[deliverable/linux.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 struct tc_action_ops act_vlan_ops;

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

	spin_lock(&v->tcf_lock);
	tcf_lastuse_update(&v->tcf_tm);
	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 |
				    (v->tcfv_push_prio << VLAN_PRIO_SHIFT));
		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 },
	[TCA_VLAN_PUSH_VLAN_PRIORITY]	= { .type = NLA_U8 },
};

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;
	u8 push_prio = 0;
	bool exists = false;
	int ret = 0, 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);
		}

		if (tb[TCA_VLAN_PUSH_VLAN_PRIORITY])
			push_prio = nla_get_u8(tb[TCA_VLAN_PUSH_VLAN_PRIORITY]);
		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,
				      &act_vlan_ops, 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_prio = push_prio;
	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 = to_vlan(a);
	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) ||
	     (nla_put_u8(skb, TCA_VLAN_PUSH_VLAN_PRIORITY,
					      v->tcfv_push_prio))))
		goto nla_put_failure;

	tcf_tm_dump(&t, &v->tcf_tm);
	if (nla_put_64bit(skb, TCA_VLAN_TM, sizeof(t), &t, TCA_VLAN_PAD))
		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,
			   const struct tc_action_ops *ops)
{
	struct tc_action_net *tn = net_generic(net, vlan_net_id);

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

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,
	.size		=	sizeof(struct tcf_vlan),
};

