[linux-2.6-block.git] / net / sched / act_skbedit.c

// 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 (tc_skb_protocol(skb)) {
		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 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,
			    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);
		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);
	rcu_swap_protected(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,
	.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);
Commit	Line	Data
9952f691	1	// SPDX-License-Identifier: GPL-2.0-only
ca9b0e27 AD	2	/*
	3	* Copyright (c) 2008, Intel Corporation.
	4	*
ca9b0e27 AD	5	* Author: Alexander Duyck <alexander.h.duyck@intel.com>
	6	*/
	7
	8	#include <linux/module.h>
	9	#include <linux/init.h>
	10	#include <linux/kernel.h>
	11	#include <linux/skbuff.h>
	12	#include <linux/rtnetlink.h>
	13	#include <net/netlink.h>
	14	#include <net/pkt_sched.h>
e7e3728b QF	15	#include <net/ip.h>
	16	#include <net/ipv6.h>
	17	#include <net/dsfield.h>
ec7727bb	18	#include <net/pkt_cls.h>
ca9b0e27 AD	19
	20	#include <linux/tc_act/tc_skbedit.h>
	21	#include <net/tc_act/tc_skbedit.h>
	22
c7d03a00	23	static unsigned int skbedit_net_id;
a85a970a	24	static struct tc_action_ops act_skbedit_ops;
ddf97ccd	25
45da1dac JHS	26	static int tcf_skbedit_act(struct sk_buff skb, const struct tc_action a,
45da1dac JHS	27	struct tcf_result *res)
ca9b0e27	28	{
a85a970a	29	struct tcf_skbedit *d = to_skbedit(a);
c749cdda DC	30	struct tcf_skbedit_params *params;
c749cdda DC	31	int action;
ca9b0e27	32
9c4a4e48	33	tcf_lastuse_update(&d->tcf_tm);
6f3dfb0d	34	bstats_cpu_update(this_cpu_ptr(d->common.cpu_bstats), skb);
ca9b0e27	35
7fd4b288	36	params = rcu_dereference_bh(d->params);
c749cdda DC	37	action = READ_ONCE(d->tcf_action);
	38
	39	if (params->flags & SKBEDIT_F_PRIORITY)
	40	skb->priority = params->priority;
	41	if (params->flags & SKBEDIT_F_INHERITDSFIELD) {
e7e3728b QF	42	int wlen = skb_network_offset(skb);
	43
	44	switch (tc_skb_protocol(skb)) {
	45	case htons(ETH_P_IP):
	46	wlen += sizeof(struct iphdr);
	47	if (!pskb_may_pull(skb, wlen))
	48	goto err;
	49	skb->priority = ipv4_get_dsfield(ip_hdr(skb)) >> 2;
	50	break;
	51
	52	case htons(ETH_P_IPV6):
	53	wlen += sizeof(struct ipv6hdr);
	54	if (!pskb_may_pull(skb, wlen))
	55	goto err;
	56	skb->priority = ipv6_get_dsfield(ipv6_hdr(skb)) >> 2;
	57	break;
	58	}
	59	}
c749cdda DC	60	if (params->flags & SKBEDIT_F_QUEUE_MAPPING &&
	61	skb->dev->real_num_tx_queues > params->queue_mapping)
	62	skb_set_queue_mapping(skb, params->queue_mapping);
	63	if (params->flags & SKBEDIT_F_MARK) {
	64	skb->mark &= ~params->mask;
	65	skb->mark \|= params->mark & params->mask;
4fe77d82	66	}
c749cdda DC	67	if (params->flags & SKBEDIT_F_PTYPE)
