[mirror_ubuntu-zesty-kernel.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 unsigned 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;
	u16 tci;

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

	/* Ensure 'data' points at mac_header prior calling vlan manipulating
	 * functions.
	 */
	if (skb_at_tc_ingress(skb))
		skb_push_rcsum(skb, skb->mac_len);

	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;
	case TCA_VLAN_ACT_MODIFY:
		/* No-op if no vlan tag (either hw-accel or in-payload) */
		if (!skb_vlan_tagged(skb))
			goto unlock;
		/* extract existing tag (and guarantee no hw-accel tag) */
		if (skb_vlan_tag_present(skb)) {
			tci = skb_vlan_tag_get(skb);
			skb->vlan_tci = 0;
		} else {
			/* in-payload vlan tag, pop it */
			err = __skb_vlan_pop(skb, &tci);
			if (err)
				goto drop;
		}
		/* replace the vid */
		tci = (tci & ~VLAN_VID_MASK) | v->tcfv_push_vid;
		/* replace prio bits, if tcfv_push_prio specified */
		if (v->tcfv_push_prio) {
			tci &= ~VLAN_PRIO_MASK;
			tci |= v->tcfv_push_prio << VLAN_PRIO_SHIFT;
		}
		/* put updated tci as hwaccel tag */
		__vlan_hwaccel_put_tag(skb, v->tcfv_push_proto, tci);
		break;
	default:
		BUG();
	}

	goto unlock;

drop:
	action = TC_ACT_SHOT;
	v->tcf_qstats.drops++;
unlock:
	if (skb_at_tc_ingress(skb))
		skb_pull_rcsum(skb, skb->mac_len);

