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

/*
 * Copyright (c) 2008, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, see <http://www.gnu.org/licenses/>.
 *
 * 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 <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 netlink_ext_ack *extack)
{
	struct tc_action_net *tn = net_generic(net, skbedit_net_id);
	struct tcf_skbedit_params *params_old, *params_new;
	struct nlattr *tb[TCA_SKBEDIT_MAX + 1];
	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;

	if (nla == NULL)
		return -EINVAL;

	err = nla_parse_nested(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]);

	err = tcf_idr_check_alloc(tn, &parm->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, parm->index);
		return -EINVAL;
	}

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

	ASSERT_RTNL();

	params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
	if (unlikely(!params_new)) {
		if (ret == ACT_P_CREATED)
			tcf_idr_release(*a, bind);
		return -ENOMEM;
	}

	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;

	d->tcf_action = parm->action;
	params_old = rtnl_dereference(d->params);
	rcu_assign_pointer(d->params, params_new);
	if (params_old)
		kfree_rcu(params_old, rcu);

	if (ret == ACT_P_CREATED)
		tcf_idr_insert(tn, *a);
	return ret;
}

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,
		.action  = d->tcf_action,
	};
	u64 pure_flags = 0;
	struct tcf_t t;

	params = rtnl_dereference(d->params);

	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;
	return skb->len;

nla_put_failure:
	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 netlink_ext_ack *extack)
{
	struct tc_action_net *tn = net_generic(net, skbedit_net_id);

