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

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * net/sched/act_skbmod.c  skb data modifier
 *
 * Copyright (c) 2016 Jamal Hadi Salim <jhs@mojatatu.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/pkt_cls.h>

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

static unsigned int skbmod_net_id;
static struct tc_action_ops act_skbmod_ops;

#define MAX_EDIT_LEN ETH_HLEN
static int tcf_skbmod_act(struct sk_buff *skb, const struct tc_action *a,
			  struct tcf_result *res)
{
	struct tcf_skbmod *d = to_skbmod(a);
	int action;
	struct tcf_skbmod_params *p;
	u64 flags;
	int err;

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

	/* XXX: if you are going to edit more fields beyond ethernet header
	 * (example when you add IP header replacement or vlan swap)
	 * then MAX_EDIT_LEN needs to change appropriately
	*/
	err = skb_ensure_writable(skb, MAX_EDIT_LEN);
	if (unlikely(err)) /* best policy is to drop on the floor */
		goto drop;

	action = READ_ONCE(d->tcf_action);
	if (unlikely(action == TC_ACT_SHOT))
		goto drop;

	p = rcu_dereference_bh(d->skbmod_p);
	flags = p->flags;
	if (flags & SKBMOD_F_DMAC)
		ether_addr_copy(eth_hdr(skb)->h_dest, p->eth_dst);
	if (flags & SKBMOD_F_SMAC)
		ether_addr_copy(eth_hdr(skb)->h_source, p->eth_src);
	if (flags & SKBMOD_F_ETYPE)
		eth_hdr(skb)->h_proto = p->eth_type;

	if (flags & SKBMOD_F_SWAPMAC) {
		u16 tmpaddr[ETH_ALEN / 2]; /* ether_addr_copy() requirement */
		/*XXX: I am sure we can come up with more efficient swapping*/
		ether_addr_copy((u8 *)tmpaddr, eth_hdr(skb)->h_dest);
		ether_addr_copy(eth_hdr(skb)->h_dest, eth_hdr(skb)->h_source);
		ether_addr_copy(eth_hdr(skb)->h_source, (u8 *)tmpaddr);
	}

	return action;

drop:
	qstats_overlimit_inc(this_cpu_ptr(d->common.cpu_qstats));
	return TC_ACT_SHOT;
}

static const struct nla_policy skbmod_policy[TCA_SKBMOD_MAX + 1] = {
	[TCA_SKBMOD_PARMS]		= { .len = sizeof(struct tc_skbmod) },
	[TCA_SKBMOD_DMAC]		= { .len = ETH_ALEN },
	[TCA_SKBMOD_SMAC]		= { .len = ETH_ALEN },
	[TCA_SKBMOD_ETYPE]		= { .type = NLA_U16 },
};

static int tcf_skbmod_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 flags,
			   struct netlink_ext_ack *extack)
{
	struct tc_action_net *tn = net_generic(net, skbmod_net_id);
	struct nlattr *tb[TCA_SKBMOD_MAX + 1];
	struct tcf_skbmod_params *p, *p_old;
	struct tcf_chain *goto_ch = NULL;
	struct tc_skbmod *parm;
	u32 lflags = 0, index;
	struct tcf_skbmod *d;
	bool exists = false;
	u8 *daddr = NULL;
	u8 *saddr = NULL;
	u16 eth_type = 0;
	int ret = 0, err;

	if (!nla)
		return -EINVAL;

	err = nla_parse_nested_deprecated(tb, TCA_SKBMOD_MAX, nla,
					  skbmod_policy, NULL);
	if (err < 0)
		return err;

	if (!tb[TCA_SKBMOD_PARMS])
		return -EINVAL;

	if (tb[TCA_SKBMOD_DMAC]) {
		daddr = nla_data(tb[TCA_SKBMOD_DMAC]);
		lflags |= SKBMOD_F_DMAC;
	}

	if (tb[TCA_SKBMOD_SMAC]) {
		saddr = nla_data(tb[TCA_SKBMOD_SMAC]);
		lflags |= SKBMOD_F_SMAC;
	}