	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:
	case TCA_VLAN_ACT_MODIFY:
		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 ||
	     v->tcfv_action == TCA_VLAN_ACT_MODIFY) &&
	    (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
c7d03a00	24	static unsigned 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;
c7e2b968 JP	32	int err;
45a497f2	33	u16 tci;
c7e2b968 JP	34
c7e2b968 JP	35	spin_lock(&v->tcf_lock);
9c4a4e48	36	tcf_lastuse_update(&v->tcf_tm);
c7e2b968 JP	37	bstats_update(&v->tcf_bstats, skb);
	38	action = v->tcf_action;
	39
f39acc84 SL	40	/* Ensure 'data' points at mac_header prior calling vlan manipulating
	41	* functions.
	42	*/
	43	if (skb_at_tc_ingress(skb))
	44	skb_push_rcsum(skb, skb->mac_len);
	45
c7e2b968 JP	46	switch (v->tcfv_action) {
	47	case TCA_VLAN_ACT_POP:
	48	err = skb_vlan_pop(skb);
	49	if (err)
	50	goto drop;
	51	break;
	52	case TCA_VLAN_ACT_PUSH:
956af371 HHZ	53	err = skb_vlan_push(skb, v->tcfv_push_proto, v->tcfv_push_vid \|
956af371 HHZ	54	(v->tcfv_push_prio << VLAN_PRIO_SHIFT));
c7e2b968 JP	55	if (err)
	56	goto drop;
	57	break;
45a497f2 SL	58	case TCA_VLAN_ACT_MODIFY:
	59	/* No-op if no vlan tag (either hw-accel or in-payload) */
	60	if (!skb_vlan_tagged(skb))
	61	goto unlock;
	62	/* extract existing tag (and guarantee no hw-accel tag) */
	63	if (skb_vlan_tag_present(skb)) {
	64	tci = skb_vlan_tag_get(skb);
	65	skb->vlan_tci = 0;
	66	} else {
	67	/* in-payload vlan tag, pop it */
	68	err = __skb_vlan_pop(skb, &tci);
	69	if (err)
	70	goto drop;
	71	}
	72	/* replace the vid */
	73	tci = (tci & ~VLAN_VID_MASK) \| v->tcfv_push_vid;
	74	/* replace prio bits, if tcfv_push_prio specified */
	75	if (v->tcfv_push_prio) {
	76	tci &= ~VLAN_PRIO_MASK;
	77	tci \|= v->tcfv_push_prio << VLAN_PRIO_SHIFT;
	78	}
	79	/* put updated tci as hwaccel tag */
	80	__vlan_hwaccel_put_tag(skb, v->tcfv_push_proto, tci);
	81	break;
c7e2b968 JP	82	default:
	83	BUG();
	84	}
	85
	86	goto unlock;
	87
	88	drop:
	89	action = TC_ACT_SHOT;
	90	v->tcf_qstats.drops++;
	91	unlock:
f39acc84 SL	92	if (skb_at_tc_ingress(skb))
	93	skb_pull_rcsum(skb, skb->mac_len);
	94
c7e2b968 JP	95	spin_unlock(&v->tcf_lock);
	96	return action;
	97	}
	98
	99	static const struct nla_policy vlan_policy[TCA_VLAN_MAX + 1] = {
	100	[TCA_VLAN_PARMS] = { .len = sizeof(struct tc_vlan) },
	101	[TCA_VLAN_PUSH_VLAN_ID] = { .type = NLA_U16 },
	102	[TCA_VLAN_PUSH_VLAN_PROTOCOL] = { .type = NLA_U16 },
956af371	103	[TCA_VLAN_PUSH_VLAN_PRIORITY] = { .type = NLA_U8 },
c7e2b968 JP	104	};
	105
	106	static int tcf_vlan_init(struct net net, struct nlattr nla,
a85a970a	107	struct nlattr est, struct tc_action *a,
c7e2b968 JP	108	int ovr, int bind)
c7e2b968 JP	109	{
ddf97ccd	110	struct tc_action_net *tn = net_generic(net, vlan_net_id);
c7e2b968 JP	111	struct nlattr *tb[TCA_VLAN_MAX + 1];
	112	struct tc_vlan *parm;
	113	struct tcf_vlan *v;
	114	int action;
	115	__be16 push_vid = 0;
	116	__be16 push_proto = 0;
956af371	117	u8 push_prio = 0;
b2313077 WC	118	bool exists = false;
b2313077 WC	119	int ret = 0, err;
c7e2b968 JP	120
	121	if (!nla)
	122	return -EINVAL;
	123
	124	err = nla_parse_nested(tb, TCA_VLAN_MAX, nla, vlan_policy);
	125	if (err < 0)
	126	return err;
	127
	128	if (!tb[TCA_VLAN_PARMS])
	129	return -EINVAL;
	130	parm = nla_data(tb[TCA_VLAN_PARMS]);
5026c9b1 JHS	131	exists = tcf_hash_check(tn, parm->index, a, bind);
	132	if (exists && bind)
	133	return 0;
	134
c7e2b968 JP	135	switch (parm->v_action) {
	136	case TCA_VLAN_ACT_POP:
	137	break;
	138	case TCA_VLAN_ACT_PUSH:
45a497f2	139	case TCA_VLAN_ACT_MODIFY:
5026c9b1 JHS	140	if (!tb[TCA_VLAN_PUSH_VLAN_ID]) {
5026c9b1 JHS	141	if (exists)
a85a970a	142	tcf_hash_release(*a, bind);
c7e2b968	143	return -EINVAL;
5026c9b1	144	}
c7e2b968	145	push_vid = nla_get_u16(tb[TCA_VLAN_PUSH_VLAN_ID]);
5026c9b1 JHS	146	if (push_vid >= VLAN_VID_MASK) {
5026c9b1 JHS	147	if (exists)
a85a970a	148	tcf_hash_release(*a, bind);
c7e2b968	149	return -ERANGE;
5026c9b1	150	}
c7e2b968 JP	151
	152	if (tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]) {
	153	push_proto = nla_get_be16(tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]);
	154	switch (push_proto) {
	155	case htons(ETH_P_8021Q):
	156	case htons(ETH_P_8021AD):
	157	break;
	158	default:
	159	return -EPROTONOSUPPORT;
	160	}
	161	} else {
	162	push_proto = htons(ETH_P_8021Q);
	163	}