	return tcf_idr_search(tn, a, index);
}

static struct tc_action_ops act_skbedit_ops = {
	.kind		=	"skbedit",
	.type		=	TCA_ACT_SKBEDIT,
	.owner		=	THIS_MODULE,
	.act		=	tcf_skbedit_act,
	.dump		=	tcf_skbedit_dump,
	.init		=	tcf_skbedit_init,
	.cleanup	=	tcf_skbedit_cleanup,
	.walk		=	tcf_skbedit_walker,
	.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(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
ca9b0e27 AD	1	/*
	2	* Copyright (c) 2008, Intel Corporation.
	3	*
	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms and conditions of the GNU General Public License,
	6	* version 2, as published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope it will be useful, but WITHOUT
	9	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	10	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	11	* more details.
	12	*
	13	* You should have received a copy of the GNU General Public License along with
c057b190	14	* this program; if not, see <http://www.gnu.org/licenses/>.
ca9b0e27 AD	15	*
	16	* Author: Alexander Duyck <alexander.h.duyck@intel.com>
	17	*/
	18
	19	#include <linux/module.h>
	20	#include <linux/init.h>
	21	#include <linux/kernel.h>
	22	#include <linux/skbuff.h>
	23	#include <linux/rtnetlink.h>
	24	#include <net/netlink.h>
	25	#include <net/pkt_sched.h>
e7e3728b QF	26	#include <net/ip.h>
	27	#include <net/ipv6.h>
	28	#include <net/dsfield.h>
ca9b0e27 AD	29
	30	#include <linux/tc_act/tc_skbedit.h>
	31	#include <net/tc_act/tc_skbedit.h>
	32
c7d03a00	33	static unsigned int skbedit_net_id;
a85a970a	34	static struct tc_action_ops act_skbedit_ops;
ddf97ccd	35
45da1dac JHS	36	static int tcf_skbedit_act(struct sk_buff skb, const struct tc_action a,
45da1dac JHS	37	struct tcf_result *res)
ca9b0e27	38	{
a85a970a	39	struct tcf_skbedit *d = to_skbedit(a);
c749cdda DC	40	struct tcf_skbedit_params *params;
c749cdda DC	41	int action;
ca9b0e27	42
9c4a4e48	43	tcf_lastuse_update(&d->tcf_tm);
6f3dfb0d	44	bstats_cpu_update(this_cpu_ptr(d->common.cpu_bstats), skb);
ca9b0e27	45
7fd4b288	46	params = rcu_dereference_bh(d->params);
c749cdda DC	47	action = READ_ONCE(d->tcf_action);
	48
	49	if (params->flags & SKBEDIT_F_PRIORITY)
	50	skb->priority = params->priority;
	51	if (params->flags & SKBEDIT_F_INHERITDSFIELD) {
e7e3728b QF	52	int wlen = skb_network_offset(skb);
	53
	54	switch (tc_skb_protocol(skb)) {
	55	case htons(ETH_P_IP):
	56	wlen += sizeof(struct iphdr);
	57	if (!pskb_may_pull(skb, wlen))
	58	goto err;
	59	skb->priority = ipv4_get_dsfield(ip_hdr(skb)) >> 2;
	60	break;
	61
	62	case htons(ETH_P_IPV6):
	63	wlen += sizeof(struct ipv6hdr);
	64	if (!pskb_may_pull(skb, wlen))
	65	goto err;
	66	skb->priority = ipv6_get_dsfield(ipv6_hdr(skb)) >> 2;
	67	break;
	68	}
	69	}
c749cdda DC	70	if (params->flags & SKBEDIT_F_QUEUE_MAPPING &&
	71	skb->dev->real_num_tx_queues > params->queue_mapping)
	72	skb_set_queue_mapping(skb, params->queue_mapping);
	73	if (params->flags & SKBEDIT_F_MARK) {
	74	skb->mark &= ~params->mask;
	75	skb->mark \|= params->mark & params->mask;
4fe77d82	76	}
c749cdda DC	77	if (params->flags & SKBEDIT_F_PTYPE)
c749cdda DC	78	skb->pkt_type = params->ptype;
c749cdda	79	return action;
7fd4b288	80
e7e3728b	81	err:
