[mirror_ubuntu-zesty-kernel.git] / net / 8021q / vlan_netlink.c

/*
 *	VLAN netlink control interface
 *
 * 	Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License
 *	version 2 as published by the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/if_vlan.h>
#include <linux/module.h>
#include <net/net_namespace.h>
#include <net/netlink.h>
#include <net/rtnetlink.h>
#include "vlan.h"


static const struct nla_policy vlan_policy[IFLA_VLAN_MAX + 1] = {
	[IFLA_VLAN_ID]		= { .type = NLA_U16 },
	[IFLA_VLAN_FLAGS]	= { .len = sizeof(struct ifla_vlan_flags) },
	[IFLA_VLAN_EGRESS_QOS]	= { .type = NLA_NESTED },
	[IFLA_VLAN_INGRESS_QOS] = { .type = NLA_NESTED },
	[IFLA_VLAN_PROTOCOL]	= { .type = NLA_U16 },
};

static const struct nla_policy vlan_map_policy[IFLA_VLAN_QOS_MAX + 1] = {
	[IFLA_VLAN_QOS_MAPPING] = { .len = sizeof(struct ifla_vlan_qos_mapping) },
};


static inline int vlan_validate_qos_map(struct nlattr *attr)
{
	if (!attr)
		return 0;
	return nla_validate_nested(attr, IFLA_VLAN_QOS_MAX, vlan_map_policy);
}

static int vlan_validate(struct nlattr *tb[], struct nlattr *data[])
{
	struct ifla_vlan_flags *flags;
	u16 id;
	int err;

	if (tb[IFLA_ADDRESS]) {
		if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
			return -EINVAL;
		if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
			return -EADDRNOTAVAIL;
	}

	if (!data)
		return -EINVAL;

	if (data[IFLA_VLAN_PROTOCOL]) {
		switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) {
		case htons(ETH_P_8021Q):
		case htons(ETH_P_8021AD):
			break;
		default:
			return -EPROTONOSUPPORT;
		}
	}

	if (data[IFLA_VLAN_ID]) {
		id = nla_get_u16(data[IFLA_VLAN_ID]);
		if (id >= VLAN_VID_MASK)
			return -ERANGE;
	}
	if (data[IFLA_VLAN_FLAGS]) {
		flags = nla_data(data[IFLA_VLAN_FLAGS]);
		if ((flags->flags & flags->mask) &
		    ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
		      VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
			return -EINVAL;
	}

	err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
	if (err < 0)
		return err;
	err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
	if (err < 0)
		return err;
	return 0;
}

static int vlan_changelink(struct net_device *dev,
			   struct nlattr *tb[], struct nlattr *data[])
{
	struct ifla_vlan_flags *flags;
	struct ifla_vlan_qos_mapping *m;
	struct nlattr *attr;
	int rem;

	if (data[IFLA_VLAN_FLAGS]) {
		flags = nla_data(data[IFLA_VLAN_FLAGS]);
		vlan_dev_change_flags(dev, flags->flags, flags->mask);
	}
	if (data[IFLA_VLAN_INGRESS_QOS]) {
		nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
			m = nla_data(attr);
			vlan_dev_set_ingress_priority(dev, m->to, m->from);
		}
	}
	if (data[IFLA_VLAN_EGRESS_QOS]) {
		nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
			m = nla_data(attr);
			vlan_dev_set_egress_priority(dev, m->from, m->to);
		}
	}
	return 0;
}

static int vlan_newlink(struct net *src_net, struct net_device *dev,
			struct nlattr *tb[], struct nlattr *data[])
{
	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
	struct net_device *real_dev;
	unsigned int max_mtu;
	__be16 proto;
	int err;

	if (!data[IFLA_VLAN_ID])
		return -EINVAL;

	if (!tb[IFLA_LINK])
		return -EINVAL;
	real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
	if (!real_dev)
		return -ENODEV;

	if (data[IFLA_VLAN_PROTOCOL])
		proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
	else
		proto = htons(ETH_P_8021Q);

	vlan->vlan_proto = proto;
	vlan->vlan_id	 = nla_get_u16(data[IFLA_VLAN_ID]);
	vlan->real_dev	 = real_dev;
	vlan->flags	 = VLAN_FLAG_REORDER_HDR;

	err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id);
	if (err < 0)
		return err;

	max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN :
						     real_dev->mtu;
	if (!tb[IFLA_MTU])
		dev->mtu = max_mtu;
	else if (dev->mtu > max_mtu)
		return -EINVAL;

