net/8021q/vlan_netlink.c - arm/linux - Git at Google

 /*
  *	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 },
 	[IFLA_VLAN_PROTOCOL]	= { .type = NLA_U16 },
 };

 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,
 				   NULL);
 }

 static int vlan_validate(struct nlattr *tb[], struct nlattr *data[],
 			 struct netlink_ext_ack *extack)
 {
 	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_PROTOCOL]) {
 		switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) {
 		case htons(ETH_P_8021Q):
 		case htons(ETH_P_8021AD):
 			break;
 		default:
 			return -EPROTONOSUPPORT;
 		}
 	}

 	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 | VLAN_FLAG_MVRP))
 			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 netlink_ext_ack *extack)
 {
 	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 netlink_ext_ack *extack)
 {
 	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 	struct net_device *real_dev;
 	unsigned int max_mtu;
 	__be16 proto;
 	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;

 	if (data[IFLA_VLAN_PROTOCOL])
 		proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
 	else
 		proto = htons(ETH_P_8021Q);

 	vlan->vlan_proto = proto;
 	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_proto, vlan->vlan_id);
 	if (err < 0)
 		return err;

 	max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN :
 						     real_dev->mtu;
 	if (!tb[IFLA_MTU])
 		dev->mtu = max_mtu;
 	else if (dev->mtu > max_mtu)
 		return -EINVAL;

 	err = vlan_changelink(dev, tb, data, extack);
 	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_PROTOCOL */
 	       nla_total_size(2) +	/* IFLA_VLAN_ID */
 	       nla_total_size(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;

 	if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
 	    nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
 		goto nla_put_failure;
 	if (vlan->flags) {
 		f.flags = vlan->flags;
 		f.mask  = ~0;
 		if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
 			goto nla_put_failure;
 	}
 	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];
 			if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
 				    sizeof(m), &m))
 				goto nla_put_failure;
 		}
 		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;
 				if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
 					    sizeof(m), &m))
 					goto nla_put_failure;
 			}
 		}
 		nla_nest_end(skb, nest);
 	}
 	return 0;

 nla_put_failure:
 	return -EMSGSIZE;
 }

 static struct net *vlan_get_link_net(const struct net_device *dev)
 {
 	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;

 	return dev_net(real_dev);
 }

 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,
 	.get_link_net	= vlan_get_link_net,
 };

 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");
	/*
	* 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 },
	[IFLA_VLAN_PROTOCOL] = { .type = NLA_U16 },
	};

	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,
	NULL);
	}

	static int vlan_validate(struct nlattr tb[], struct nlattr data[],
	struct netlink_ext_ack *extack)
	{
	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_PROTOCOL]) {
	switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) {
	case htons(ETH_P_8021Q):
	case htons(ETH_P_8021AD):
	break;
	default:
	return -EPROTONOSUPPORT;
	}
	}

	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 \| VLAN_FLAG_MVRP))
	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 netlink_ext_ack *extack)
	{
	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 netlink_ext_ack *extack)
	{
	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
	struct net_device *real_dev;
	unsigned int max_mtu;
	__be16 proto;
	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;

	if (data[IFLA_VLAN_PROTOCOL])
	proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
	else
	proto = htons(ETH_P_8021Q);

	vlan->vlan_proto = proto;
	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_proto, vlan->vlan_id);
	if (err < 0)
	return err;

	max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN :
	real_dev->mtu;
	if (!tb[IFLA_MTU])
	dev->mtu = max_mtu;
	else if (dev->mtu > max_mtu)
	return -EINVAL;

	err = vlan_changelink(dev, tb, data, extack);
	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_PROTOCOL */
	nla_total_size(2) + /* IFLA_VLAN_ID */
	nla_total_size(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;

	if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) \|\|
	nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
	goto nla_put_failure;
	if (vlan->flags) {
	f.flags = vlan->flags;
	f.mask = ~0;
	if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
	goto nla_put_failure;
	}
	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];
	if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
	sizeof(m), &m))
	goto nla_put_failure;
	}
	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;
	if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
	sizeof(m), &m))
	goto nla_put_failure;
	}
	}
	nla_nest_end(skb, nest);
	}
	return 0;

	nla_put_failure:
	return -EMSGSIZE;
	}

	static struct net vlan_get_link_net(const struct net_device dev)
	{
	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;

	return dev_net(real_dev);
	}

	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,
	.get_link_net = vlan_get_link_net,
	};

	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");