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