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	24	static int vlan_net_id;
a85a970a	25	static struct tc_action_ops act_vlan_ops;
ddf97ccd	26
c7e2b968 JP	27	static int tcf_vlan(struct sk_buff skb, const struct tc_action a,
	28	struct tcf_result *res)
	29	{
a85a970a	30	struct tcf_vlan *v = to_vlan(a);
c7e2b968 JP	31	int action;
	32	int err;
	33
	34	spin_lock(&v->tcf_lock);
9c4a4e48	35	tcf_lastuse_update(&v->tcf_tm);
c7e2b968 JP	36	bstats_update(&v->tcf_bstats, skb);
	37	action = v->tcf_action;
	38
	39	switch (v->tcfv_action) {
	40	case TCA_VLAN_ACT_POP:
	41	err = skb_vlan_pop(skb);
	42	if (err)
	43	goto drop;
	44	break;
	45	case TCA_VLAN_ACT_PUSH:
956af371 HHZ	46	err = skb_vlan_push(skb, v->tcfv_push_proto, v->tcfv_push_vid \|
956af371 HHZ	47	(v->tcfv_push_prio << VLAN_PRIO_SHIFT));
c7e2b968 JP	48	if (err)
	49	goto drop;
	50	break;
	51	default:
	52	BUG();
	53	}
	54
	55	goto unlock;
	56
	57	drop:
	58	action = TC_ACT_SHOT;
	59	v->tcf_qstats.drops++;
	60	unlock:
	61	spin_unlock(&v->tcf_lock);
	62	return action;
	63	}
	64
	65	static const struct nla_policy vlan_policy[TCA_VLAN_MAX + 1] = {
	66	[TCA_VLAN_PARMS] = { .len = sizeof(struct tc_vlan) },
	67	[TCA_VLAN_PUSH_VLAN_ID] = { .type = NLA_U16 },
	68	[TCA_VLAN_PUSH_VLAN_PROTOCOL] = { .type = NLA_U16 },
956af371	69	[TCA_VLAN_PUSH_VLAN_PRIORITY] = { .type = NLA_U8 },
c7e2b968 JP	70	};
	71
	72	static int tcf_vlan_init(struct net net, struct nlattr nla,
a85a970a	73	struct nlattr est, struct tc_action *a,
c7e2b968 JP	74	int ovr, int bind)
c7e2b968 JP	75	{
ddf97ccd	76	struct tc_action_net *tn = net_generic(net, vlan_net_id);
c7e2b968 JP	77	struct nlattr *tb[TCA_VLAN_MAX + 1];
	78	struct tc_vlan *parm;
	79	struct tcf_vlan *v;
	80	int action;
	81	__be16 push_vid = 0;
	82	__be16 push_proto = 0;
956af371	83	u8 push_prio = 0;
b2313077 WC	84	bool exists = false;
b2313077 WC	85	int ret = 0, err;
c7e2b968 JP	86
	87	if (!nla)
	88	return -EINVAL;
	89
	90	err = nla_parse_nested(tb, TCA_VLAN_MAX, nla, vlan_policy);
	91	if (err < 0)
	92	return err;
	93
	94	if (!tb[TCA_VLAN_PARMS])
	95	return -EINVAL;
	96	parm = nla_data(tb[TCA_VLAN_PARMS]);
5026c9b1 JHS	97	exists = tcf_hash_check(tn, parm->index, a, bind);
	98	if (exists && bind)
	99	return 0;
	100
c7e2b968 JP	101	switch (parm->v_action) {
	102	case TCA_VLAN_ACT_POP:
	103	break;
	104	case TCA_VLAN_ACT_PUSH:
5026c9b1 JHS	105	if (!tb[TCA_VLAN_PUSH_VLAN_ID]) {
5026c9b1 JHS	106	if (exists)
a85a970a	107	tcf_hash_release(*a, bind);
c7e2b968	108	return -EINVAL;
5026c9b1	109	}
c7e2b968	110	push_vid = nla_get_u16(tb[TCA_VLAN_PUSH_VLAN_ID]);
5026c9b1 JHS	111	if (push_vid >= VLAN_VID_MASK) {
5026c9b1 JHS	112	if (exists)
a85a970a	113	tcf_hash_release(*a, bind);
c7e2b968	114	return -ERANGE;
5026c9b1	115	}
c7e2b968 JP	116
	117	if (tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]) {
	118	push_proto = nla_get_be16(tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]);
	119	switch (push_proto) {
	120	case htons(ETH_P_8021Q):
	121	case htons(ETH_P_8021AD):
	122	break;
	123	default:
	124	return -EPROTONOSUPPORT;
	125	}
	126	} else {
	127	push_proto = htons(ETH_P_8021Q);
	128	}
956af371 HHZ	129
	130	if (tb[TCA_VLAN_PUSH_VLAN_PRIORITY])
	131	push_prio = nla_get_u8(tb[TCA_VLAN_PUSH_VLAN_PRIORITY]);
c7e2b968 JP	132	break;
c7e2b968 JP	133	default:
5026c9b1	134	if (exists)
a85a970a	135	tcf_hash_release(*a, bind);
c7e2b968 JP	136	return -EINVAL;
	137	}
	138	action = parm->v_action;
	139
5026c9b1	140	if (!exists) {
ddf97ccd	141	ret = tcf_hash_create(tn, parm->index, est, a,
a85a970a	142	&act_vlan_ops, bind, false);
c7e2b968 JP	143	if (ret)
	144	return ret;
	145
	146	ret = ACT_P_CREATED;
	147	} else {
a85a970a	148	tcf_hash_release(*a, bind);
