[linux-2.6-block.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))
			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_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(dev_net(dev), 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 */
	       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 PM	62	if ((flags->flags & flags->mask) &
70c03b49 PM	63	~(VLAN_FLAG_REORDER_HDR \| VLAN_FLAG_GVRP))
07b5b17e PM	64	return -EINVAL;
	65	}
	66
	67	err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
	68	if (err < 0)
	69	return err;
	70	err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
	71	if (err < 0)
	72	return err;
	73	return 0;
	74	}
	75
	76	static int vlan_changelink(struct net_device *dev,
	77	struct nlattr tb[], struct nlattr data[])
	78	{
07b5b17e PM	79	struct ifla_vlan_flags *flags;
	80	struct ifla_vlan_qos_mapping *m;
	81	struct nlattr *attr;
	82	int rem;
	83
	84	if (data[IFLA_VLAN_FLAGS]) {
	85	flags = nla_data(data[IFLA_VLAN_FLAGS]);
b3ce0325	86	vlan_dev_change_flags(dev, flags->flags, flags->mask);
07b5b17e PM	87	}
	88	if (data[IFLA_VLAN_INGRESS_QOS]) {
	89	nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
	90	m = nla_data(attr);
	91	vlan_dev_set_ingress_priority(dev, m->to, m->from);
	92	}
	93	}
	94	if (data[IFLA_VLAN_EGRESS_QOS]) {
	95	nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
	96	m = nla_data(attr);
	97	vlan_dev_set_egress_priority(dev, m->from, m->to);
	98	}
	99	}
	100	return 0;
	101	}
	102
	103	static int vlan_newlink(struct net_device *dev,
	104	struct nlattr tb[], struct nlattr data[])
	105	{
9dfebcc6	106	struct vlan_dev_info *vlan = vlan_dev_info(dev);
07b5b17e PM	107	struct net_device *real_dev;
	108	int err;
	109
	110	if (!data[IFLA_VLAN_ID])
	111	return -EINVAL;
	112
	113	if (!tb[IFLA_LINK])
	114	return -EINVAL;
65d292a2	115	real_dev = __dev_get_by_index(dev_net(dev), nla_get_u32(tb[IFLA_LINK]));
07b5b17e PM	116	if (!real_dev)
	117	return -ENODEV;
	118
	119	vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]);
	120	vlan->real_dev = real_dev;
	121	vlan->flags = VLAN_FLAG_REORDER_HDR;
	122
	123	err = vlan_check_real_dev(real_dev, vlan->vlan_id);
	124	if (err < 0)
	125	return err;
	126
	127	if (!tb[IFLA_MTU])
	128	dev->mtu = real_dev->mtu;
	129	else if (dev->mtu > real_dev->mtu)
	130	return -EINVAL;
	131
	132	err = vlan_changelink(dev, tb, data);
	133	if (err < 0)
	134	return err;
	135
	136	return register_vlan_dev(dev);
	137	}
	138
07b5b17e PM	139	static inline size_t vlan_qos_map_size(unsigned int n)
	140	{
	141	if (n == 0)
	142	return 0;
	143	/* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
	144	return nla_total_size(sizeof(struct nlattr)) +
	145	nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
	146	}
	147
	148	static size_t vlan_get_size(const struct net_device *dev)
	149	{
9dfebcc6	150	struct vlan_dev_info *vlan = vlan_dev_info(dev);
07b5b17e PM	151
	152	return nla_total_size(2) + /* IFLA_VLAN_ID */
	153	vlan_qos_map_size(vlan->nr_ingress_mappings) +
	154	vlan_qos_map_size(vlan->nr_egress_mappings);
	155	}
	156
	157	static int vlan_fill_info(struct sk_buff skb, const struct net_device dev)
	158	{
9dfebcc6	159	struct vlan_dev_info *vlan = vlan_dev_info(dev);
07b5b17e PM	160	struct vlan_priority_tci_mapping *pm;
	161	struct ifla_vlan_flags f;
	162	struct ifla_vlan_qos_mapping m;
	163	struct nlattr *nest;
	164	unsigned int i;
	165
9dfebcc6	166	NLA_PUT_U16(skb, IFLA_VLAN_ID, vlan_dev_info(dev)->vlan_id);
07b5b17e PM	167	if (vlan->flags) {
	168	f.flags = vlan->flags;
	169	f.mask = ~0;
	170	NLA_PUT(skb, IFLA_VLAN_FLAGS, sizeof(f), &f);
	171	}
	172	if (vlan->nr_ingress_mappings) {
	173	nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
	174	if (nest == NULL)
	175	goto nla_put_failure;
	176
	177	for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
	178	if (!vlan->ingress_priority_map[i])
	179	continue;
	180
	181	m.from = i;
	182	m.to = vlan->ingress_priority_map[i];
	183	NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
	184	sizeof(m), &m);
	185	}
	186	nla_nest_end(skb, nest);
	187	}
	188
	189	if (vlan->nr_egress_mappings) {
	190	nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
	191	if (nest == NULL)
	192	goto nla_put_failure;
	193
	194	for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
	195	for (pm = vlan->egress_priority_map[i]; pm;
	196	pm = pm->next) {
	197	if (!pm->vlan_qos)
	198	continue;
	199
	200	m.from = pm->priority;
	201	m.to = (pm->vlan_qos >> 13) & 0x7;
	202	NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
	203	sizeof(m), &m);
	204	}
	205	}
	206	nla_nest_end(skb, nest);
	207	}
	208	return 0;
	209
	210	nla_put_failure:
	211	return -EMSGSIZE;
	212	}
	213
	214	struct rtnl_link_ops vlan_link_ops __read_mostly = {
	215	.kind = "vlan",
	216	.maxtype = IFLA_VLAN_MAX,
	217	.policy = vlan_policy,
	218	.priv_size = sizeof(struct vlan_dev_info),
	219	.setup = vlan_setup,
	220	.validate = vlan_validate,
	221	.newlink = vlan_newlink,
	222	.changelink = vlan_changelink,
af301517	223	.dellink = unregister_vlan_dev,
07b5b17e PM	224	.get_size = vlan_get_size,
	225	.fill_info = vlan_fill_info,
	226	};
	227
	228	int __init vlan_netlink_init(void)
	229	{
	230	return rtnl_link_register(&vlan_link_ops);
	231	}
	232
	233	void __exit vlan_netlink_fini(void)
	234	{
	235	rtnl_link_unregister(&vlan_link_ops);
	236	}
	237
	238	MODULE_ALIAS_RTNL_LINK("vlan");