	err = vlan_changelink(dev, tb, data);
	if (err < 0)
		return err;

	return register_vlan_dev(dev);
}

static inline size_t vlan_qos_map_size(unsigned int n)
{
	if (n == 0)
		return 0;
	/* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
	return nla_total_size(sizeof(struct nlattr)) +
	       nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
}

static size_t vlan_get_size(const struct net_device *dev)
{
	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);

	return nla_total_size(2) +	/* IFLA_VLAN_PROTOCOL */
	       nla_total_size(2) +	/* IFLA_VLAN_ID */
	       nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */
	       vlan_qos_map_size(vlan->nr_ingress_mappings) +
	       vlan_qos_map_size(vlan->nr_egress_mappings);
}

static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
{
	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
	struct vlan_priority_tci_mapping *pm;
	struct ifla_vlan_flags f;
	struct ifla_vlan_qos_mapping m;
	struct nlattr *nest;
	unsigned int i;

	if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
	    nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
		goto nla_put_failure;
	if (vlan->flags) {
		f.flags = vlan->flags;
		f.mask  = ~0;
		if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
			goto nla_put_failure;
	}
	if (vlan->nr_ingress_mappings) {
		nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
		if (nest == NULL)
			goto nla_put_failure;

		for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
			if (!vlan->ingress_priority_map[i])
				continue;

			m.from = i;
			m.to   = vlan->ingress_priority_map[i];
			if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
				    sizeof(m), &m))
				goto nla_put_failure;
		}
		nla_nest_end(skb, nest);
	}

	if (vlan->nr_egress_mappings) {
		nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
		if (nest == NULL)
			goto nla_put_failure;

		for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
			for (pm = vlan->egress_priority_map[i]; pm;
			     pm = pm->next) {
				if (!pm->vlan_qos)
					continue;

				m.from = pm->priority;
				m.to   = (pm->vlan_qos >> 13) & 0x7;
				if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
					    sizeof(m), &m))
					goto nla_put_failure;
			}
		}
		nla_nest_end(skb, nest);
	}
	return 0;

nla_put_failure:
	return -EMSGSIZE;
}

static struct net *vlan_get_link_net(const struct net_device *dev)
{
	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;

	return dev_net(real_dev);
}

struct rtnl_link_ops vlan_link_ops __read_mostly = {
	.kind		= "vlan",
	.maxtype	= IFLA_VLAN_MAX,
	.policy		= vlan_policy,
	.priv_size	= sizeof(struct vlan_dev_priv),
	.setup		= vlan_setup,
	.validate	= vlan_validate,
	.newlink	= vlan_newlink,
	.changelink	= vlan_changelink,
	.dellink	= unregister_vlan_dev,
	.get_size	= vlan_get_size,
	.fill_info	= vlan_fill_info,
	.get_link_net	= vlan_get_link_net,
};

int __init vlan_netlink_init(void)
{
	return rtnl_link_register(&vlan_link_ops);
}