6f3dfb0d	82	qstats_drop_inc(this_cpu_ptr(d->common.cpu_qstats));
7fd4b288	83	return TC_ACT_SHOT;
ca9b0e27 AD	84	}
	85
	86	static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = {
	87	[TCA_SKBEDIT_PARMS] = { .len = sizeof(struct tc_skbedit) },
	88	[TCA_SKBEDIT_PRIORITY] = { .len = sizeof(u32) },
	89	[TCA_SKBEDIT_QUEUE_MAPPING] = { .len = sizeof(u16) },
1c55d62e	90	[TCA_SKBEDIT_MARK] = { .len = sizeof(u32) },
ff202ee1	91	[TCA_SKBEDIT_PTYPE] = { .len = sizeof(u16) },
4fe77d82	92	[TCA_SKBEDIT_MASK] = { .len = sizeof(u32) },
e7e3728b	93	[TCA_SKBEDIT_FLAGS] = { .len = sizeof(u64) },
ca9b0e27 AD	94	};
ca9b0e27 AD	95
c1b52739	96	static int tcf_skbedit_init(struct net net, struct nlattr nla,
a85a970a	97	struct nlattr est, struct tc_action *a,
789871bb VB	98	int ovr, int bind, bool rtnl_held,
789871bb VB	99	struct netlink_ext_ack *extack)
ca9b0e27	100	{
ddf97ccd	101	struct tc_action_net *tn = net_generic(net, skbedit_net_id);
c749cdda	102	struct tcf_skbedit_params params_old, params_new;
ca9b0e27 AD	103	struct nlattr *tb[TCA_SKBEDIT_MAX + 1];
	104	struct tc_skbedit *parm;
	105	struct tcf_skbedit *d;
4fe77d82	106	u32 flags = 0, priority = NULL, mark = NULL, *mask = NULL;
ff202ee1	107	u16 queue_mapping = NULL, ptype = NULL;
b2313077 WC	108	bool exists = false;
b2313077 WC	109	int ret = 0, err;
ca9b0e27 AD	110
	111	if (nla == NULL)
	112	return -EINVAL;
	113
fceb6435	114	err = nla_parse_nested(tb, TCA_SKBEDIT_MAX, nla, skbedit_policy, NULL);
ca9b0e27 AD	115	if (err < 0)
	116	return err;
	117
	118	if (tb[TCA_SKBEDIT_PARMS] == NULL)
	119	return -EINVAL;
	120
	121	if (tb[TCA_SKBEDIT_PRIORITY] != NULL) {
	122	flags \|= SKBEDIT_F_PRIORITY;
	123	priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]);
	124	}
	125
	126	if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) {
	127	flags \|= SKBEDIT_F_QUEUE_MAPPING;
	128	queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]);
	129	}
1c55d62e	130
ff202ee1 JHS	131	if (tb[TCA_SKBEDIT_PTYPE] != NULL) {
	132	ptype = nla_data(tb[TCA_SKBEDIT_PTYPE]);
	133	if (!skb_pkt_type_ok(*ptype))
	134	return -EINVAL;
	135	flags \|= SKBEDIT_F_PTYPE;
	136	}
	137
1c55d62e	138	if (tb[TCA_SKBEDIT_MARK] != NULL) {
	139	flags \|= SKBEDIT_F_MARK;
	140	mark = nla_data(tb[TCA_SKBEDIT_MARK]);
	141	}
	142
4fe77d82 AQ	143	if (tb[TCA_SKBEDIT_MASK] != NULL) {
	144	flags \|= SKBEDIT_F_MASK;
	145	mask = nla_data(tb[TCA_SKBEDIT_MASK]);
	146	}
	147
e7e3728b QF	148	if (tb[TCA_SKBEDIT_FLAGS] != NULL) {
	149	u64 *pure_flags = nla_data(tb[TCA_SKBEDIT_FLAGS]);
	150
	151	if (*pure_flags & SKBEDIT_F_INHERITDSFIELD)
	152	flags \|= SKBEDIT_F_INHERITDSFIELD;
	153	}
	154
ca9b0e27 AD	155	parm = nla_data(tb[TCA_SKBEDIT_PARMS]);
ca9b0e27 AD	156
0190c1d4 VB	157	err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
	158	if (err < 0)
	159	return err;
	160	exists = err;
5e1567ae JHS	161	if (exists && bind)
	162	return 0;
	163
	164	if (!flags) {
af5d0184 RM	165	if (exists)
af5d0184 RM	166	tcf_idr_release(*a, bind);
0190c1d4 VB	167	else
0190c1d4 VB	168	tcf_idr_cleanup(tn, parm->index);
5e1567ae JHS	169	return -EINVAL;
	170	}
	171
	172	if (!exists) {
65a206c0	173	ret = tcf_idr_create(tn, parm->index, est, a,
6f3dfb0d	174	&act_skbedit_ops, bind, true);
0190c1d4 VB	175	if (ret) {
