[GitHub/mt8127/android_kernel_alcatel_ttab.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 },
};

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_priv *vlan = vlan_dev_priv(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_priv *vlan = vlan_dev_priv(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_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;

	NLA_PUT_U16(skb, IFLA_VLAN_ID, vlan_dev_priv(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_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,
};

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 },
	26	};
	27
	28	static const struct nla_policy vlan_map_policy[IFLA_VLAN_QOS_MAX + 1] = {
	29	[IFLA_VLAN_QOS_MAPPING] = { .len = sizeof(struct ifla_vlan_qos_mapping) },
	30	};
	31
	32
	33	static inline int vlan_validate_qos_map(struct nlattr *attr)
	34	{
	35	if (!attr)
	36	return 0;
	37	return nla_validate_nested(attr, IFLA_VLAN_QOS_MAX, vlan_map_policy);
	38	}
	39
	40	static int vlan_validate(struct nlattr tb[], struct nlattr data[])
	41	{
	42	struct ifla_vlan_flags *flags;
	43	u16 id;
	44	int err;
	45
0e06877c PM	46	if (tb[IFLA_ADDRESS]) {
	47	if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
	48	return -EINVAL;
	49	if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
	50	return -EADDRNOTAVAIL;
	51	}
	52
07b5b17e PM	53	if (!data)
	54	return -EINVAL;
	55
	56	if (data[IFLA_VLAN_ID]) {
	57	id = nla_get_u16(data[IFLA_VLAN_ID]);
	58	if (id >= VLAN_VID_MASK)
	59	return -ERANGE;
	60	}
	61	if (data[IFLA_VLAN_FLAGS]) {
	62	flags = nla_data(data[IFLA_VLAN_FLAGS]);
70c03b49	63	if ((flags->flags & flags->mask) &
5e756593 PM	64	~(VLAN_FLAG_REORDER_HDR \| VLAN_FLAG_GVRP \|
5e756593 PM	65	VLAN_FLAG_LOOSE_BINDING))
07b5b17e PM	66	return -EINVAL;
	67	}
	68
	69	err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
	70	if (err < 0)
	71	return err;
	72	err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
	73	if (err < 0)
	74	return err;
	75	return 0;
	76	}
	77
	78	static int vlan_changelink(struct net_device *dev,
	79	struct nlattr tb[], struct nlattr data[])
	80	{
07b5b17e PM	81	struct ifla_vlan_flags *flags;
	82	struct ifla_vlan_qos_mapping *m;
	83	struct nlattr *attr;
	84	int rem;
	85
	86	if (data[IFLA_VLAN_FLAGS]) {
	87	flags = nla_data(data[IFLA_VLAN_FLAGS]);
b3ce0325	88	vlan_dev_change_flags(dev, flags->flags, flags->mask);
07b5b17e PM	89	}
	90	if (data[IFLA_VLAN_INGRESS_QOS]) {
	91	nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
	92	m = nla_data(attr);
	93	vlan_dev_set_ingress_priority(dev, m->to, m->from);
	94	}
	95	}
	96	if (data[IFLA_VLAN_EGRESS_QOS]) {
	97	nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
	98	m = nla_data(attr);
	99	vlan_dev_set_egress_priority(dev, m->from, m->to);
	100	}
	101	}
	102	return 0;
	103	}
	104
81adee47	105	static int vlan_newlink(struct net src_net, struct net_device dev,
07b5b17e PM	106	struct nlattr tb[], struct nlattr data[])
07b5b17e PM	107	{
7da82c06	108	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
07b5b17e PM	109	struct net_device *real_dev;
	110	int err;
	111
	112	if (!data[IFLA_VLAN_ID])
	113	return -EINVAL;
	114
	115	if (!tb[IFLA_LINK])
	116	return -EINVAL;
81adee47	117	real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
07b5b17e PM	118	if (!real_dev)
	119	return -ENODEV;
	120
	121	vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]);
	122	vlan->real_dev = real_dev;