	if (tb[TCA_SKBMOD_ETYPE]) {
		eth_type = nla_get_u16(tb[TCA_SKBMOD_ETYPE]);
		lflags |= SKBMOD_F_ETYPE;
	}

	parm = nla_data(tb[TCA_SKBMOD_PARMS]);
	index = parm->index;
	if (parm->flags & SKBMOD_F_SWAPMAC)
		lflags = SKBMOD_F_SWAPMAC;

	err = tcf_idr_check_alloc(tn, &index, a, bind);
	if (err < 0)
		return err;
	exists = err;
	if (exists && bind)
		return 0;

	if (!lflags) {
		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_skbmod_ops, bind, true, 0);
		if (ret) {
			tcf_idr_cleanup(tn, index);
			return ret;
		}

		ret = ACT_P_CREATED;
	} else 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;

	d = to_skbmod(*a);

	p = kzalloc(sizeof(struct tcf_skbmod_params), GFP_KERNEL);
	if (unlikely(!p)) {
		err = -ENOMEM;
		goto put_chain;
	}

	p->flags = lflags;

	if (ovr)
		spin_lock_bh(&d->tcf_lock);
	/* Protected by tcf_lock if overwriting existing action. */
	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
	p_old = rcu_dereference_protected(d->skbmod_p, 1);

	if (lflags & SKBMOD_F_DMAC)
		ether_addr_copy(p->eth_dst, daddr);
	if (lflags & SKBMOD_F_SMAC)
		ether_addr_copy(p->eth_src, saddr);
	if (lflags & SKBMOD_F_ETYPE)
		p->eth_type = htons(eth_type);

	rcu_assign_pointer(d->skbmod_p, p);
	if (ovr)
		spin_unlock_bh(&d->tcf_lock);

	if (p_old)
		kfree_rcu(p_old, 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 void tcf_skbmod_cleanup(struct tc_action *a)
{
	struct tcf_skbmod *d = to_skbmod(a);
	struct tcf_skbmod_params  *p;

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

static int tcf_skbmod_dump(struct sk_buff *skb, struct tc_action *a,
			   int bind, int ref)
{
	struct tcf_skbmod *d = to_skbmod(a);
	unsigned char *b = skb_tail_pointer(skb);
	struct tcf_skbmod_params  *p;
	struct tc_skbmod opt = {
		.index   = d->tcf_index,
		.refcnt  = refcount_read(&d->tcf_refcnt) - ref,
		.bindcnt = atomic_read(&d->tcf_bindcnt) - bind,
	};
	struct tcf_t t;

	spin_lock_bh(&d->tcf_lock);
	opt.action = d->tcf_action;
	p = rcu_dereference_protected(d->skbmod_p,
				      lockdep_is_held(&d->tcf_lock));
	opt.flags  = p->flags;
	if (nla_put(skb, TCA_SKBMOD_PARMS, sizeof(opt), &opt))
		goto nla_put_failure;
	if ((p->flags & SKBMOD_F_DMAC) &&
	    nla_put(skb, TCA_SKBMOD_DMAC, ETH_ALEN, p->eth_dst))
		goto nla_put_failure;
	if ((p->flags & SKBMOD_F_SMAC) &&
	    nla_put(skb, TCA_SKBMOD_SMAC, ETH_ALEN, p->eth_src))
		goto nla_put_failure;
	if ((p->flags & SKBMOD_F_ETYPE) &&
	    nla_put_u16(skb, TCA_SKBMOD_ETYPE, ntohs(p->eth_type)))
		goto nla_put_failure;

	tcf_tm_dump(&t, &d->tcf_tm);
	if (nla_put_64bit(skb, TCA_SKBMOD_TM, sizeof(t), &t, TCA_SKBMOD_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 int tcf_skbmod_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, skbmod_net_id);

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

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

	return tcf_idr_search(tn, a, index);
}

static struct tc_action_ops act_skbmod_ops = {
	.kind		=	"skbmod",
	.id		=	TCA_ACT_SKBMOD,
	.owner		=	THIS_MODULE,
	.act		=	tcf_skbmod_act,
	.dump		=	tcf_skbmod_dump,
	.init		=	tcf_skbmod_init,
	.cleanup	=	tcf_skbmod_cleanup,
	.walk		=	tcf_skbmod_walker,
	.lookup		=	tcf_skbmod_search,
	.size		=	sizeof(struct tcf_skbmod),
};

static __net_init int skbmod_init_net(struct net *net)
{
	struct tc_action_net *tn = net_generic(net, skbmod_net_id);