c749cdda DC	68	skb->pkt_type = params->ptype;
c749cdda	69	return action;
7fd4b288	70
e7e3728b	71	err:
6f3dfb0d	72	qstats_drop_inc(this_cpu_ptr(d->common.cpu_qstats));
7fd4b288	73	return TC_ACT_SHOT;
ca9b0e27 AD	74	}
	75
	76	static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = {
	77	[TCA_SKBEDIT_PARMS] = { .len = sizeof(struct tc_skbedit) },
	78	[TCA_SKBEDIT_PRIORITY] = { .len = sizeof(u32) },
	79	[TCA_SKBEDIT_QUEUE_MAPPING] = { .len = sizeof(u16) },
1c55d62e	80	[TCA_SKBEDIT_MARK] = { .len = sizeof(u32) },
ff202ee1	81	[TCA_SKBEDIT_PTYPE] = { .len = sizeof(u16) },
4fe77d82	82	[TCA_SKBEDIT_MASK] = { .len = sizeof(u32) },
e7e3728b	83	[TCA_SKBEDIT_FLAGS] = { .len = sizeof(u64) },
ca9b0e27 AD	84	};
ca9b0e27 AD	85
c1b52739	86	static int tcf_skbedit_init(struct net net, struct nlattr nla,
a85a970a	87	struct nlattr est, struct tc_action *a,
789871bb	88	int ovr, int bind, bool rtnl_held,
85d0966f	89	struct tcf_proto *tp,
789871bb	90	struct netlink_ext_ack *extack)
ca9b0e27	91	{
ddf97ccd	92	struct tc_action_net *tn = net_generic(net, skbedit_net_id);
6d7a8df6	93	struct tcf_skbedit_params *params_new;
ca9b0e27	94	struct nlattr *tb[TCA_SKBEDIT_MAX + 1];
ec7727bb	95	struct tcf_chain *goto_ch = NULL;
ca9b0e27 AD	96	struct tc_skbedit *parm;
ca9b0e27 AD	97	struct tcf_skbedit *d;
4fe77d82	98	u32 flags = 0, priority = NULL, mark = NULL, *mask = NULL;
ff202ee1	99	u16 queue_mapping = NULL, ptype = NULL;
b2313077 WC	100	bool exists = false;
b2313077 WC	101	int ret = 0, err;
7be8ef2c	102	u32 index;
ca9b0e27 AD	103
	104	if (nla == NULL)
	105	return -EINVAL;
	106
8cb08174 JB	107	err = nla_parse_nested_deprecated(tb, TCA_SKBEDIT_MAX, nla,
8cb08174 JB	108	skbedit_policy, NULL);
ca9b0e27 AD	109	if (err < 0)
	110	return err;
	111
	112	if (tb[TCA_SKBEDIT_PARMS] == NULL)
	113	return -EINVAL;
	114
	115	if (tb[TCA_SKBEDIT_PRIORITY] != NULL) {
	116	flags \|= SKBEDIT_F_PRIORITY;
	117	priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]);
	118	}
	119
	120	if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) {
	121	flags \|= SKBEDIT_F_QUEUE_MAPPING;
	122	queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]);
	123	}
1c55d62e	124
ff202ee1 JHS	125	if (tb[TCA_SKBEDIT_PTYPE] != NULL) {
	126	ptype = nla_data(tb[TCA_SKBEDIT_PTYPE]);
	127	if (!skb_pkt_type_ok(*ptype))
	128	return -EINVAL;
	129	flags \|= SKBEDIT_F_PTYPE;
	130	}
	131
1c55d62e	132	if (tb[TCA_SKBEDIT_MARK] != NULL) {
	133	flags \|= SKBEDIT_F_MARK;
	134	mark = nla_data(tb[TCA_SKBEDIT_MARK]);
	135	}
	136
4fe77d82 AQ	137	if (tb[TCA_SKBEDIT_MASK] != NULL) {
	138	flags \|= SKBEDIT_F_MASK;
	139	mask = nla_data(tb[TCA_SKBEDIT_MASK]);
	140	}
	141
e7e3728b QF	142	if (tb[TCA_SKBEDIT_FLAGS] != NULL) {
	143	u64 *pure_flags = nla_data(tb[TCA_SKBEDIT_FLAGS]);
	144
	145	if (*pure_flags & SKBEDIT_F_INHERITDSFIELD)
