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

/*
 * Copyright (c) 2014 Jiri Pirko <jiri@resnulli.us>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <linux/if_vlan.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>

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

#define VLAN_TAB_MASK     15

static int vlan_net_id;

static int tcf_vlan(struct sk_buff *skb, const struct tc_action *a,
		    struct tcf_result *res)
{
	struct tcf_vlan *v = a->priv;
	int action;
	int err;

	spin_lock(&v->tcf_lock);
	v->tcf_tm.lastuse = jiffies;
	bstats_update(&v->tcf_bstats, skb);
	action = v->tcf_action;

	switch (v->tcfv_action) {
	case TCA_VLAN_ACT_POP:
		err = skb_vlan_pop(skb);
		if (err)
			goto drop;
		break;
	case TCA_VLAN_ACT_PUSH:
		err = skb_vlan_push(skb, v->tcfv_push_proto, v->tcfv_push_vid);
		if (err)
			goto drop;
		break;
	default:
		BUG();
	}

	goto unlock;

drop:
	action = TC_ACT_SHOT;
	v->tcf_qstats.drops++;
unlock:
	spin_unlock(&v->tcf_lock);
	return action;
}

static const struct nla_policy vlan_policy[TCA_VLAN_MAX + 1] = {
	[TCA_VLAN_PARMS]		= { .len = sizeof(struct tc_vlan) },
	[TCA_VLAN_PUSH_VLAN_ID]		= { .type = NLA_U16 },
	[TCA_VLAN_PUSH_VLAN_PROTOCOL]	= { .type = NLA_U16 },
};

static int tcf_vlan_init(struct net *net, struct nlattr *nla,
			 struct nlattr *est, struct tc_action *a,
			 int ovr, int bind)
{
	struct tc_action_net *tn = net_generic(net, vlan_net_id);
	struct nlattr *tb[TCA_VLAN_MAX + 1];
	struct tc_vlan *parm;
	struct tcf_vlan *v;
	int action;
	__be16 push_vid = 0;
	__be16 push_proto = 0;
	int ret = 0, exists = 0;
	int err;

	if (!nla)
		return -EINVAL;

	err = nla_parse_nested(tb, TCA_VLAN_MAX, nla, vlan_policy);
	if (err < 0)
		return err;

	if (!tb[TCA_VLAN_PARMS])
		return -EINVAL;
	parm = nla_data(tb[TCA_VLAN_PARMS]);
	exists = tcf_hash_check(tn, parm->index, a, bind);
	if (exists && bind)
		return 0;

	switch (parm->v_action) {
	case TCA_VLAN_ACT_POP:
		break;
	case TCA_VLAN_ACT_PUSH:
		if (!tb[TCA_VLAN_PUSH_VLAN_ID]) {
			if (exists)
				tcf_hash_release(a, bind);
			return -EINVAL;
		}
		push_vid = nla_get_u16(tb[TCA_VLAN_PUSH_VLAN_ID]);
		if (push_vid >= VLAN_VID_MASK) {
			if (exists)
				tcf_hash_release(a, bind);
			return -ERANGE;
		}

		if (tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]) {
			push_proto = nla_get_be16(tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]);
			switch (push_proto) {
			case htons(ETH_P_8021Q):
			case htons(ETH_P_8021AD):
				break;
			default:
				return -EPROTONOSUPPORT;
			}
		} else {
			push_proto = htons(ETH_P_8021Q);
		}
		break;
	default:
		if (exists)
			tcf_hash_release(a, bind);
		return -EINVAL;
	}
	action = parm->v_action;

	if (!exists) {
		ret = tcf_hash_create(tn, parm->index, est, a,
				      sizeof(*v), bind, false);
		if (ret)
			return ret;

		ret = ACT_P_CREATED;
	} else {
		tcf_hash_release(a, bind);
		if (!ovr)
			return -EEXIST;
	}

	v = to_vlan(a);

	spin_lock_bh(&v->tcf_lock);

	v->tcfv_action = action;
	v->tcfv_push_vid = push_vid;
	v->tcfv_push_proto = push_proto;

	v->tcf_action = parm->action;

	spin_unlock_bh(&v->tcf_lock);