	123	vlan->flags = VLAN_FLAG_REORDER_HDR;
	124
	125	err = vlan_check_real_dev(real_dev, vlan->vlan_id);
	126	if (err < 0)
	127	return err;
	128
	129	if (!tb[IFLA_MTU])
	130	dev->mtu = real_dev->mtu;
	131	else if (dev->mtu > real_dev->mtu)
	132	return -EINVAL;
	133
	134	err = vlan_changelink(dev, tb, data);
	135	if (err < 0)
	136	return err;
	137
	138	return register_vlan_dev(dev);
	139	}
	140
07b5b17e PM	141	static inline size_t vlan_qos_map_size(unsigned int n)
	142	{
	143	if (n == 0)
	144	return 0;
	145	/* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
	146	return nla_total_size(sizeof(struct nlattr)) +
	147	nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
	148	}
	149
	150	static size_t vlan_get_size(const struct net_device *dev)
	151	{
7da82c06	152	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
07b5b17e PM	153
07b5b17e PM	154	return nla_total_size(2) + /* IFLA_VLAN_ID */
fc482cc5	155	sizeof(struct ifla_vlan_flags) + /* IFLA_VLAN_FLAGS */
07b5b17e PM	156	vlan_qos_map_size(vlan->nr_ingress_mappings) +
	157	vlan_qos_map_size(vlan->nr_egress_mappings);
	158	}
	159
	160	static int vlan_fill_info(struct sk_buff skb, const struct net_device dev)
	161	{
7da82c06	162	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
07b5b17e PM	163	struct vlan_priority_tci_mapping *pm;
	164	struct ifla_vlan_flags f;
	165	struct ifla_vlan_qos_mapping m;
	166	struct nlattr *nest;
	167	unsigned int i;
	168
7da82c06	169	NLA_PUT_U16(skb, IFLA_VLAN_ID, vlan_dev_priv(dev)->vlan_id);
07b5b17e PM	170	if (vlan->flags) {
	171	f.flags = vlan->flags;
	172	f.mask = ~0;
	173	NLA_PUT(skb, IFLA_VLAN_FLAGS, sizeof(f), &f);
	174	}
	175	if (vlan->nr_ingress_mappings) {
	176	nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
	177	if (nest == NULL)
	178	goto nla_put_failure;
	179
	180	for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
	181	if (!vlan->ingress_priority_map[i])
	182	continue;
	183
	184	m.from = i;
	185	m.to = vlan->ingress_priority_map[i];
	186	NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
	187	sizeof(m), &m);
	188	}
	189	nla_nest_end(skb, nest);
	190	}
	191
	192	if (vlan->nr_egress_mappings) {
	193	nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
	194	if (nest == NULL)
	195	goto nla_put_failure;
	196
	197	for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
	198	for (pm = vlan->egress_priority_map[i]; pm;
	199	pm = pm->next) {
	200	if (!pm->vlan_qos)
	201	continue;
	202
	203	m.from = pm->priority;
	204	m.to = (pm->vlan_qos >> 13) & 0x7;
	205	NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
	206	sizeof(m), &m);
	207	}
	208	}
	209	nla_nest_end(skb, nest);
	210	}
	211	return 0;
	212
	213	nla_put_failure:
	214	return -EMSGSIZE;
	215	}
	216
	217	struct rtnl_link_ops vlan_link_ops __read_mostly = {
	218	.kind = "vlan",
	219	.maxtype = IFLA_VLAN_MAX,
	220	.policy = vlan_policy,
7da82c06	221	.priv_size = sizeof(struct vlan_dev_priv),
07b5b17e PM	222	.setup = vlan_setup,
	223	.validate = vlan_validate,
	224	.newlink = vlan_newlink,
	225	.changelink = vlan_changelink,
af301517	226	.dellink = unregister_vlan_dev,
07b5b17e PM	227	.get_size = vlan_get_size,
	228	.fill_info = vlan_fill_info,
	229	};
	230
	231	int __init vlan_netlink_init(void)
	232	{
	233	return rtnl_link_register(&vlan_link_ops);
	234	}
	235
	236	void __exit vlan_netlink_fini(void)
	237	{
	238	rtnl_link_unregister(&vlan_link_ops);
	239	}
	240
	241	MODULE_ALIAS_RTNL_LINK("vlan");