void __exit vlan_netlink_fini(void)
{
	rtnl_link_unregister(&vlan_link_ops);
}

MODULE_ALIAS_RTNL_LINK("vlan");
Commit	Line	Data
07b5b17e PM	1	/*
	2	* VLAN netlink control interface
	3	*
	4	* Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* version 2 as published by the Free Software Foundation.
	9	*/
	10
	11	#include <linux/kernel.h>
	12	#include <linux/netdevice.h>
	13	#include <linux/if_vlan.h>
3a9a231d	14	#include <linux/module.h>
881d966b	15	#include <net/net_namespace.h>
07b5b17e PM	16	#include <net/netlink.h>
	17	#include <net/rtnetlink.h>
	18	#include "vlan.h"
	19
	20
	21	static const struct nla_policy vlan_policy[IFLA_VLAN_MAX + 1] = {
	22	[IFLA_VLAN_ID] = { .type = NLA_U16 },
	23	[IFLA_VLAN_FLAGS] = { .len = sizeof(struct ifla_vlan_flags) },
	24	[IFLA_VLAN_EGRESS_QOS] = { .type = NLA_NESTED },
	25	[IFLA_VLAN_INGRESS_QOS] = { .type = NLA_NESTED },
8ad227ff	26	[IFLA_VLAN_PROTOCOL] = { .type = NLA_U16 },
07b5b17e PM	27	};
	28
	29	static const struct nla_policy vlan_map_policy[IFLA_VLAN_QOS_MAX + 1] = {
	30	[IFLA_VLAN_QOS_MAPPING] = { .len = sizeof(struct ifla_vlan_qos_mapping) },
	31	};
	32
	33
	34	static inline int vlan_validate_qos_map(struct nlattr *attr)
	35	{
	36	if (!attr)
	37	return 0;
	38	return nla_validate_nested(attr, IFLA_VLAN_QOS_MAX, vlan_map_policy);
	39	}
	40
	41	static int vlan_validate(struct nlattr tb[], struct nlattr data[])
	42	{
	43	struct ifla_vlan_flags *flags;
	44	u16 id;
	45	int err;
	46
0e06877c PM	47	if (tb[IFLA_ADDRESS]) {
	48	if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
	49	return -EINVAL;
	50	if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
	51	return -EADDRNOTAVAIL;
	52	}
	53
07b5b17e PM	54	if (!data)
	55	return -EINVAL;
	56
8ad227ff PM	57	if (data[IFLA_VLAN_PROTOCOL]) {
8ad227ff PM	58	switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) {
f0e78826 JP	59	case htons(ETH_P_8021Q):
f0e78826 JP	60	case htons(ETH_P_8021AD):
8ad227ff PM	61	break;
	62	default:
	63	return -EPROTONOSUPPORT;
	64	}
	65	}
	66
07b5b17e PM	67	if (data[IFLA_VLAN_ID]) {
	68	id = nla_get_u16(data[IFLA_VLAN_ID]);
	69	if (id >= VLAN_VID_MASK)
	70	return -ERANGE;
	71	}
	72	if (data[IFLA_VLAN_FLAGS]) {
	73	flags = nla_data(data[IFLA_VLAN_FLAGS]);
70c03b49	74	if ((flags->flags & flags->mask) &
5e756593	75	~(VLAN_FLAG_REORDER_HDR \| VLAN_FLAG_GVRP \|
86fbe9bb	76	VLAN_FLAG_LOOSE_BINDING \| VLAN_FLAG_MVRP))
07b5b17e PM	77	return -EINVAL;
	78	}
	79
	80	err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
	81	if (err < 0)
	82	return err;
	83	err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
	84	if (err < 0)
	85	return err;
	86	return 0;
	87	}
	88
	89	static int vlan_changelink(struct net_device *dev,
	90	struct nlattr tb[], struct nlattr data[])
	91	{
07b5b17e PM	92	struct ifla_vlan_flags *flags;
	93	struct ifla_vlan_qos_mapping *m;
	94	struct nlattr *attr;
	95	int rem;
	96
	97	if (data[IFLA_VLAN_FLAGS]) {
	98	flags = nla_data(data[IFLA_VLAN_FLAGS]);
b3ce0325	99	vlan_dev_change_flags(dev, flags->flags, flags->mask);
07b5b17e PM	100	}
	101	if (data[IFLA_VLAN_INGRESS_QOS]) {
	102	nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
	103	m = nla_data(attr);
	104	vlan_dev_set_ingress_priority(dev, m->to, m->from);
	105	}
	106	}
	107	if (data[IFLA_VLAN_EGRESS_QOS]) {
	108	nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
	109	m = nla_data(attr);
	110	vlan_dev_set_egress_priority(dev, m->from, m->to);
	111	}
	112	}
	113	return 0;
	114	}
	115
81adee47	116	static int vlan_newlink(struct net src_net, struct net_device dev,
07b5b17e PM	117	struct nlattr tb[], struct nlattr data[])
07b5b17e PM	118	{
7da82c06	119	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
07b5b17e	120	struct net_device *real_dev;
18d3df3e	121	unsigned int max_mtu;
8ad227ff	122	__be16 proto;
07b5b17e PM	123	int err;
	124
	125	if (!data[IFLA_VLAN_ID])
	126	return -EINVAL;
	127
	128	if (!tb[IFLA_LINK])
	129	return -EINVAL;
81adee47	130	real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
07b5b17e PM	131	if (!real_dev)
	132	return -ENODEV;
	133
8ad227ff PM	134	if (data[IFLA_VLAN_PROTOCOL])
	135	proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
	136	else
	137	proto = htons(ETH_P_8021Q);
	138
	139	vlan->vlan_proto = proto;
1fd9b1fc PM	140	vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]);
