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