	146	flags \|= SKBEDIT_F_INHERITDSFIELD;
	147	}
	148
ca9b0e27	149	parm = nla_data(tb[TCA_SKBEDIT_PARMS]);
7be8ef2c DL	150	index = parm->index;
7be8ef2c DL	151	err = tcf_idr_check_alloc(tn, &index, a, bind);
0190c1d4 VB	152	if (err < 0)
	153	return err;
	154	exists = err;
5e1567ae JHS	155	if (exists && bind)
	156	return 0;
	157
	158	if (!flags) {
af5d0184 RM	159	if (exists)
af5d0184 RM	160	tcf_idr_release(*a, bind);
0190c1d4	161	else
7be8ef2c	162	tcf_idr_cleanup(tn, index);
5e1567ae JHS	163	return -EINVAL;
	164	}
	165
	166	if (!exists) {
7be8ef2c	167	ret = tcf_idr_create(tn, index, est, a,
6f3dfb0d	168	&act_skbedit_ops, bind, true);
0190c1d4	169	if (ret) {
7be8ef2c	170	tcf_idr_cleanup(tn, index);
86062033	171	return ret;
0190c1d4	172	}
ca9b0e27	173
a85a970a	174	d = to_skbedit(*a);
ca9b0e27 AD	175	ret = ACT_P_CREATED;
ca9b0e27 AD	176	} else {
a85a970a	177	d = to_skbedit(*a);
4e8ddd7f VB	178	if (!ovr) {
4e8ddd7f VB	179	tcf_idr_release(*a, bind);
ca9b0e27	180	return -EEXIST;
4e8ddd7f	181	}
ca9b0e27	182	}
ec7727bb DC	183	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
	184	if (err < 0)
	185	goto release_idr;
ca9b0e27	186
c749cdda DC	187	params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
c749cdda DC	188	if (unlikely(!params_new)) {
ec7727bb DC	189	err = -ENOMEM;
ec7727bb DC	190	goto put_chain;
c749cdda DC	191	}
	192
	193	params_new->flags = flags;
ca9b0e27	194	if (flags & SKBEDIT_F_PRIORITY)
c749cdda	195	params_new->priority = *priority;
ca9b0e27	196	if (flags & SKBEDIT_F_QUEUE_MAPPING)
c749cdda	197	params_new->queue_mapping = *queue_mapping;
1c55d62e	198	if (flags & SKBEDIT_F_MARK)
c749cdda	199	params_new->mark = *mark;
ff202ee1	200	if (flags & SKBEDIT_F_PTYPE)
c749cdda	201	params_new->ptype = *ptype;
4fe77d82	202	/* default behaviour is to use all the bits */
c749cdda	203	params_new->mask = 0xffffffff;
4fe77d82	204	if (flags & SKBEDIT_F_MASK)
c749cdda	205	params_new->mask = *mask;
1c55d62e	206
6d7a8df6	207	spin_lock_bh(&d->tcf_lock);
ec7727bb	208	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
6d7a8df6 VB	209	rcu_swap_protected(d->params, params_new,
	210	lockdep_is_held(&d->tcf_lock));
	211	spin_unlock_bh(&d->tcf_lock);
	212	if (params_new)
	213	kfree_rcu(params_new, rcu);
ec7727bb DC	214	if (goto_ch)
ec7727bb DC	215	tcf_chain_put_by_act(goto_ch);
ca9b0e27 AD	216
ca9b0e27 AD	217	if (ret == ACT_P_CREATED)
65a206c0	218	tcf_idr_insert(tn, *a);
ca9b0e27	219	return ret;
ec7727bb DC	220	put_chain:
	221	if (goto_ch)
	222	tcf_chain_put_by_act(goto_ch);
	223	release_idr:
	224	tcf_idr_release(*a, bind);
	225	return err;
ca9b0e27 AD	226	}
ca9b0e27 AD	227
cc7ec456 ED	228	static int tcf_skbedit_dump(struct sk_buff skb, struct tc_action a,
cc7ec456 ED	229	int bind, int ref)
ca9b0e27 AD	230	{