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

static void __net_exit skbmod_exit_net(struct list_head *net_list)
{
	tc_action_net_exit(net_list, skbmod_net_id);
}

static struct pernet_operations skbmod_net_ops = {
	.init = skbmod_init_net,
	.exit_batch = skbmod_exit_net,
	.id   = &skbmod_net_id,
	.size = sizeof(struct tc_action_net),
};

MODULE_AUTHOR("Jamal Hadi Salim, <jhs@mojatatu.com>");
MODULE_DESCRIPTION("SKB data mod-ing");
MODULE_LICENSE("GPL");

static int __init skbmod_init_module(void)
{
	return tcf_register_action(&act_skbmod_ops, &skbmod_net_ops);
}

static void __exit skbmod_cleanup_module(void)
{
	tcf_unregister_action(&act_skbmod_ops, &skbmod_net_ops);
}

module_init(skbmod_init_module);
module_exit(skbmod_cleanup_module);
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
86da71b5 JHS	2	/*
	3	* net/sched/act_skbmod.c skb data modifier
	4	*
	5	* Copyright (c) 2016 Jamal Hadi Salim <jhs@mojatatu.com>
86da71b5 JHS	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>
7c3d825d	15	#include <net/pkt_cls.h>
86da71b5 JHS	16
	17	#include <linux/tc_act/tc_skbmod.h>
	18	#include <net/tc_act/tc_skbmod.h>
	19
c7d03a00	20	static unsigned int skbmod_net_id;
86da71b5 JHS	21	static struct tc_action_ops act_skbmod_ops;
	22
	23	#define MAX_EDIT_LEN ETH_HLEN
353d2c25	24	static int tcf_skbmod_act(struct sk_buff skb, const struct tc_action a,
86da71b5 JHS	25	struct tcf_result *res)
	26	{
	27	struct tcf_skbmod *d = to_skbmod(a);
	28	int action;
	29	struct tcf_skbmod_params *p;
	30	u64 flags;
	31	int err;
	32
	33	tcf_lastuse_update(&d->tcf_tm);
	34	bstats_cpu_update(this_cpu_ptr(d->common.cpu_bstats), skb);
	35
	36	/* XXX: if you are going to edit more fields beyond ethernet header
	37	* (example when you add IP header replacement or vlan swap)
	38	* then MAX_EDIT_LEN needs to change appropriately
	39	*/
	40	err = skb_ensure_writable(skb, MAX_EDIT_LEN);
7fd4b288 PA	41	if (unlikely(err)) /* best policy is to drop on the floor */
7fd4b288 PA	42	goto drop;
86da71b5	43
86da71b5	44	action = READ_ONCE(d->tcf_action);
7fd4b288 PA	45	if (unlikely(action == TC_ACT_SHOT))
7fd4b288 PA	46	goto drop;
86da71b5	47
7fd4b288	48	p = rcu_dereference_bh(d->skbmod_p);
86da71b5 JHS	49	flags = p->flags;
	50	if (flags & SKBMOD_F_DMAC)
	51	ether_addr_copy(eth_hdr(skb)->h_dest, p->eth_dst);
	52	if (flags & SKBMOD_F_SMAC)
	53	ether_addr_copy(eth_hdr(skb)->h_source, p->eth_src);
	54	if (flags & SKBMOD_F_ETYPE)
	55	eth_hdr(skb)->h_proto = p->eth_type;
86da71b5 JHS	56
	57	if (flags & SKBMOD_F_SWAPMAC) {
	58	u16 tmpaddr[ETH_ALEN / 2]; /* ether_addr_copy() requirement */
	59	/XXX: I am sure we can come up with more efficient swapping/
	60	ether_addr_copy((u8 *)tmpaddr, eth_hdr(skb)->h_dest);
	61	ether_addr_copy(eth_hdr(skb)->h_dest, eth_hdr(skb)->h_source);
