[net-next-2.6.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 <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 },
};

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_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))
			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_info *vlan = vlan_dev_info(dev);
	struct net_device *real_dev;
	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;

	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_id);
	if (err < 0)
		return err;

	if (!tb[IFLA_MTU])
		dev->mtu = real_dev->mtu;
	else if (dev->mtu > real_dev->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_info *vlan = vlan_dev_info(dev);

	return nla_total_size(2) +	/* IFLA_VLAN_ID */
	       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_info *vlan = vlan_dev_info(dev);
	struct vlan_priority_tci_mapping *pm;
	struct ifla_vlan_flags f;
	struct ifla_vlan_qos_mapping m;
	struct nlattr *nest;
	unsigned int i;

	NLA_PUT_U16(skb, IFLA_VLAN_ID, vlan_dev_info(dev)->vlan_id);
	if (vlan->flags) {
		f.flags = vlan->flags;
		f.mask  = ~0;
		NLA_PUT(skb, IFLA_VLAN_FLAGS, sizeof(f), &f);
	}
	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];
			NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
				sizeof(m), &m);
		}
		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;
				NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
					sizeof(m), &m);
			}
		}
		nla_nest_end(skb, nest);
	}
	return 0;

nla_put_failure:
	return -EMSGSIZE;
}

struct rtnl_link_ops vlan_link_ops __read_mostly = {
	.kind		= "vlan",
	.maxtype	= IFLA_VLAN_MAX,
	.policy		= vlan_policy,
	.priv_size	= sizeof(struct vlan_dev_info),
	.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,
};

