linux-imx

/*

 *  IPv6 virtual tunneling interface

 *

 *  Copyright (C) 2013 secunet Security Networks AG

 *

 *  Author:

 *  Steffen Klassert <steffen.klassert@secunet.com>

 *

 *  Based on:

 *  net/ipv6/ip6_tunnel.c

 *

 *  This program is free software; you can redistribute it and/or

 *  modify it under the terms of the GNU General Public License

 *  as published by the Free Software Foundation; either version

 *  2 of the License, or (at your option) any later version.

 */

​

#include <linux/module.h>

#include <linux/capability.h>

#include <linux/errno.h>

#include <linux/types.h>

#include <linux/sockios.h>

#include <linux/icmp.h>

#include <linux/if.h>

#include <linux/in.h>

#include <linux/ip.h>

#include <linux/net.h>

#include <linux/in6.h>

#include <linux/netdevice.h>

#include <linux/if_arp.h>

#include <linux/icmpv6.h>

#include <linux/init.h>

#include <linux/route.h>

#include <linux/rtnetlink.h>

#include <linux/netfilter_ipv6.h>

#include <linux/slab.h>

#include <linux/hash.h>

​

#include <linux/uaccess.h>

#include <linux/atomic.h>

​

#include <net/icmp.h>

#include <net/ip.h>

#include <net/ip_tunnels.h>

#include <net/ipv6.h>

#include <net/ip6_route.h>

#include <net/addrconf.h>

#include <net/ip6_tunnel.h>

#include <net/xfrm.h>

#include <net/net_namespace.h>

#include <net/netns/generic.h>

#include <linux/etherdevice.h>

​

#define IP6_VTI_HASH_SIZE_SHIFT  5

#define IP6_VTI_HASH_SIZE (1 << IP6_VTI_HASH_SIZE_SHIFT)

​

static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)

{

    u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);

​

    return hash_32(hash, IP6_VTI_HASH_SIZE_SHIFT);

}

​

static int vti6_dev_init(struct net_device *dev);

static void vti6_dev_setup(struct net_device *dev);

static struct rtnl_link_ops vti6_link_ops __read_mostly;

​

static unsigned int vti6_net_id __read_mostly;

struct vti6_net {

    /* the vti6 tunnel fallback device */

    struct net_device *fb_tnl_dev;

    /* lists for storing tunnels in use */

    struct ip6_tnl __rcu *tnls_r_l[IP6_VTI_HASH_SIZE];

    struct ip6_tnl __rcu *tnls_wc[1];

    struct ip6_tnl __rcu **tnls[2];

};

​

#define for_each_vti6_tunnel_rcu(start) \

    for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))

​

/**

 * vti6_tnl_lookup - fetch tunnel matching the end-point addresses

 *   @net: network namespace

 *   @remote: the address of the tunnel exit-point

 *   @local: the address of the tunnel entry-point

 *

 * Return:

 *   tunnel matching given end-points if found,

 *   else fallback tunnel if its device is up,

 *   else %NULL

 **/

static struct ip6_tnl *