[linux.git] / net / 8021q / vlan_netlink.c

/*
 *	VLAN netlink control interface
 *
 * 	Copyright (c) 2007 Patrick McHardy <[email protected]>
 *
 *	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/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 vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
	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->flags = (vlan->flags & ~flags->mask) |
			      (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(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 void vlan_dellink(struct net_device *dev)
{
	unregister_vlan_device(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	= vlan_dellink,
	.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 <[email protected]>
	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>
	14	#include <net/netlink.h>
	15	#include <net/rtnetlink.h>
	16	#include "vlan.h"
	17
	18
	19	static const struct nla_policy vlan_policy[IFLA_VLAN_MAX + 1] = {
	20	[IFLA_VLAN_ID] = { .type = NLA_U16 },
	21	[IFLA_VLAN_FLAGS] = { .len = sizeof(struct ifla_vlan_flags) },
	22	[IFLA_VLAN_EGRESS_QOS] = { .type = NLA_NESTED },
	23	[IFLA_VLAN_INGRESS_QOS] = { .type = NLA_NESTED },
	24	};
	25
	26	static const struct nla_policy vlan_map_policy[IFLA_VLAN_QOS_MAX + 1] = {
	27	[IFLA_VLAN_QOS_MAPPING] = { .len = sizeof(struct ifla_vlan_qos_mapping) },
	28	};
	29
	30
	31	static inline int vlan_validate_qos_map(struct nlattr *attr)
	32	{
	33	if (!attr)
	34	return 0;
	35	return nla_validate_nested(attr, IFLA_VLAN_QOS_MAX, vlan_map_policy);
	36	}
	37
	38	static int vlan_validate(struct nlattr tb[], struct nlattr data[])
	39	{
	40	struct ifla_vlan_flags *flags;
	41	u16 id;
	42	int err;
	43
0e06877c PM	44	if (tb[IFLA_ADDRESS]) {
	45	if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
	46	return -EINVAL;
	47	if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
	48	return -EADDRNOTAVAIL;
	49	}
	50
07b5b17e PM	51	if (!data)
	52	return -EINVAL;
	53
	54	if (data[IFLA_VLAN_ID]) {
	55	id = nla_get_u16(data[IFLA_VLAN_ID]);
	56	if (id >= VLAN_VID_MASK)
	57	return -ERANGE;
	58	}
	59	if (data[IFLA_VLAN_FLAGS]) {
	60	flags = nla_data(data[IFLA_VLAN_FLAGS]);
	61	if ((flags->flags & flags->mask) & ~VLAN_FLAG_REORDER_HDR)
	62	return -EINVAL;
	63	}
	64
	65	err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
	66	if (err < 0)
	67	return err;
	68	err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
	69	if (err < 0)
	70	return err;
	71	return 0;
	72	}
	73
	74	static int vlan_changelink(struct net_device *dev,
	75	struct nlattr tb[], struct nlattr data[])
	76	{
	77	struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
	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]);
	85	vlan->flags = (vlan->flags & ~flags->mask) \|
	86	(flags->flags & flags->mask);
	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	{
	106	struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
	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;
115	real_dev = __dev_get_by_index(nla_get_u32(tb[IFLA_LINK]));
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
139	static void vlan_dellink(struct net_device *dev)
140	{
141	unregister_vlan_device(dev);
142	}
143
144	static inline size_t vlan_qos_map_size(unsigned int n)
145	{
146	if (n == 0)
147	return 0;
148	/* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
149	return nla_total_size(sizeof(struct nlattr)) +
150	nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
151	}
152
153	static size_t vlan_get_size(const struct net_device *dev)
154	{
155	struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
156
157	return nla_total_size(2) + /* IFLA_VLAN_ID */
158	vlan_qos_map_size(vlan->nr_ingress_mappings) +
159	vlan_qos_map_size(vlan->nr_egress_mappings);
160	}
161
162	static int vlan_fill_info(struct sk_buff skb, const struct net_device dev)
163	{
164	struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
165	struct vlan_priority_tci_mapping *pm;
166	struct ifla_vlan_flags f;
167	struct ifla_vlan_qos_mapping m;
168	struct nlattr *nest;
169	unsigned int i;
170
171	NLA_PUT_U16(skb, IFLA_VLAN_ID, VLAN_DEV_INFO(dev)->vlan_id);
172	if (vlan->flags) {
173	f.flags = vlan->flags;
174	f.mask = ~0;
175	NLA_PUT(skb, IFLA_VLAN_FLAGS, sizeof(f), &f);
176	}
177	if (vlan->nr_ingress_mappings) {
178	nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
179	if (nest == NULL)
180	goto nla_put_failure;
181
182	for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
183	if (!vlan->ingress_priority_map[i])
184	continue;
185
186	m.from = i;
187	m.to = vlan->ingress_priority_map[i];
188	NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
189	sizeof(m), &m);
190	}
191	nla_nest_end(skb, nest);
192	}
193
194	if (vlan->nr_egress_mappings) {
195	nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
196	if (nest == NULL)
197	goto nla_put_failure;
198
199	for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
200	for (pm = vlan->egress_priority_map[i]; pm;
201	pm = pm->next) {
202	if (!pm->vlan_qos)
203	continue;
204
205	m.from = pm->priority;
206	m.to = (pm->vlan_qos >> 13) & 0x7;
207	NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
208	sizeof(m), &m);
209	}
210	}
211	nla_nest_end(skb, nest);
212	}
213	return 0;
214
215	nla_put_failure:
216	return -EMSGSIZE;
217	}
218
219	struct rtnl_link_ops vlan_link_ops __read_mostly = {
220	.kind = "vlan",
221	.maxtype = IFLA_VLAN_MAX,
222	.policy = vlan_policy,
223	.priv_size = sizeof(struct vlan_dev_info),
224	.setup = vlan_setup,
225	.validate = vlan_validate,
226	.newlink = vlan_newlink,
227	.changelink = vlan_changelink,
228	.dellink = vlan_dellink,
229	.get_size = vlan_get_size,
230	.fill_info = vlan_fill_info,
231	};
232
233	int __init vlan_netlink_init(void)
234	{
235	return rtnl_link_register(&vlan_link_ops);
236	}
237
238	void __exit vlan_netlink_fini(void)
239	{
240	rtnl_link_unregister(&vlan_link_ops);
241	}
242
243	MODULE_ALIAS_RTNL_LINK("vlan");