[mirror_ubuntu-jammy-kernel.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 (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);
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);
e7e3728b QF	43
d7bf2ebe	44	switch (skb_protocol(skb, true)) {
e7e3728b QF	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	}
ca9b0e27 AD	75
837cb17d	76	static void tcf_skbedit_stats_update(struct tc_action *a, u64 bytes,
4b61d3e8 PL	77	u64 packets, u64 drops,
4b61d3e8 PL	78	u64 lastuse, bool hw)
837cb17d PM	79	{
	80	struct tcf_skbedit *d = to_skbedit(a);
	81	struct tcf_t *tm = &d->tcf_tm;
	82
4b61d3e8	83	tcf_action_update_stats(a, bytes, packets, drops, hw);
837cb17d PM	84	tm->lastuse = max_t(u64, tm->lastuse, lastuse);
	85	}
	86
ca9b0e27 AD	87	static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = {
	88	[TCA_SKBEDIT_PARMS] = { .len = sizeof(struct tc_skbedit) },
	89	[TCA_SKBEDIT_PRIORITY] = { .len = sizeof(u32) },
	90	[TCA_SKBEDIT_QUEUE_MAPPING] = { .len = sizeof(u16) },
1c55d62e	91	[TCA_SKBEDIT_MARK] = { .len = sizeof(u32) },
ff202ee1	92	[TCA_SKBEDIT_PTYPE] = { .len = sizeof(u16) },
4fe77d82	93	[TCA_SKBEDIT_MASK] = { .len = sizeof(u32) },
e7e3728b	94	[TCA_SKBEDIT_FLAGS] = { .len = sizeof(u64) },
ca9b0e27 AD	95	};
ca9b0e27 AD	96
c1b52739	97	static int tcf_skbedit_init(struct net net, struct nlattr nla,
a85a970a	98	struct nlattr est, struct tc_action *a,
789871bb	99	int ovr, int bind, bool rtnl_held,
abbb0d33	100	struct tcf_proto *tp, u32 act_flags,
789871bb	101	struct netlink_ext_ack *extack)
ca9b0e27	102	{
ddf97ccd	103	struct tc_action_net *tn = net_generic(net, skbedit_net_id);
6d7a8df6	104	struct tcf_skbedit_params *params_new;
ca9b0e27	105	struct nlattr *tb[TCA_SKBEDIT_MAX + 1];
ec7727bb	106	struct tcf_chain *goto_ch = NULL;
ca9b0e27 AD	107	struct tc_skbedit *parm;
ca9b0e27 AD	108	struct tcf_skbedit *d;
4fe77d82	109	u32 flags = 0, priority = NULL, mark = NULL, *mask = NULL;
ff202ee1	110	u16 queue_mapping = NULL, ptype = NULL;
b2313077 WC	111	bool exists = false;
b2313077 WC	112	int ret = 0, err;
7be8ef2c	113	u32 index;
ca9b0e27 AD	114
	115	if (nla == NULL)
	116	return -EINVAL;
	117
8cb08174 JB	118	err = nla_parse_nested_deprecated(tb, TCA_SKBEDIT_MAX, nla,
8cb08174 JB	119	skbedit_policy, NULL);
ca9b0e27 AD	120	if (err < 0)
	121	return err;
	122
	123	if (tb[TCA_SKBEDIT_PARMS] == NULL)
	124	return -EINVAL;
	125
	126	if (tb[TCA_SKBEDIT_PRIORITY] != NULL) {
	127	flags \|= SKBEDIT_F_PRIORITY;
	128	priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]);
	129	}
	130
	131	if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) {
	132	flags \|= SKBEDIT_F_QUEUE_MAPPING;
	133	queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]);
	134	}
1c55d62e	135
ff202ee1 JHS	136	if (tb[TCA_SKBEDIT_PTYPE] != NULL) {
	137	ptype = nla_data(tb[TCA_SKBEDIT_PTYPE]);
	138	if (!skb_pkt_type_ok(*ptype))
	139	return -EINVAL;
	140	flags \|= SKBEDIT_F_PTYPE;
	141	}
	142