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>
881d966b	14	#include <net/net_namespace.h>
07b5b17e PM	15	#include <net/netlink.h>
	16	#include <net/rtnetlink.h>
	17	#include "vlan.h"
	18
	19
	20	static const struct nla_policy vlan_policy[IFLA_VLAN_MAX + 1] = {
	21	[IFLA_VLAN_ID] = { .type = NLA_U16 },
	22	[IFLA_VLAN_FLAGS] = { .len = sizeof(struct ifla_vlan_flags) },
	23	[IFLA_VLAN_EGRESS_QOS] = { .type = NLA_NESTED },
	24	[IFLA_VLAN_INGRESS_QOS] = { .type = NLA_NESTED },
	25	};
	26
	27	static const struct nla_policy vlan_map_policy[IFLA_VLAN_QOS_MAX + 1] = {
	28	[IFLA_VLAN_QOS_MAPPING] = { .len = sizeof(struct ifla_vlan_qos_mapping) },
	29	};
	30
	31
	32	static inline int vlan_validate_qos_map(struct nlattr *attr)
	33	{
	34	if (!attr)
	35	return 0;
	36	return nla_validate_nested(attr, IFLA_VLAN_QOS_MAX, vlan_map_policy);
	37	}
	38
	39	static int vlan_validate(struct nlattr tb[], struct nlattr data[])
	40	{
	41	struct ifla_vlan_flags *flags;
	42	u16 id;
	43	int err;
	44
0e06877c PM	45	if (tb[IFLA_ADDRESS]) {
	46	if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
	47	return -EINVAL;
	48	if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
	49	return -EADDRNOTAVAIL;
	50	}
	51
07b5b17e PM	52	if (!data)
	53	return -EINVAL;
	54
	55	if (data[IFLA_VLAN_ID]) {
	56	id = nla_get_u16(data[IFLA_VLAN_ID]);
	57	if (id >= VLAN_VID_MASK)
	58	return -ERANGE;
	59	}
	60	if (data[IFLA_VLAN_FLAGS]) {
	61	flags = nla_data(data[IFLA_VLAN_FLAGS]);
70c03b49	62	if ((flags->flags & flags->mask) &
5e756593 PM	63	~(VLAN_FLAG_REORDER_HDR \| VLAN_FLAG_GVRP \|
5e756593 PM	64	VLAN_FLAG_LOOSE_BINDING))
07b5b17e PM	65	return -EINVAL;
	66	}
	67
	68	err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
	69	if (err < 0)
	70	return err;
	71	err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
	72	if (err < 0)
	73	return err;
	74	return 0;
	75	}
	76
	77	static int vlan_changelink(struct net_device *dev,
	78	struct nlattr tb[], struct nlattr data[])
	79	{
07b5b17e PM	80	struct ifla_vlan_flags *flags;
	81	struct ifla_vlan_qos_mapping *m;
	82	struct nlattr *attr;
	83	int rem;
	84
	85	if (data[IFLA_VLAN_FLAGS]) {
	86	flags = nla_data(data[IFLA_VLAN_FLAGS]);
b3ce0325	87	vlan_dev_change_flags(dev, flags->flags, flags->mask);
07b5b17e PM	88	}
	89	if (data[IFLA_VLAN_INGRESS_QOS]) {
	90	nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
	91	m = nla_data(attr);
	92	vlan_dev_set_ingress_priority(dev, m->to, m->from);
	93	}
	94	}
	95	if (data[IFLA_VLAN_EGRESS_QOS]) {
	96	nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
	97	m = nla_data(attr);
	98	vlan_dev_set_egress_priority(dev, m->from, m->to);
	99	}
	100	}
	101	return 0;
	102	}
	103
81adee47	104	static int vlan_newlink(struct net src_net, struct net_device dev,
07b5b17e PM	105	struct nlattr tb[], struct nlattr data[])
07b5b17e PM	106	{
9dfebcc6	107	struct vlan_dev_info *vlan = vlan_dev_info(dev);
07b5b17e PM	108	struct net_device *real_dev;
	109	int err;
	110
	111	if (!data[IFLA_VLAN_ID])
	112	return -EINVAL;
	113
	114	if (!tb[IFLA_LINK])
	115	return -EINVAL;
81adee47	116	real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
07b5b17e PM	117	if (!real_dev)
	118	return -ENODEV;
	119
	120	vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]);
	121	vlan->real_dev = real_dev;
	122	vlan->flags = VLAN_FLAG_REORDER_HDR;
	123
	124	err = vlan_check_real_dev(real_dev, vlan->vlan_id);
	125	if (err < 0)
	126	return err;
	127
	128	if (!tb[IFLA_MTU])
	129	dev->mtu = real_dev->mtu;
	130	else if (dev->mtu > real_dev->mtu)
	131	return -EINVAL;
	132
	133	err = vlan_changelink(dev, tb, data);
	134	if (err < 0)
	135	return err;
	136
	137	return register_vlan_dev(dev);
	138	}
	139
07b5b17e PM	140	static inline size_t vlan_qos_map_size(unsigned int n)
	141	{
	142	if (n == 0)
	143	return 0;
	144	/* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
	145	return nla_total_size(sizeof(struct nlattr)) +
	146	nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
	147	}
	148
	149	static size_t vlan_get_size(const struct net_device *dev)
	150	{
9dfebcc6	151	struct vlan_dev_info *vlan = vlan_dev_info(dev);
07b5b17e PM	152
07b5b17e PM	153	return nla_total_size(2) + /* IFLA_VLAN_ID */
fc482cc5	154	sizeof(struct ifla_vlan_flags) + /* IFLA_VLAN_FLAGS */
07b5b17e PM	155	vlan_qos_map_size(vlan->nr_ingress_mappings) +
	156	vlan_qos_map_size(vlan->nr_egress_mappings);
	157	}
	158
	159	static int vlan_fill_info(struct sk_buff skb, const struct net_device dev)
	160	{
9dfebcc6	161	struct vlan_dev_info *vlan = vlan_dev_info(dev);
07b5b17e PM	162	struct vlan_priority_tci_mapping *pm;
	163	struct ifla_vlan_flags f;
	164	struct ifla_vlan_qos_mapping m;
	165	struct nlattr *nest;
	166	unsigned int i;
	167
9dfebcc6	168	NLA_PUT_U16(skb, IFLA_VLAN_ID, vlan_dev_info(dev)->vlan_id);
07b5b17e PM	169	if (vlan->flags) {
	170	f.flags = vlan->flags;
	171	f.mask = ~0;
	172	NLA_PUT(skb, IFLA_VLAN_FLAGS, sizeof(f), &f);
	173	}
	174	if (vlan->nr_ingress_mappings) {
	175	nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
	176	if (nest == NULL)
	177	goto nla_put_failure;
	178
	179	for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
	180	if (!vlan->ingress_priority_map[i])
	181	continue;
	182
	183	m.from = i;
	184	m.to = vlan->ingress_priority_map[i];
	185	NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
	186	sizeof(m), &m);
	187	}
	188	nla_nest_end(skb, nest);
	189	}
	190
	191	if (vlan->nr_egress_mappings) {
	192	nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
	193	if (nest == NULL)
	194	goto nla_put_failure;
	195
	196	for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
	197	for (pm = vlan->egress_priority_map[i]; pm;
	198	pm = pm->next) {
	199	if (!pm->vlan_qos)
	200	continue;
	201
	202	m.from = pm->priority;
	203	m.to = (pm->vlan_qos >> 13) & 0x7;
	204	NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
	205	sizeof(m), &m);
	206	}
	207	}
	208	nla_nest_end(skb, nest);
	209	}
	210	return 0;
	211
	212	nla_put_failure:
	213	return -EMSGSIZE;
	214	}
	215
	216	struct rtnl_link_ops vlan_link_ops __read_mostly = {
	217	.kind = "vlan",
	218	.maxtype = IFLA_VLAN_MAX,
	219	.policy = vlan_policy,
	220	.priv_size = sizeof(struct vlan_dev_info),
	221	.setup = vlan_setup,
	222	.validate = vlan_validate,
	223	.newlink = vlan_newlink,
	224	.changelink = vlan_changelink,
af301517	225	.dellink = unregister_vlan_dev,
07b5b17e PM	226	.get_size = vlan_get_size,
	227	.fill_info = vlan_fill_info,
	228	};
	229
	230	int __init vlan_netlink_init(void)
	231	{
	232	return rtnl_link_register(&vlan_link_ops);
	233	}
	234
	235	void __exit vlan_netlink_fini(void)
	236	{
	237	rtnl_link_unregister(&vlan_link_ops);
	238	}
	239
	240	MODULE_ALIAS_RTNL_LINK("vlan");