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

static int tcf_vlan_dump(struct sk_buff *skb, struct tc_action *a,
			 int bind, int ref)
{
	unsigned char *b = skb_tail_pointer(skb);
	struct tcf_vlan *v = a->priv;
	struct tc_vlan opt = {
		.index    = v->tcf_index,
		.refcnt   = v->tcf_refcnt - ref,
		.bindcnt  = v->tcf_bindcnt - bind,
		.action   = v->tcf_action,
		.v_action = v->tcfv_action,
	};
	struct tcf_t t;

	if (nla_put(skb, TCA_VLAN_PARMS, sizeof(opt), &opt))
		goto nla_put_failure;

	if (v->tcfv_action == TCA_VLAN_ACT_PUSH &&
	    (nla_put_u16(skb, TCA_VLAN_PUSH_VLAN_ID, v->tcfv_push_vid) ||
	     nla_put_be16(skb, TCA_VLAN_PUSH_VLAN_PROTOCOL, v->tcfv_push_proto)))
		goto nla_put_failure;

	t.install = jiffies_to_clock_t(jiffies - v->tcf_tm.install);
	t.lastuse = jiffies_to_clock_t(jiffies - v->tcf_tm.lastuse);
	t.expires = jiffies_to_clock_t(v->tcf_tm.expires);
	if (nla_put(skb, TCA_VLAN_TM, sizeof(t), &t))
		goto nla_put_failure;
	return skb->len;

nla_put_failure:
	nlmsg_trim(skb, b);
	return -1;
}

static int tcf_vlan_walker(struct net *net, struct sk_buff *skb,
			   struct netlink_callback *cb, int type,
			   struct tc_action *a)
{
	struct tc_action_net *tn = net_generic(net, vlan_net_id);

	return tcf_generic_walker(tn, skb, cb, type, a);
}

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

	return tcf_hash_search(tn, a, index);
}

static struct tc_action_ops act_vlan_ops = {
	.kind		=	"vlan",
	.type		=	TCA_ACT_VLAN,
	.owner		=	THIS_MODULE,
	.act		=	tcf_vlan,
	.dump		=	tcf_vlan_dump,
	.init		=	tcf_vlan_init,
	.walk		=	tcf_vlan_walker,
	.lookup		=	tcf_vlan_search,
};

static __net_init int vlan_init_net(struct net *net)
{
	struct tc_action_net *tn = net_generic(net, vlan_net_id);

	return tc_action_net_init(tn, &act_vlan_ops, VLAN_TAB_MASK);
}

static void __net_exit vlan_exit_net(struct net *net)
{
	struct tc_action_net *tn = net_generic(net, vlan_net_id);

	tc_action_net_exit(tn);
}

static struct pernet_operations vlan_net_ops = {
	.init = vlan_init_net,
	.exit = vlan_exit_net,
	.id   = &vlan_net_id,
	.size = sizeof(struct tc_action_net),
};

static int __init vlan_init_module(void)
{
	return tcf_register_action(&act_vlan_ops, &vlan_net_ops);
}

static void __exit vlan_cleanup_module(void)
{
	tcf_unregister_action(&act_vlan_ops, &vlan_net_ops);
}

module_init(vlan_init_module);
module_exit(vlan_cleanup_module);

MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
MODULE_DESCRIPTION("vlan manipulation actions");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
c7e2b968 JP	1	/*
	2	* Copyright (c) 2014 Jiri Pirko <jiri@resnulli.us>
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation; either version 2 of the License, or
	7	* (at your option) any later version.
	8	*/
	9
	10	#include <linux/module.h>
	11	#include <linux/init.h>
	12	#include <linux/kernel.h>
	13	#include <linux/skbuff.h>
	14	#include <linux/rtnetlink.h>
	15	#include <linux/if_vlan.h>
	16	#include <net/netlink.h>
	17	#include <net/pkt_sched.h>
	18
	19	#include <linux/tc_act/tc_vlan.h>
	20	#include <net/tc_act/tc_vlan.h>
	21
	22	#define VLAN_TAB_MASK 15
	23
ddf97ccd WC	24	static int vlan_net_id;
ddf97ccd WC	25
c7e2b968 JP	26	static int tcf_vlan(struct sk_buff skb, const struct tc_action a,
	27	struct tcf_result *res)
	28	{
	29	struct tcf_vlan *v = a->priv;
	30	int action;
	31	int err;
	32
	33	spin_lock(&v->tcf_lock);
	34	v->tcf_tm.lastuse = jiffies;
	35	bstats_update(&v->tcf_bstats, skb);
	36	action = v->tcf_action;
	37
	38	switch (v->tcfv_action) {
	39	case TCA_VLAN_ACT_POP:
	40	err = skb_vlan_pop(skb);
	41	if (err)
	42	goto drop;
	43	break;
	44	case TCA_VLAN_ACT_PUSH:
	45	err = skb_vlan_push(skb, v->tcfv_push_proto, v->tcfv_push_vid);
	46	if (err)
	47	goto drop;
	48	break;
	49	default:
	50	BUG();
	51	}
	52
	53	goto unlock;
	54
	55	drop:
	56	action = TC_ACT_SHOT;
	57	v->tcf_qstats.drops++;
	58	unlock:
	59	spin_unlock(&v->tcf_lock);
	60	return action;
	61	}
	62
	63	static const struct nla_policy vlan_policy[TCA_VLAN_MAX + 1] = {
	64	[TCA_VLAN_PARMS] = { .len = sizeof(struct tc_vlan) },
	65	[TCA_VLAN_PUSH_VLAN_ID] = { .type = NLA_U16 },
	66	[TCA_VLAN_PUSH_VLAN_PROTOCOL] = { .type = NLA_U16 },
	67	};
	68
	69	static int tcf_vlan_init(struct net net, struct nlattr nla,
	70	struct nlattr est, struct tc_action a,
	71	int ovr, int bind)
	72	{
ddf97ccd	73	struct tc_action_net *tn = net_generic(net, vlan_net_id);
c7e2b968 JP	74	struct nlattr *tb[TCA_VLAN_MAX + 1];
	75	struct tc_vlan *parm;
	76	struct tcf_vlan *v;
	77	int action;
	78	__be16 push_vid = 0;
	79	__be16 push_proto = 0;
5026c9b1	80	int ret = 0, exists = 0;
c7e2b968 JP	81	int err;
	82
	83	if (!nla)
	84	return -EINVAL;
	85
	86	err = nla_parse_nested(tb, TCA_VLAN_MAX, nla, vlan_policy);
	87	if (err < 0)
	88	return err;
	89
	90	if (!tb[TCA_VLAN_PARMS])
	91	return -EINVAL;
	92	parm = nla_data(tb[TCA_VLAN_PARMS]);
5026c9b1 JHS	93	exists = tcf_hash_check(tn, parm->index, a, bind);
	94	if (exists && bind)
	95	return 0;
	96
c7e2b968 JP	97	switch (parm->v_action) {
	98	case TCA_VLAN_ACT_POP:
	99	break;
	100	case TCA_VLAN_ACT_PUSH:
5026c9b1 JHS	101	if (!tb[TCA_VLAN_PUSH_VLAN_ID]) {
	102	if (exists)
	103	tcf_hash_release(a, bind);
c7e2b968	104	return -EINVAL;
5026c9b1	105	}
c7e2b968	106	push_vid = nla_get_u16(tb[TCA_VLAN_PUSH_VLAN_ID]);
5026c9b1 JHS	107	if (push_vid >= VLAN_VID_MASK) {
	108	if (exists)
	109	tcf_hash_release(a, bind);
c7e2b968	110	return -ERANGE;
5026c9b1	111	}
c7e2b968 JP	112
	113	if (tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]) {
	114	push_proto = nla_get_be16(tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]);
	115	switch (push_proto) {
	116	case htons(ETH_P_8021Q):
	117	case htons(ETH_P_8021AD):
	118	break;
	119	default:
	120	return -EPROTONOSUPPORT;
	121	}
	122	} else {
	123	push_proto = htons(ETH_P_8021Q);
	124	}
	125	break;
	126	default:
5026c9b1 JHS	127	if (exists)
5026c9b1 JHS	128	tcf_hash_release(a, bind);
c7e2b968 JP	129	return -EINVAL;
	130	}
	131	action = parm->v_action;
	132
5026c9b1	133	if (!exists) {