0190c1d4 VB	176	tcf_idr_cleanup(tn, parm->index);
86062033	177	return ret;
0190c1d4	178	}
ca9b0e27	179
a85a970a	180	d = to_skbedit(*a);
ca9b0e27 AD	181	ret = ACT_P_CREATED;
ca9b0e27 AD	182	} else {
a85a970a	183	d = to_skbedit(*a);
4e8ddd7f VB	184	if (!ovr) {
4e8ddd7f VB	185	tcf_idr_release(*a, bind);
ca9b0e27	186	return -EEXIST;
4e8ddd7f	187	}
ca9b0e27 AD	188	}
ca9b0e27 AD	189
c749cdda	190	ASSERT_RTNL();
ca9b0e27	191
c749cdda DC	192	params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
	193	if (unlikely(!params_new)) {
	194	if (ret == ACT_P_CREATED)
	195	tcf_idr_release(*a, bind);
	196	return -ENOMEM;
	197	}
	198
	199	params_new->flags = flags;
ca9b0e27	200	if (flags & SKBEDIT_F_PRIORITY)
c749cdda	201	params_new->priority = *priority;
ca9b0e27	202	if (flags & SKBEDIT_F_QUEUE_MAPPING)
c749cdda	203	params_new->queue_mapping = *queue_mapping;
1c55d62e	204	if (flags & SKBEDIT_F_MARK)
c749cdda	205	params_new->mark = *mark;
ff202ee1	206	if (flags & SKBEDIT_F_PTYPE)
c749cdda	207	params_new->ptype = *ptype;
4fe77d82	208	/* default behaviour is to use all the bits */
c749cdda	209	params_new->mask = 0xffffffff;
4fe77d82	210	if (flags & SKBEDIT_F_MASK)
c749cdda	211	params_new->mask = *mask;
1c55d62e	212
ca9b0e27	213	d->tcf_action = parm->action;
c749cdda DC	214	params_old = rtnl_dereference(d->params);
	215	rcu_assign_pointer(d->params, params_new);
	216	if (params_old)
	217	kfree_rcu(params_old, rcu);
ca9b0e27 AD	218
ca9b0e27 AD	219	if (ret == ACT_P_CREATED)
65a206c0	220	tcf_idr_insert(tn, *a);
ca9b0e27 AD	221	return ret;
	222	}
	223
cc7ec456 ED	224	static int tcf_skbedit_dump(struct sk_buff skb, struct tc_action a,
cc7ec456 ED	225	int bind, int ref)
ca9b0e27 AD	226	{
ca9b0e27 AD	227	unsigned char *b = skb_tail_pointer(skb);
a85a970a	228	struct tcf_skbedit *d = to_skbedit(a);
c749cdda	229	struct tcf_skbedit_params *params;
1c40be12 ED	230	struct tc_skbedit opt = {
1c40be12 ED	231	.index = d->tcf_index,
036bb443 VB	232	.refcnt = refcount_read(&d->tcf_refcnt) - ref,
036bb443 VB	233	.bindcnt = atomic_read(&d->tcf_bindcnt) - bind,
1c40be12 ED	234	.action = d->tcf_action,
1c40be12 ED	235	};
e7e3728b	236	u64 pure_flags = 0;
c749cdda DC	237	struct tcf_t t;
	238
	239	params = rtnl_dereference(d->params);
ca9b0e27	240
1b34ec43 DM	241	if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt))
1b34ec43 DM	242	goto nla_put_failure;
c749cdda DC	243	if ((params->flags & SKBEDIT_F_PRIORITY) &&
c749cdda DC	244	nla_put_u32(skb, TCA_SKBEDIT_PRIORITY, params->priority))
1b34ec43	245	goto nla_put_failure;
c749cdda DC	246	if ((params->flags & SKBEDIT_F_QUEUE_MAPPING) &&
c749cdda DC	247	nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING, params->queue_mapping))
1b34ec43	248	goto nla_put_failure;
c749cdda DC	249	if ((params->flags & SKBEDIT_F_MARK) &&
c749cdda DC	250	nla_put_u32(skb, TCA_SKBEDIT_MARK, params->mark))
1b34ec43	251	goto nla_put_failure;
c749cdda DC	252	if ((params->flags & SKBEDIT_F_PTYPE) &&
c749cdda DC	253	nla_put_u16(skb, TCA_SKBEDIT_PTYPE, params->ptype))
ff202ee1	254	goto nla_put_failure;
c749cdda DC	255	if ((params->flags & SKBEDIT_F_MASK) &&
c749cdda DC	256	nla_put_u32(skb, TCA_SKBEDIT_MASK, params->mask))
4fe77d82	257	goto nla_put_failure;