956af371 HHZ	164
	165	if (tb[TCA_VLAN_PUSH_VLAN_PRIORITY])
	166	push_prio = nla_get_u8(tb[TCA_VLAN_PUSH_VLAN_PRIORITY]);
c7e2b968 JP	167	break;
c7e2b968 JP	168	default:
5026c9b1	169	if (exists)
a85a970a	170	tcf_hash_release(*a, bind);
c7e2b968 JP	171	return -EINVAL;
	172	}
	173	action = parm->v_action;
	174
5026c9b1	175	if (!exists) {
ddf97ccd	176	ret = tcf_hash_create(tn, parm->index, est, a,
a85a970a	177	&act_vlan_ops, bind, false);
c7e2b968 JP	178	if (ret)
	179	return ret;
	180
	181	ret = ACT_P_CREATED;
	182	} else {
a85a970a	183	tcf_hash_release(*a, bind);
c7e2b968 JP	184	if (!ovr)
	185	return -EEXIST;
	186	}
	187
a85a970a	188	v = to_vlan(*a);
c7e2b968 JP	189
	190	spin_lock_bh(&v->tcf_lock);
	191
	192	v->tcfv_action = action;
	193	v->tcfv_push_vid = push_vid;
956af371	194	v->tcfv_push_prio = push_prio;
c7e2b968 JP	195	v->tcfv_push_proto = push_proto;
	196
	197	v->tcf_action = parm->action;
	198
	199	spin_unlock_bh(&v->tcf_lock);
	200
	201	if (ret == ACT_P_CREATED)
a85a970a	202	tcf_hash_insert(tn, *a);
c7e2b968 JP	203	return ret;
	204	}
	205
	206	static int tcf_vlan_dump(struct sk_buff skb, struct tc_action a,
	207	int bind, int ref)
	208	{
	209	unsigned char *b = skb_tail_pointer(skb);
a85a970a	210	struct tcf_vlan *v = to_vlan(a);
c7e2b968 JP	211	struct tc_vlan opt = {
	212	.index = v->tcf_index,
	213	.refcnt = v->tcf_refcnt - ref,
	214	.bindcnt = v->tcf_bindcnt - bind,
	215	.action = v->tcf_action,
	216	.v_action = v->tcfv_action,
	217	};
	218	struct tcf_t t;
	219
	220	if (nla_put(skb, TCA_VLAN_PARMS, sizeof(opt), &opt))
	221	goto nla_put_failure;
	222
45a497f2 SL	223	if ((v->tcfv_action == TCA_VLAN_ACT_PUSH \|\|
45a497f2 SL	224	v->tcfv_action == TCA_VLAN_ACT_MODIFY) &&
c7e2b968	225	(nla_put_u16(skb, TCA_VLAN_PUSH_VLAN_ID, v->tcfv_push_vid) \|\|
0b0f43fe	226	nla_put_be16(skb, TCA_VLAN_PUSH_VLAN_PROTOCOL,
956af371 HHZ	227	v->tcfv_push_proto) \|\|
	228	(nla_put_u8(skb, TCA_VLAN_PUSH_VLAN_PRIORITY,
	229	v->tcfv_push_prio))))
c7e2b968 JP	230	goto nla_put_failure;
c7e2b968 JP	231
48d8ee16	232	tcf_tm_dump(&t, &v->tcf_tm);
9854518e	233	if (nla_put_64bit(skb, TCA_VLAN_TM, sizeof(t), &t, TCA_VLAN_PAD))
c7e2b968 JP	234	goto nla_put_failure;
	235	return skb->len;
	236
	237	nla_put_failure:
	238	nlmsg_trim(skb, b);
	239	return -1;
	240	}
	241
ddf97ccd WC	242	static int tcf_vlan_walker(struct net net, struct sk_buff skb,
ddf97ccd WC	243	struct netlink_callback *cb, int type,
a85a970a	244	const struct tc_action_ops *ops)
ddf97ccd WC	245	{
	246	struct tc_action_net *tn = net_generic(net, vlan_net_id);
	247
a85a970a	248	return tcf_generic_walker(tn, skb, cb, type, ops);
ddf97ccd WC	249	}
ddf97ccd WC	250
a85a970a	251	static int tcf_vlan_search(struct net net, struct tc_action *a, u32 index)
ddf97ccd WC	252	{
	253	struct tc_action_net *tn = net_generic(net, vlan_net_id);
	254
	255	return tcf_hash_search(tn, a, index);
	256	}
	257
c7e2b968 JP	258	static struct tc_action_ops act_vlan_ops = {
	259	.kind = "vlan",
	260	.type = TCA_ACT_VLAN,
	261	.owner = THIS_MODULE,
	262	.act = tcf_vlan,
	263	.dump = tcf_vlan_dump,
	264	.init = tcf_vlan_init,
ddf97ccd WC	265	.walk = tcf_vlan_walker,
ddf97ccd WC	266	.lookup = tcf_vlan_search,
a85a970a	267	.size = sizeof(struct tcf_vlan),
ddf97ccd WC	268	};
	269
	270	static __net_init int vlan_init_net(struct net *net)
	271	{
	272	struct tc_action_net *tn = net_generic(net, vlan_net_id);
	273
	274	return tc_action_net_init(tn, &act_vlan_ops, VLAN_TAB_MASK);
	275	}
	276
	277	static void __net_exit vlan_exit_net(struct net *net)
	278	{
	279	struct tc_action_net *tn = net_generic(net, vlan_net_id);
	280
	281	tc_action_net_exit(tn);
	282	}
	283
	284	static struct pernet_operations vlan_net_ops = {
	285	.init = vlan_init_net,
	286	.exit = vlan_exit_net,
	287	.id = &vlan_net_id,
	288	.size = sizeof(struct tc_action_net),
c7e2b968 JP	289	};
	290
	291	static int __init vlan_init_module(void)
	292	{
ddf97ccd	293	return tcf_register_action(&act_vlan_ops, &vlan_net_ops);
c7e2b968 JP	294	}
	295
	296	static void __exit vlan_cleanup_module(void)
	297	{
ddf97ccd	298	tcf_unregister_action(&act_vlan_ops, &vlan_net_ops);
c7e2b968 JP	299	}
	300
	301	module_init(vlan_init_module);
	302	module_exit(vlan_cleanup_module);
	303
	304	MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
	305	MODULE_DESCRIPTION("vlan manipulation actions");
	306	MODULE_LICENSE("GPL v2");