ddf97ccd WC	134	ret = tcf_hash_create(tn, parm->index, est, a,
ddf97ccd WC	135	sizeof(*v), bind, false);
c7e2b968 JP	136	if (ret)
	137	return ret;
	138
	139	ret = ACT_P_CREATED;
	140	} else {
c7e2b968 JP	141	tcf_hash_release(a, bind);
	142	if (!ovr)
	143	return -EEXIST;
	144	}
	145
	146	v = to_vlan(a);
	147
	148	spin_lock_bh(&v->tcf_lock);
	149
	150	v->tcfv_action = action;
	151	v->tcfv_push_vid = push_vid;
	152	v->tcfv_push_proto = push_proto;
	153
	154	v->tcf_action = parm->action;
	155
	156	spin_unlock_bh(&v->tcf_lock);
	157
	158	if (ret == ACT_P_CREATED)
ddf97ccd	159	tcf_hash_insert(tn, a);
c7e2b968 JP	160	return ret;
	161	}
	162
	163	static int tcf_vlan_dump(struct sk_buff skb, struct tc_action a,
	164	int bind, int ref)
	165	{
	166	unsigned char *b = skb_tail_pointer(skb);
	167	struct tcf_vlan *v = a->priv;
	168	struct tc_vlan opt = {
	169	.index = v->tcf_index,
	170	.refcnt = v->tcf_refcnt - ref,
	171	.bindcnt = v->tcf_bindcnt - bind,
	172	.action = v->tcf_action,
	173	.v_action = v->tcfv_action,
	174	};
	175	struct tcf_t t;
	176
	177	if (nla_put(skb, TCA_VLAN_PARMS, sizeof(opt), &opt))
	178	goto nla_put_failure;
	179
	180	if (v->tcfv_action == TCA_VLAN_ACT_PUSH &&
	181	(nla_put_u16(skb, TCA_VLAN_PUSH_VLAN_ID, v->tcfv_push_vid) \|\|
	182	nla_put_be16(skb, TCA_VLAN_PUSH_VLAN_PROTOCOL, v->tcfv_push_proto)))
	183	goto nla_put_failure;
	184
	185	t.install = jiffies_to_clock_t(jiffies - v->tcf_tm.install);
	186	t.lastuse = jiffies_to_clock_t(jiffies - v->tcf_tm.lastuse);
	187	t.expires = jiffies_to_clock_t(v->tcf_tm.expires);
	188	if (nla_put(skb, TCA_VLAN_TM, sizeof(t), &t))
	189	goto nla_put_failure;
	190	return skb->len;
	191
	192	nla_put_failure:
	193	nlmsg_trim(skb, b);
	194	return -1;
	195	}
	196
ddf97ccd WC	197	static int tcf_vlan_walker(struct net net, struct sk_buff skb,
	198	struct netlink_callback *cb, int type,
	199	struct tc_action *a)
	200	{
	201	struct tc_action_net *tn = net_generic(net, vlan_net_id);
	202
	203	return tcf_generic_walker(tn, skb, cb, type, a);
	204	}
	205
	206	static int tcf_vlan_search(struct net net, struct tc_action a, u32 index)
	207	{
	208	struct tc_action_net *tn = net_generic(net, vlan_net_id);
	209
	210	return tcf_hash_search(tn, a, index);
	211	}
	212
c7e2b968 JP	213	static struct tc_action_ops act_vlan_ops = {
	214	.kind = "vlan",
	215	.type = TCA_ACT_VLAN,
	216	.owner = THIS_MODULE,
	217	.act = tcf_vlan,
	218	.dump = tcf_vlan_dump,
	219	.init = tcf_vlan_init,
ddf97ccd WC	220	.walk = tcf_vlan_walker,
	221	.lookup = tcf_vlan_search,
	222	};
	223
	224	static __net_init int vlan_init_net(struct net *net)
	225	{
	226	struct tc_action_net *tn = net_generic(net, vlan_net_id);
	227
	228	return tc_action_net_init(tn, &act_vlan_ops, VLAN_TAB_MASK);
	229	}
	230
	231	static void __net_exit vlan_exit_net(struct net *net)
	232	{
	233	struct tc_action_net *tn = net_generic(net, vlan_net_id);
	234
	235	tc_action_net_exit(tn);
	236	}
	237
	238	static struct pernet_operations vlan_net_ops = {
	239	.init = vlan_init_net,
	240	.exit = vlan_exit_net,
	241	.id = &vlan_net_id,
	242	.size = sizeof(struct tc_action_net),
c7e2b968 JP	243	};
	244
	245	static int __init vlan_init_module(void)
	246	{
ddf97ccd	247	return tcf_register_action(&act_vlan_ops, &vlan_net_ops);
c7e2b968 JP	248	}
	249
	250	static void __exit vlan_cleanup_module(void)
	251	{
ddf97ccd	252	tcf_unregister_action(&act_vlan_ops, &vlan_net_ops);
c7e2b968 JP	253	}
	254
	255	module_init(vlan_init_module);
	256	module_exit(vlan_cleanup_module);
	257
	258	MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
	259	MODULE_DESCRIPTION("vlan manipulation actions");
	260	MODULE_LICENSE("GPL v2");