c749cdda	258	if (params->flags & SKBEDIT_F_INHERITDSFIELD)
e7e3728b QF	259	pure_flags \|= SKBEDIT_F_INHERITDSFIELD;
	260	if (pure_flags != 0 &&
	261	nla_put(skb, TCA_SKBEDIT_FLAGS, sizeof(pure_flags), &pure_flags))
	262	goto nla_put_failure;
48d8ee16 JHS	263
48d8ee16 JHS	264	tcf_tm_dump(&t, &d->tcf_tm);
9854518e	265	if (nla_put_64bit(skb, TCA_SKBEDIT_TM, sizeof(t), &t, TCA_SKBEDIT_PAD))
1b34ec43	266	goto nla_put_failure;
ca9b0e27 AD	267	return skb->len;
	268
	269	nla_put_failure:
	270	nlmsg_trim(skb, b);
	271	return -1;
	272	}
	273
c749cdda DC	274	static void tcf_skbedit_cleanup(struct tc_action *a)
	275	{
	276	struct tcf_skbedit *d = to_skbedit(a);
	277	struct tcf_skbedit_params *params;
	278
	279	params = rcu_dereference_protected(d->params, 1);
	280	if (params)
	281	kfree_rcu(params, rcu);
	282	}
	283
ddf97ccd WC	284	static int tcf_skbedit_walker(struct net net, struct sk_buff skb,
ddf97ccd WC	285	struct netlink_callback *cb, int type,
41780105 AA	286	const struct tc_action_ops *ops,
41780105 AA	287	struct netlink_ext_ack *extack)
ddf97ccd WC	288	{
	289	struct tc_action_net *tn = net_generic(net, skbedit_net_id);
	290
b3620145	291	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
ddf97ccd WC	292	}
ddf97ccd WC	293
331a9295 AA	294	static int tcf_skbedit_search(struct net net, struct tc_action *a, u32 index,
331a9295 AA	295	struct netlink_ext_ack *extack)
ddf97ccd WC	296	{
	297	struct tc_action_net *tn = net_generic(net, skbedit_net_id);
	298
65a206c0	299	return tcf_idr_search(tn, a, index);
ddf97ccd WC	300	}
ddf97ccd WC	301
ca9b0e27 AD	302	static struct tc_action_ops act_skbedit_ops = {
ca9b0e27 AD	303	.kind = "skbedit",
ca9b0e27	304	.type = TCA_ACT_SKBEDIT,
ca9b0e27	305	.owner = THIS_MODULE,
45da1dac	306	.act = tcf_skbedit_act,
ca9b0e27	307	.dump = tcf_skbedit_dump,
ca9b0e27	308	.init = tcf_skbedit_init,
c749cdda	309	.cleanup = tcf_skbedit_cleanup,
ddf97ccd WC	310	.walk = tcf_skbedit_walker,
ddf97ccd WC	311	.lookup = tcf_skbedit_search,
a85a970a	312	.size = sizeof(struct tcf_skbedit),
ddf97ccd WC	313	};
	314
	315	static __net_init int skbedit_init_net(struct net *net)
	316	{
	317	struct tc_action_net *tn = net_generic(net, skbedit_net_id);
	318
c7e460ce	319	return tc_action_net_init(tn, &act_skbedit_ops);
ddf97ccd WC	320	}
ddf97ccd WC	321
039af9c6	322	static void __net_exit skbedit_exit_net(struct list_head *net_list)
ddf97ccd	323	{
039af9c6	324	tc_action_net_exit(net_list, skbedit_net_id);
ddf97ccd WC	325	}
	326
	327	static struct pernet_operations skbedit_net_ops = {
	328	.init = skbedit_init_net,
039af9c6	329	.exit_batch = skbedit_exit_net,
ddf97ccd WC	330	.id = &skbedit_net_id,
ddf97ccd WC	331	.size = sizeof(struct tc_action_net),
ca9b0e27 AD	332	};
	333
	334	MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>");
	335	MODULE_DESCRIPTION("SKB Editing");
	336	MODULE_LICENSE("GPL");
	337
	338	static int __init skbedit_init_module(void)
	339	{
ddf97ccd	340	return tcf_register_action(&act_skbedit_ops, &skbedit_net_ops);
ca9b0e27 AD	341	}
	342
	343	static void __exit skbedit_cleanup_module(void)
	344	{
ddf97ccd	345	tcf_unregister_action(&act_skbedit_ops, &skbedit_net_ops);
ca9b0e27 AD	346	}
	347
	348	module_init(skbedit_init_module);
	349	module_exit(skbedit_cleanup_module);