1c55d62e	143	if (tb[TCA_SKBEDIT_MARK] != NULL) {
	144	flags \|= SKBEDIT_F_MARK;
	145	mark = nla_data(tb[TCA_SKBEDIT_MARK]);
	146	}
	147
4fe77d82 AQ	148	if (tb[TCA_SKBEDIT_MASK] != NULL) {
	149	flags \|= SKBEDIT_F_MASK;
	150	mask = nla_data(tb[TCA_SKBEDIT_MASK]);
	151	}
	152
e7e3728b QF	153	if (tb[TCA_SKBEDIT_FLAGS] != NULL) {
	154	u64 *pure_flags = nla_data(tb[TCA_SKBEDIT_FLAGS]);
	155
	156	if (*pure_flags & SKBEDIT_F_INHERITDSFIELD)
	157	flags \|= SKBEDIT_F_INHERITDSFIELD;
	158	}
	159
ca9b0e27	160	parm = nla_data(tb[TCA_SKBEDIT_PARMS]);
7be8ef2c DL	161	index = parm->index;
7be8ef2c DL	162	err = tcf_idr_check_alloc(tn, &index, a, bind);
0190c1d4 VB	163	if (err < 0)
	164	return err;
	165	exists = err;
5e1567ae JHS	166	if (exists && bind)
	167	return 0;
	168
	169	if (!flags) {
af5d0184 RM	170	if (exists)
af5d0184 RM	171	tcf_idr_release(*a, bind);
0190c1d4	172	else
7be8ef2c	173	tcf_idr_cleanup(tn, index);
5e1567ae JHS	174	return -EINVAL;
	175	}
	176
	177	if (!exists) {
7be8ef2c	178	ret = tcf_idr_create(tn, index, est, a,
e3822678	179	&act_skbedit_ops, bind, true, 0);
0190c1d4	180	if (ret) {
7be8ef2c	181	tcf_idr_cleanup(tn, index);
86062033	182	return ret;
0190c1d4	183	}
ca9b0e27	184
a85a970a	185	d = to_skbedit(*a);
ca9b0e27 AD	186	ret = ACT_P_CREATED;
ca9b0e27 AD	187	} else {
a85a970a	188	d = to_skbedit(*a);
4e8ddd7f VB	189	if (!ovr) {
4e8ddd7f VB	190	tcf_idr_release(*a, bind);
ca9b0e27	191	return -EEXIST;
4e8ddd7f	192	}
ca9b0e27	193	}
ec7727bb DC	194	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
	195	if (err < 0)
	196	goto release_idr;
ca9b0e27	197
c749cdda DC	198	params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
c749cdda DC	199	if (unlikely(!params_new)) {
ec7727bb DC	200	err = -ENOMEM;
ec7727bb DC	201	goto put_chain;
c749cdda DC	202	}
	203
	204	params_new->flags = flags;
ca9b0e27	205	if (flags & SKBEDIT_F_PRIORITY)
c749cdda	206	params_new->priority = *priority;
ca9b0e27	207	if (flags & SKBEDIT_F_QUEUE_MAPPING)
c749cdda	208	params_new->queue_mapping = *queue_mapping;
1c55d62e	209	if (flags & SKBEDIT_F_MARK)
c749cdda	210	params_new->mark = *mark;
ff202ee1	211	if (flags & SKBEDIT_F_PTYPE)
c749cdda	212	params_new->ptype = *ptype;
4fe77d82	213	/* default behaviour is to use all the bits */
c749cdda	214	params_new->mask = 0xffffffff;
4fe77d82	215	if (flags & SKBEDIT_F_MASK)
c749cdda	216	params_new->mask = *mask;
1c55d62e	217
6d7a8df6	218	spin_lock_bh(&d->tcf_lock);
ec7727bb	219	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
445d3749 PM	220	params_new = rcu_replace_pointer(d->params, params_new,
445d3749 PM	221	lockdep_is_held(&d->tcf_lock));
6d7a8df6 VB	222	spin_unlock_bh(&d->tcf_lock);
	223	if (params_new)
	224	kfree_rcu(params_new, rcu);
ec7727bb DC	225	if (goto_ch)
ec7727bb DC	226	tcf_chain_put_by_act(goto_ch);
ca9b0e27 AD	227
ca9b0e27 AD	228	if (ret == ACT_P_CREATED)
65a206c0	229	tcf_idr_insert(tn, *a);
ca9b0e27	230	return ret;
ec7727bb DC	231	put_chain:
	232	if (goto_ch)