	62	ether_addr_copy(eth_hdr(skb)->h_source, (u8 *)tmpaddr);
	63	}
	64
	65	return action;
7fd4b288 PA	66
	67	drop:
	68	qstats_overlimit_inc(this_cpu_ptr(d->common.cpu_qstats));
	69	return TC_ACT_SHOT;
86da71b5 JHS	70	}
	71
	72	static const struct nla_policy skbmod_policy[TCA_SKBMOD_MAX + 1] = {
	73	[TCA_SKBMOD_PARMS] = { .len = sizeof(struct tc_skbmod) },
	74	[TCA_SKBMOD_DMAC] = { .len = ETH_ALEN },
	75	[TCA_SKBMOD_SMAC] = { .len = ETH_ALEN },
	76	[TCA_SKBMOD_ETYPE] = { .type = NLA_U16 },
	77	};
	78
	79	static int tcf_skbmod_init(struct net net, struct nlattr nla,
	80	struct nlattr est, struct tc_action *a,
789871bb	81	int ovr, int bind, bool rtnl_held,
abbb0d33	82	struct tcf_proto *tp, u32 flags,
789871bb	83	struct netlink_ext_ack *extack)
86da71b5 JHS	84	{
	85	struct tc_action_net *tn = net_generic(net, skbmod_net_id);
	86	struct nlattr *tb[TCA_SKBMOD_MAX + 1];
	87	struct tcf_skbmod_params p, p_old;
7c3d825d	88	struct tcf_chain *goto_ch = NULL;
86da71b5	89	struct tc_skbmod *parm;
7be8ef2c	90	u32 lflags = 0, index;
86da71b5 JHS	91	struct tcf_skbmod *d;
	92	bool exists = false;
	93	u8 *daddr = NULL;
	94	u8 *saddr = NULL;
	95	u16 eth_type = 0;
86da71b5 JHS	96	int ret = 0, err;
	97
	98	if (!nla)
	99	return -EINVAL;
	100
8cb08174 JB	101	err = nla_parse_nested_deprecated(tb, TCA_SKBMOD_MAX, nla,
8cb08174 JB	102	skbmod_policy, NULL);
86da71b5 JHS	103	if (err < 0)
	104	return err;
	105
	106	if (!tb[TCA_SKBMOD_PARMS])
	107	return -EINVAL;
	108
	109	if (tb[TCA_SKBMOD_DMAC]) {
	110	daddr = nla_data(tb[TCA_SKBMOD_DMAC]);
	111	lflags \|= SKBMOD_F_DMAC;
	112	}
	113
	114	if (tb[TCA_SKBMOD_SMAC]) {
	115	saddr = nla_data(tb[TCA_SKBMOD_SMAC]);
	116	lflags \|= SKBMOD_F_SMAC;
	117	}
	118
	119	if (tb[TCA_SKBMOD_ETYPE]) {
	120	eth_type = nla_get_u16(tb[TCA_SKBMOD_ETYPE]);
	121	lflags \|= SKBMOD_F_ETYPE;
	122	}
	123
	124	parm = nla_data(tb[TCA_SKBMOD_PARMS]);
7be8ef2c	125	index = parm->index;
86da71b5 JHS	126	if (parm->flags & SKBMOD_F_SWAPMAC)
	127	lflags = SKBMOD_F_SWAPMAC;
	128
7be8ef2c	129	err = tcf_idr_check_alloc(tn, &index, a, bind);
0190c1d4 VB	130	if (err < 0)
	131	return err;
	132	exists = err;
86da71b5 JHS	133	if (exists && bind)
	134	return 0;
	135
a52956df RM	136	if (!lflags) {
	137	if (exists)
	138	tcf_idr_release(*a, bind);
0190c1d4	139	else
7be8ef2c	140	tcf_idr_cleanup(tn, index);
86da71b5	141	return -EINVAL;
a52956df	142	}
86da71b5 JHS	143
86da71b5 JHS	144	if (!exists) {
7be8ef2c	145	ret = tcf_idr_create(tn, index, est, a,
e3822678	146	&act_skbmod_ops, bind, true, 0);
0190c1d4	147	if (ret) {
7be8ef2c	148	tcf_idr_cleanup(tn, index);
86da71b5	149	return ret;
0190c1d4	150	}
86da71b5 JHS	151
86da71b5 JHS	152	ret = ACT_P_CREATED;
4e8ddd7f	153	} else if (!ovr) {
