, u32 index)
	{
	struct tc_action_net *tn = net_generic(net, skbedit_net_id);

	return tcf_idr_search(tn, a, index);
	}

	static size_t tcf_skbedit_get_fill_size(const struct tc_action *act)
	{
	return nla_total_size(sizeof(struct tc_skbedit))
	+ nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_PRIORITY */
	+ nla_total_size(sizeof(u16)) /* TCA_SKBEDIT_QUEUE_MAPPING */
	+ nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_MARK */
	+ nla_total_size(sizeof(u16)) /* TCA_SKBEDIT_PTYPE */
	+ nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_MASK */
	+ nla_total_size_64bit(sizeof(u64)); /* TCA_SKBEDIT_FLAGS */
	}

	static struct tc_action_ops act_skbedit_ops = {
	.kind = "skbedit",
	.id = TCA_ID_SKBEDIT,
	.owner = THIS_MODULE,
	.act = tcf_skbedit_act,
	.stats_update = tcf_skbedit_stats_update,
	.dump = tcf_skbedit_dump,
	.init = tcf_skbedit_init,
	.cleanup = tcf_skbedit_cleanup,
	.walk = tcf_skbedit_walker,
	.get_fill_size = tcf_skbedit_get_fill_size,
	.lookup = tcf_skbedit_search,
	.size = sizeof(struct tcf_skbedit),
	};

	static __net_init int skbedit_init_net(struct net *net)
	{
	struct tc_action_net *tn = net_generic(net, skbedit_net_id);

	return tc_action_net_init(net, tn, &act_skbedit_ops);
	}

	static void __net_exit skbedit_exit_net(struct list_head *net_list)
	{
	tc_action_net_exit(net_list, skbedit_net_id);
	}

	static struct pernet_operations skbedit_net_ops = {
	.init = skbedit_init_net,
	.exit_batch = skbedit_exit_net,
	.id = &skbedit_net_id,
	.size = sizeof(struct tc_action_net),
	};

	MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>");
	MODULE_DESCRIPTION("SKB Editing");
	MODULE_LICENSE("GPL");

	static int __init skbedit_init_module(void)
	{
	return tcf_register_action(&act_skbedit_ops, &skbedit_net_ops);
	}

	static void __exit skbedit_cleanup_module(void)
	{
	tcf_unregister_action(&act_skbedit_ops, &skbedit_net_ops);
	}

	module_init(skbedit_init_module);
	module_exit(skbedit_cleanup_module);