	233	tcf_chain_put_by_act(goto_ch);
	234	release_idr:
	235	tcf_idr_release(*a, bind);
	236	return err;
ca9b0e27 AD	237	}
ca9b0e27 AD	238
cc7ec456 ED	239	static int tcf_skbedit_dump(struct sk_buff skb, struct tc_action a,
cc7ec456 ED	240	int bind, int ref)
ca9b0e27 AD	241	{
ca9b0e27 AD	242	unsigned char *b = skb_tail_pointer(skb);
a85a970a	243	struct tcf_skbedit *d = to_skbedit(a);
c749cdda	244	struct tcf_skbedit_params *params;
1c40be12 ED	245	struct tc_skbedit opt = {
1c40be12 ED	246	.index = d->tcf_index,
036bb443 VB	247	.refcnt = refcount_read(&d->tcf_refcnt) - ref,
036bb443 VB	248	.bindcnt = atomic_read(&d->tcf_bindcnt) - bind,
1c40be12	249	};
e7e3728b	250	u64 pure_flags = 0;
c749cdda DC	251	struct tcf_t t;
c749cdda DC	252
6d7a8df6 VB	253	spin_lock_bh(&d->tcf_lock);
	254	params = rcu_dereference_protected(d->params,
	255	lockdep_is_held(&d->tcf_lock));
	256	opt.action = d->tcf_action;
ca9b0e27	257
1b34ec43 DM	258	if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt))
1b34ec43 DM	259	goto nla_put_failure;
c749cdda DC	260	if ((params->flags & SKBEDIT_F_PRIORITY) &&
c749cdda DC	261	nla_put_u32(skb, TCA_SKBEDIT_PRIORITY, params->priority))
1b34ec43	262	goto nla_put_failure;
c749cdda DC	263	if ((params->flags & SKBEDIT_F_QUEUE_MAPPING) &&
c749cdda DC	264	nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING, params->queue_mapping))
1b34ec43	265	goto nla_put_failure;
c749cdda DC	266	if ((params->flags & SKBEDIT_F_MARK) &&
c749cdda DC	267	nla_put_u32(skb, TCA_SKBEDIT_MARK, params->mark))
1b34ec43	268	goto nla_put_failure;
c749cdda DC	269	if ((params->flags & SKBEDIT_F_PTYPE) &&
c749cdda DC	270	nla_put_u16(skb, TCA_SKBEDIT_PTYPE, params->ptype))
ff202ee1	271	goto nla_put_failure;
c749cdda DC	272	if ((params->flags & SKBEDIT_F_MASK) &&
c749cdda DC	273	nla_put_u32(skb, TCA_SKBEDIT_MASK, params->mask))
4fe77d82	274	goto nla_put_failure;
c749cdda	275	if (params->flags & SKBEDIT_F_INHERITDSFIELD)
e7e3728b QF	276	pure_flags \|= SKBEDIT_F_INHERITDSFIELD;
	277	if (pure_flags != 0 &&
	278	nla_put(skb, TCA_SKBEDIT_FLAGS, sizeof(pure_flags), &pure_flags))
	279	goto nla_put_failure;
48d8ee16 JHS	280
48d8ee16 JHS	281	tcf_tm_dump(&t, &d->tcf_tm);
9854518e	282	if (nla_put_64bit(skb, TCA_SKBEDIT_TM, sizeof(t), &t, TCA_SKBEDIT_PAD))
1b34ec43	283	goto nla_put_failure;
6d7a8df6 VB	284	spin_unlock_bh(&d->tcf_lock);
6d7a8df6 VB	285
ca9b0e27 AD	286	return skb->len;
	287
	288	nla_put_failure:
6d7a8df6	289	spin_unlock_bh(&d->tcf_lock);
ca9b0e27 AD	290	nlmsg_trim(skb, b);
	291	return -1;
	292	}
	293
c749cdda DC	294	static void tcf_skbedit_cleanup(struct tc_action *a)
	295	{
	296	struct tcf_skbedit *d = to_skbedit(a);
	297	struct tcf_skbedit_params *params;
	298
	299	params = rcu_dereference_protected(d->params, 1);
	300	if (params)
	301	kfree_rcu(params, rcu);
	302	}
	303
ddf97ccd WC	304	static int tcf_skbedit_walker(struct net net, struct sk_buff skb,
ddf97ccd WC	305	struct netlink_callback *cb, int type,