65a206c0	154	tcf_idr_release(*a, bind);
4e8ddd7f	155	return -EEXIST;
86da71b5	156	}
7c3d825d DC	157	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
	158	if (err < 0)
	159	goto release_idr;
86da71b5 JHS	160
	161	d = to_skbmod(*a);
	162
86da71b5 JHS	163	p = kzalloc(sizeof(struct tcf_skbmod_params), GFP_KERNEL);
86da71b5 JHS	164	if (unlikely(!p)) {
7c3d825d DC	165	err = -ENOMEM;
7c3d825d DC	166	goto put_chain;
86da71b5 JHS	167	}
	168
	169	p->flags = lflags;
86da71b5	170
86da71b5 JHS	171	if (ovr)
86da71b5 JHS	172	spin_lock_bh(&d->tcf_lock);
c8814552	173	/* Protected by tcf_lock if overwriting existing action. */
7c3d825d	174	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
c8814552	175	p_old = rcu_dereference_protected(d->skbmod_p, 1);
86da71b5 JHS	176
	177	if (lflags & SKBMOD_F_DMAC)
	178	ether_addr_copy(p->eth_dst, daddr);
	179	if (lflags & SKBMOD_F_SMAC)
	180	ether_addr_copy(p->eth_src, saddr);
	181	if (lflags & SKBMOD_F_ETYPE)
	182	p->eth_type = htons(eth_type);
	183
	184	rcu_assign_pointer(d->skbmod_p, p);
	185	if (ovr)
	186	spin_unlock_bh(&d->tcf_lock);
	187
	188	if (p_old)
	189	kfree_rcu(p_old, rcu);
7c3d825d DC	190	if (goto_ch)
7c3d825d DC	191	tcf_chain_put_by_act(goto_ch);
86da71b5 JHS	192
86da71b5 JHS	193	if (ret == ACT_P_CREATED)
65a206c0	194	tcf_idr_insert(tn, *a);
86da71b5	195	return ret;
7c3d825d DC	196	put_chain:
	197	if (goto_ch)
	198	tcf_chain_put_by_act(goto_ch);
	199	release_idr:
	200	tcf_idr_release(*a, bind);
	201	return err;
86da71b5 JHS	202	}
86da71b5 JHS	203
9a63b255	204	static void tcf_skbmod_cleanup(struct tc_action *a)
86da71b5 JHS	205	{
	206	struct tcf_skbmod *d = to_skbmod(a);
	207	struct tcf_skbmod_params *p;
	208
	209	p = rcu_dereference_protected(d->skbmod_p, 1);
2d433610 DC	210	if (p)
2d433610 DC	211	kfree_rcu(p, rcu);
86da71b5 JHS	212	}
	213
	214	static int tcf_skbmod_dump(struct sk_buff skb, struct tc_action a,
	215	int bind, int ref)
	216	{
	217	struct tcf_skbmod *d = to_skbmod(a);
	218	unsigned char *b = skb_tail_pointer(skb);
c8814552	219	struct tcf_skbmod_params *p;
86da71b5 JHS	220	struct tc_skbmod opt = {
86da71b5 JHS	221	.index = d->tcf_index,
036bb443 VB	222	.refcnt = refcount_read(&d->tcf_refcnt) - ref,
036bb443 VB	223	.bindcnt = atomic_read(&d->tcf_bindcnt) - bind,
86da71b5 JHS	224	};
	225	struct tcf_t t;
	226
c8814552 VB	227	spin_lock_bh(&d->tcf_lock);
	228	opt.action = d->tcf_action;
	229	p = rcu_dereference_protected(d->skbmod_p,
	230	lockdep_is_held(&d->tcf_lock));
86da71b5 JHS	231	opt.flags = p->flags;
	232	if (nla_put(skb, TCA_SKBMOD_PARMS, sizeof(opt), &opt))
	233	goto nla_put_failure;
	234	if ((p->flags & SKBMOD_F_DMAC) &&
	235	nla_put(skb, TCA_SKBMOD_DMAC, ETH_ALEN, p->eth_dst))
	236	goto nla_put_failure;
	237	if ((p->flags & SKBMOD_F_SMAC) &&