ca9b0e27 AD	231	unsigned char *b = skb_tail_pointer(skb);
a85a970a	232	struct tcf_skbedit *d = to_skbedit(a);
c749cdda	233	struct tcf_skbedit_params *params;
1c40be12 ED	234	struct tc_skbedit opt = {
1c40be12 ED	235	.index = d->tcf_index,
036bb443 VB	236	.refcnt = refcount_read(&d->tcf_refcnt) - ref,
036bb443 VB	237	.bindcnt = atomic_read(&d->tcf_bindcnt) - bind,
1c40be12	238	};
e7e3728b	239	u64 pure_flags = 0;
c749cdda DC	240	struct tcf_t t;
c749cdda DC	241
6d7a8df6 VB	242	spin_lock_bh(&d->tcf_lock);
	243	params = rcu_dereference_protected(d->params,
	244	lockdep_is_held(&d->tcf_lock));
	245	opt.action = d->tcf_action;
ca9b0e27	246
1b34ec43 DM	247	if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt))
1b34ec43 DM	248	goto nla_put_failure;
c749cdda DC	249	if ((params->flags & SKBEDIT_F_PRIORITY) &&
c749cdda DC	250	nla_put_u32(skb, TCA_SKBEDIT_PRIORITY, params->priority))
1b34ec43	251	goto nla_put_failure;
c749cdda DC	252	if ((params->flags & SKBEDIT_F_QUEUE_MAPPING) &&
c749cdda DC	253	nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING, params->queue_mapping))
1b34ec43	254	goto nla_put_failure;
c749cdda DC	255	if ((params->flags & SKBEDIT_F_MARK) &&
c749cdda DC	256	nla_put_u32(skb, TCA_SKBEDIT_MARK, params->mark))
1b34ec43	257	goto nla_put_failure;
c749cdda DC	258	if ((params->flags & SKBEDIT_F_PTYPE) &&
c749cdda DC	259	nla_put_u16(skb, TCA_SKBEDIT_PTYPE, params->ptype))
ff202ee1	260	goto nla_put_failure;
c749cdda DC	261	if ((params->flags & SKBEDIT_F_MASK) &&
c749cdda DC	262	nla_put_u32(skb, TCA_SKBEDIT_MASK, params->mask))
4fe77d82	263	goto nla_put_failure;
c749cdda	264	if (params->flags & SKBEDIT_F_INHERITDSFIELD)
e7e3728b QF	265	pure_flags \|= SKBEDIT_F_INHERITDSFIELD;
	266	if (pure_flags != 0 &&
	267	nla_put(skb, TCA_SKBEDIT_FLAGS, sizeof(pure_flags), &pure_flags))
	268	goto nla_put_failure;
48d8ee16 JHS	269
48d8ee16 JHS	270	tcf_tm_dump(&t, &d->tcf_tm);
9854518e	271	if (nla_put_64bit(skb, TCA_SKBEDIT_TM, sizeof(t), &t, TCA_SKBEDIT_PAD))
1b34ec43	272	goto nla_put_failure;
6d7a8df6 VB	273	spin_unlock_bh(&d->tcf_lock);
6d7a8df6 VB	274
ca9b0e27 AD	275	return skb->len;
	276
	277	nla_put_failure:
6d7a8df6	278	spin_unlock_bh(&d->tcf_lock);
ca9b0e27 AD	279	nlmsg_trim(skb, b);
	280	return -1;
	281	}
	282
c749cdda DC	283	static void tcf_skbedit_cleanup(struct tc_action *a)
	284	{
	285	struct tcf_skbedit *d = to_skbedit(a);
	286	struct tcf_skbedit_params *params;
	287
	288	params = rcu_dereference_protected(d->params, 1);
	289	if (params)
	290	kfree_rcu(params, rcu);
	291	}
	292
ddf97ccd WC	293	static int tcf_skbedit_walker(struct net net, struct sk_buff skb,
ddf97ccd WC	294	struct netlink_callback *cb, int type,
41780105 AA	295	const struct tc_action_ops *ops,
41780105 AA	296	struct netlink_ext_ack *extack)