c7e2b968 JP	149	if (!ovr)
	150	return -EEXIST;
	151	}
	152
a85a970a	153	v = to_vlan(*a);
c7e2b968 JP	154
	155	spin_lock_bh(&v->tcf_lock);
	156
	157	v->tcfv_action = action;
	158	v->tcfv_push_vid = push_vid;
956af371	159	v->tcfv_push_prio = push_prio;
c7e2b968 JP	160	v->tcfv_push_proto = push_proto;
	161
	162	v->tcf_action = parm->action;
	163
	164	spin_unlock_bh(&v->tcf_lock);
	165
	166	if (ret == ACT_P_CREATED)
a85a970a	167	tcf_hash_insert(tn, *a);
c7e2b968 JP	168	return ret;
	169	}
	170
	171	static int tcf_vlan_dump(struct sk_buff skb, struct tc_action a,
	172	int bind, int ref)
	173	{
	174	unsigned char *b = skb_tail_pointer(skb);
a85a970a	175	struct tcf_vlan *v = to_vlan(a);
c7e2b968 JP	176	struct tc_vlan opt = {
	177	.index = v->tcf_index,
	178	.refcnt = v->tcf_refcnt - ref,
	179	.bindcnt = v->tcf_bindcnt - bind,
	180	.action = v->tcf_action,
	181	.v_action = v->tcfv_action,
	182	};
	183	struct tcf_t t;
	184
	185	if (nla_put(skb, TCA_VLAN_PARMS, sizeof(opt), &opt))
	186	goto nla_put_failure;
	187
	188	if (v->tcfv_action == TCA_VLAN_ACT_PUSH &&
	189	(nla_put_u16(skb, TCA_VLAN_PUSH_VLAN_ID, v->tcfv_push_vid) \|\|
0b0f43fe	190	nla_put_be16(skb, TCA_VLAN_PUSH_VLAN_PROTOCOL,
956af371 HHZ	191	v->tcfv_push_proto) \|\|
	192	(nla_put_u8(skb, TCA_VLAN_PUSH_VLAN_PRIORITY,
	193	v->tcfv_push_prio))))
c7e2b968 JP	194	goto nla_put_failure;
c7e2b968 JP	195
48d8ee16	196	tcf_tm_dump(&t, &v->tcf_tm);
9854518e	197	if (nla_put_64bit(skb, TCA_VLAN_TM, sizeof(t), &t, TCA_VLAN_PAD))
c7e2b968 JP	198	goto nla_put_failure;
	199	return skb->len;
	200
	201	nla_put_failure:
	202	nlmsg_trim(skb, b);
	203	return -1;
	204	}
	205
ddf97ccd WC	206	static int tcf_vlan_walker(struct net net, struct sk_buff skb,
ddf97ccd WC	207	struct netlink_callback *cb, int type,
a85a970a	208	const struct tc_action_ops *ops)
ddf97ccd WC	209	{
	210	struct tc_action_net *tn = net_generic(net, vlan_net_id);
	211
a85a970a	212	return tcf_generic_walker(tn, skb, cb, type, ops);
ddf97ccd WC	213	}
ddf97ccd WC	214
a85a970a	215	static int tcf_vlan_search(struct net net, struct tc_action *a, u32 index)
ddf97ccd WC	216	{
	217	struct tc_action_net *tn = net_generic(net, vlan_net_id);
	218
	219	return tcf_hash_search(tn, a, index);
	220	}
	221
c7e2b968 JP	222	static struct tc_action_ops act_vlan_ops = {
	223	.kind = "vlan",
	224	.type = TCA_ACT_VLAN,
	225	.owner = THIS_MODULE,
	226	.act = tcf_vlan,
	227	.dump = tcf_vlan_dump,
	228	.init = tcf_vlan_init,
ddf97ccd WC	229	.walk = tcf_vlan_walker,
ddf97ccd WC	230	.lookup = tcf_vlan_search,
a85a970a	231	.size = sizeof(struct tcf_vlan),
ddf97ccd WC	232	};
	233
	234	static __net_init int vlan_init_net(struct net *net)
	235	{
	236	struct tc_action_net *tn = net_generic(net, vlan_net_id);
	237
	238	return tc_action_net_init(tn, &act_vlan_ops, VLAN_TAB_MASK);
	239	}
	240
	241	static void __net_exit vlan_exit_net(struct net *net)
	242	{
	243	struct tc_action_net *tn = net_generic(net, vlan_net_id);
	244
	245	tc_action_net_exit(tn);
	246	}
	247
	248	static struct pernet_operations vlan_net_ops = {
	249	.init = vlan_init_net,
	250	.exit = vlan_exit_net,
	251	.id = &vlan_net_id,
	252	.size = sizeof(struct tc_action_net),
c7e2b968 JP	253	};
	254
	255	static int __init vlan_init_module(void)
	256	{
ddf97ccd	257	return tcf_register_action(&act_vlan_ops, &vlan_net_ops);
c7e2b968 JP	258	}
	259
	260	static void __exit vlan_cleanup_module(void)
	261	{
ddf97ccd	262	tcf_unregister_action(&act_vlan_ops, &vlan_net_ops);
c7e2b968 JP	263	}
	264
	265	module_init(vlan_init_module);
	266	module_exit(vlan_cleanup_module);
	267
	268	MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
	269	MODULE_DESCRIPTION("vlan manipulation actions");
	270	MODULE_LICENSE("GPL v2");