	238	nla_put(skb, TCA_SKBMOD_SMAC, ETH_ALEN, p->eth_src))
	239	goto nla_put_failure;
	240	if ((p->flags & SKBMOD_F_ETYPE) &&
	241	nla_put_u16(skb, TCA_SKBMOD_ETYPE, ntohs(p->eth_type)))
	242	goto nla_put_failure;
	243
	244	tcf_tm_dump(&t, &d->tcf_tm);
	245	if (nla_put_64bit(skb, TCA_SKBMOD_TM, sizeof(t), &t, TCA_SKBMOD_PAD))
	246	goto nla_put_failure;
	247
c8814552	248	spin_unlock_bh(&d->tcf_lock);
86da71b5 JHS	249	return skb->len;
86da71b5 JHS	250	nla_put_failure:
c8814552	251	spin_unlock_bh(&d->tcf_lock);
86da71b5 JHS	252	nlmsg_trim(skb, b);
	253	return -1;
	254	}
	255
	256	static int tcf_skbmod_walker(struct net net, struct sk_buff skb,
	257	struct netlink_callback *cb, int type,
41780105 AA	258	const struct tc_action_ops *ops,
41780105 AA	259	struct netlink_ext_ack *extack)
86da71b5 JHS	260	{
	261	struct tc_action_net *tn = net_generic(net, skbmod_net_id);
	262
b3620145	263	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
86da71b5 JHS	264	}
86da71b5 JHS	265
f061b48c	266	static int tcf_skbmod_search(struct net net, struct tc_action *a, u32 index)
86da71b5 JHS	267	{
	268	struct tc_action_net *tn = net_generic(net, skbmod_net_id);
	269
65a206c0	270	return tcf_idr_search(tn, a, index);
86da71b5 JHS	271	}
	272
	273	static struct tc_action_ops act_skbmod_ops = {
	274	.kind = "skbmod",
eddd2cf1	275	.id = TCA_ACT_SKBMOD,
86da71b5	276	.owner = THIS_MODULE,
353d2c25	277	.act = tcf_skbmod_act,
86da71b5 JHS	278	.dump = tcf_skbmod_dump,
	279	.init = tcf_skbmod_init,
	280	.cleanup = tcf_skbmod_cleanup,
	281	.walk = tcf_skbmod_walker,
	282	.lookup = tcf_skbmod_search,
	283	.size = sizeof(struct tcf_skbmod),
	284	};
	285
	286	static __net_init int skbmod_init_net(struct net *net)
	287	{
	288	struct tc_action_net *tn = net_generic(net, skbmod_net_id);
	289
981471bd	290	return tc_action_net_init(net, tn, &act_skbmod_ops);
86da71b5 JHS	291	}
86da71b5 JHS	292
039af9c6	293	static void __net_exit skbmod_exit_net(struct list_head *net_list)
86da71b5	294	{
039af9c6	295	tc_action_net_exit(net_list, skbmod_net_id);
86da71b5 JHS	296	}
	297
	298	static struct pernet_operations skbmod_net_ops = {
	299	.init = skbmod_init_net,
039af9c6	300	.exit_batch = skbmod_exit_net,
86da71b5 JHS	301	.id = &skbmod_net_id,
	302	.size = sizeof(struct tc_action_net),
	303	};
	304
	305	MODULE_AUTHOR("Jamal Hadi Salim, <jhs@mojatatu.com>");
	306	MODULE_DESCRIPTION("SKB data mod-ing");
	307	MODULE_LICENSE("GPL");
	308
	309	static int __init skbmod_init_module(void)
	310	{
	311	return tcf_register_action(&act_skbmod_ops, &skbmod_net_ops);
	312	}
	313
	314	static void __exit skbmod_cleanup_module(void)
	315	{
	316	tcf_unregister_action(&act_skbmod_ops, &skbmod_net_ops);
	317	}
	318
	319	module_init(skbmod_init_module);
	320	module_exit(skbmod_cleanup_module);