/*
   *	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");