41780105 AA	306	const struct tc_action_ops *ops,
41780105 AA	307	struct netlink_ext_ack *extack)
ddf97ccd WC	308	{
	309	struct tc_action_net *tn = net_generic(net, skbedit_net_id);
	310
b3620145	311	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
ddf97ccd WC	312	}
ddf97ccd WC	313
f061b48c	314	static int tcf_skbedit_search(struct net net, struct tc_action *a, u32 index)
ddf97ccd WC	315	{
	316	struct tc_action_net *tn = net_generic(net, skbedit_net_id);
	317
65a206c0	318	return tcf_idr_search(tn, a, index);
ddf97ccd WC	319	}
ddf97ccd WC	320
e1fea322 RM	321	static size_t tcf_skbedit_get_fill_size(const struct tc_action *act)
	322	{
	323	return nla_total_size(sizeof(struct tc_skbedit))
	324	+ nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_PRIORITY */
	325	+ nla_total_size(sizeof(u16)) /* TCA_SKBEDIT_QUEUE_MAPPING */
	326	+ nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_MARK */
	327	+ nla_total_size(sizeof(u16)) /* TCA_SKBEDIT_PTYPE */
	328	+ nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_MASK */
	329	+ nla_total_size_64bit(sizeof(u64)); /* TCA_SKBEDIT_FLAGS */
	330	}
	331
ca9b0e27 AD	332	static struct tc_action_ops act_skbedit_ops = {
ca9b0e27 AD	333	.kind = "skbedit",
eddd2cf1	334	.id = TCA_ID_SKBEDIT,
ca9b0e27	335	.owner = THIS_MODULE,
45da1dac	336	.act = tcf_skbedit_act,
837cb17d	337	.stats_update = tcf_skbedit_stats_update,
ca9b0e27	338	.dump = tcf_skbedit_dump,
ca9b0e27	339	.init = tcf_skbedit_init,
c749cdda	340	.cleanup = tcf_skbedit_cleanup,
ddf97ccd	341	.walk = tcf_skbedit_walker,
e1fea322	342	.get_fill_size = tcf_skbedit_get_fill_size,
ddf97ccd	343	.lookup = tcf_skbedit_search,
a85a970a	344	.size = sizeof(struct tcf_skbedit),
ddf97ccd WC	345	};
	346
	347	static __net_init int skbedit_init_net(struct net *net)
	348	{
	349	struct tc_action_net *tn = net_generic(net, skbedit_net_id);
	350
981471bd	351	return tc_action_net_init(net, tn, &act_skbedit_ops);
ddf97ccd WC	352	}
ddf97ccd WC	353
039af9c6	354	static void __net_exit skbedit_exit_net(struct list_head *net_list)
ddf97ccd	355	{
039af9c6	356	tc_action_net_exit(net_list, skbedit_net_id);
ddf97ccd WC	357	}
	358
	359	static struct pernet_operations skbedit_net_ops = {
	360	.init = skbedit_init_net,
039af9c6	361	.exit_batch = skbedit_exit_net,
ddf97ccd WC	362	.id = &skbedit_net_id,
ddf97ccd WC	363	.size = sizeof(struct tc_action_net),
ca9b0e27 AD	364	};
	365
	366	MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>");
	367	MODULE_DESCRIPTION("SKB Editing");
	368	MODULE_LICENSE("GPL");
	369
	370	static int __init skbedit_init_module(void)
	371	{
ddf97ccd	372	return tcf_register_action(&act_skbedit_ops, &skbedit_net_ops);
ca9b0e27 AD	373	}
	374
	375	static void __exit skbedit_cleanup_module(void)
	376	{
ddf97ccd	377	tcf_unregister_action(&act_skbedit_ops, &skbedit_net_ops);
ca9b0e27 AD	378	}
	379
	380	module_init(skbedit_init_module);
	381	module_exit(skbedit_cleanup_module);