ddf97ccd WC	297	{
	298	struct tc_action_net *tn = net_generic(net, skbedit_net_id);
	299
b3620145	300	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
ddf97ccd WC	301	}
ddf97ccd WC	302
f061b48c	303	static int tcf_skbedit_search(struct net net, struct tc_action *a, u32 index)
ddf97ccd WC	304	{
	305	struct tc_action_net *tn = net_generic(net, skbedit_net_id);
	306
65a206c0	307	return tcf_idr_search(tn, a, index);
ddf97ccd WC	308	}
ddf97ccd WC	309
e1fea322 RM	310	static size_t tcf_skbedit_get_fill_size(const struct tc_action *act)
	311	{
	312	return nla_total_size(sizeof(struct tc_skbedit))
	313	+ nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_PRIORITY */
	314	+ nla_total_size(sizeof(u16)) /* TCA_SKBEDIT_QUEUE_MAPPING */
	315	+ nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_MARK */
	316	+ nla_total_size(sizeof(u16)) /* TCA_SKBEDIT_PTYPE */
	317	+ nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_MASK */
	318	+ nla_total_size_64bit(sizeof(u64)); /* TCA_SKBEDIT_FLAGS */
	319	}
	320
ca9b0e27 AD	321	static struct tc_action_ops act_skbedit_ops = {
ca9b0e27 AD	322	.kind = "skbedit",
eddd2cf1	323	.id = TCA_ID_SKBEDIT,
ca9b0e27	324	.owner = THIS_MODULE,
45da1dac	325	.act = tcf_skbedit_act,
ca9b0e27	326	.dump = tcf_skbedit_dump,
ca9b0e27	327	.init = tcf_skbedit_init,
c749cdda	328	.cleanup = tcf_skbedit_cleanup,
ddf97ccd	329	.walk = tcf_skbedit_walker,
e1fea322	330	.get_fill_size = tcf_skbedit_get_fill_size,
ddf97ccd	331	.lookup = tcf_skbedit_search,
a85a970a	332	.size = sizeof(struct tcf_skbedit),
ddf97ccd WC	333	};
	334
	335	static __net_init int skbedit_init_net(struct net *net)
	336	{
	337	struct tc_action_net *tn = net_generic(net, skbedit_net_id);
	338
981471bd	339	return tc_action_net_init(net, tn, &act_skbedit_ops);
ddf97ccd WC	340	}
ddf97ccd WC	341
039af9c6	342	static void __net_exit skbedit_exit_net(struct list_head *net_list)
ddf97ccd	343	{
039af9c6	344	tc_action_net_exit(net_list, skbedit_net_id);
ddf97ccd WC	345	}
	346
	347	static struct pernet_operations skbedit_net_ops = {
	348	.init = skbedit_init_net,
039af9c6	349	.exit_batch = skbedit_exit_net,
ddf97ccd WC	350	.id = &skbedit_net_id,
ddf97ccd WC	351	.size = sizeof(struct tc_action_net),
ca9b0e27 AD	352	};
	353
	354	MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>");
	355	MODULE_DESCRIPTION("SKB Editing");
	356	MODULE_LICENSE("GPL");
	357
	358	static int __init skbedit_init_module(void)
	359	{
ddf97ccd	360	return tcf_register_action(&act_skbedit_ops, &skbedit_net_ops);
ca9b0e27 AD	361	}
	362
	363	static void __exit skbedit_cleanup_module(void)
	364	{
ddf97ccd	365	tcf_unregister_action(&act_skbedit_ops, &skbedit_net_ops);
ca9b0e27 AD	366	}
	367
	368	module_init(skbedit_init_module);
	369	module_exit(skbedit_cleanup_module);