	141	vlan->real_dev = real_dev;
	142	vlan->flags = VLAN_FLAG_REORDER_HDR;
07b5b17e	143
1fd9b1fc	144	err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id);
07b5b17e PM	145	if (err < 0)
	146	return err;
	147
18d3df3e PA	148	max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN :
18d3df3e PA	149	real_dev->mtu;
07b5b17e	150	if (!tb[IFLA_MTU])
18d3df3e PA	151	dev->mtu = max_mtu;
18d3df3e PA	152	else if (dev->mtu > max_mtu)
07b5b17e PM	153	return -EINVAL;
	154
	155	err = vlan_changelink(dev, tb, data);
	156	if (err < 0)
	157	return err;
	158
	159	return register_vlan_dev(dev);
	160	}
	161
07b5b17e PM	162	static inline size_t vlan_qos_map_size(unsigned int n)
	163	{
	164	if (n == 0)
	165	return 0;
	166	/* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
	167	return nla_total_size(sizeof(struct nlattr)) +
	168	nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
	169	}
	170
	171	static size_t vlan_get_size(const struct net_device *dev)
	172	{
7da82c06	173	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
07b5b17e	174
8ad227ff PM	175	return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */
8ad227ff PM	176	nla_total_size(2) + /* IFLA_VLAN_ID */
c33a39c5	177	nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */
07b5b17e PM	178	vlan_qos_map_size(vlan->nr_ingress_mappings) +
	179	vlan_qos_map_size(vlan->nr_egress_mappings);
	180	}
	181
	182	static int vlan_fill_info(struct sk_buff skb, const struct net_device dev)
	183	{
7da82c06	184	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
07b5b17e PM	185	struct vlan_priority_tci_mapping *pm;
	186	struct ifla_vlan_flags f;
	187	struct ifla_vlan_qos_mapping m;
	188	struct nlattr *nest;
	189	unsigned int i;
	190
8ad227ff PM	191	if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) \|\|
8ad227ff PM	192	nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
61849dda	193	goto nla_put_failure;
07b5b17e PM	194	if (vlan->flags) {
	195	f.flags = vlan->flags;
	196	f.mask = ~0;
61849dda DM	197	if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
61849dda DM	198	goto nla_put_failure;
07b5b17e PM	199	}
	200	if (vlan->nr_ingress_mappings) {
	201	nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
	202	if (nest == NULL)
	203	goto nla_put_failure;
	204
	205	for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
	206	if (!vlan->ingress_priority_map[i])
	207	continue;
	208
	209	m.from = i;
	210	m.to = vlan->ingress_priority_map[i];
61849dda DM	211	if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
	212	sizeof(m), &m))
	213	goto nla_put_failure;
07b5b17e PM	214	}
	215	nla_nest_end(skb, nest);
	216	}
	217
	218	if (vlan->nr_egress_mappings) {
	219	nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
	220	if (nest == NULL)
	221	goto nla_put_failure;
	222
	223	for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
	224	for (pm = vlan->egress_priority_map[i]; pm;
	225	pm = pm->next) {
	226	if (!pm->vlan_qos)
	227	continue;
	228
	229	m.from = pm->priority;
	230	m.to = (pm->vlan_qos >> 13) & 0x7;
61849dda DM	231	if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
	232	sizeof(m), &m))
	233	goto nla_put_failure;
07b5b17e PM	234	}
	235	}
	236	nla_nest_end(skb, nest);
	237	}
	238	return 0;
	239
	240	nla_put_failure:
	241	return -EMSGSIZE;
	242	}
	243
1f17257b ND	244	static struct net vlan_get_link_net(const struct net_device dev)
	245	{
	246	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
	247
	248	return dev_net(real_dev);
	249	}
	250
07b5b17e PM	251	struct rtnl_link_ops vlan_link_ops __read_mostly = {
	252	.kind = "vlan",
	253	.maxtype = IFLA_VLAN_MAX,
	254	.policy = vlan_policy,
7da82c06	255	.priv_size = sizeof(struct vlan_dev_priv),
07b5b17e PM	256	.setup = vlan_setup,
	257	.validate = vlan_validate,
	258	.newlink = vlan_newlink,
	259	.changelink = vlan_changelink,
af301517	260	.dellink = unregister_vlan_dev,
07b5b17e PM	261	.get_size = vlan_get_size,
07b5b17e PM	262	.fill_info = vlan_fill_info,
1f17257b	263	.get_link_net = vlan_get_link_net,
07b5b17e PM	264	};
	265
	266	int __init vlan_netlink_init(void)
	267	{
	268	return rtnl_link_register(&vlan_link_ops);
	269	}
	270
	271	void __exit vlan_netlink_fini(void)
	272	{
	273	rtnl_link_unregister(&vlan_link_ops);
	274	}
	275
	276	MODULE_ALIAS_RTNL_LINK("vlan");