linux-imx

/*

 *  IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT)

 *  Linux INET6 implementation

 *

 *  Authors:

 *  Pedro Roque     <roque@di.fc.ul.pt>

 *  Alexey Kuznetsov    <kuznet@ms2.inr.ac.ru>

 *

 *  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.

 *

 *  Changes:

 * Roger Venning <r.venning@telstra.com>:   6to4 support

 * Nate Thompson <nate@thebog.net>:     6to4 support

 * Fred Templin <fred.l.templin@boeing.com>:    isatap support

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/module.h>

#include <linux/capability.h>

#include <linux/errno.h>

#include <linux/types.h>

#include <linux/socket.h>

#include <linux/sockios.h>

#include <linux/net.h>

#include <linux/in6.h>

#include <linux/netdevice.h>

#include <linux/if_arp.h>

#include <linux/icmp.h>

#include <linux/slab.h>

#include <linux/uaccess.h>

#include <linux/init.h>

#include <linux/netfilter_ipv4.h>

#include <linux/if_ether.h>

​

#include <net/sock.h>

#include <net/snmp.h>

​

#include <net/ipv6.h>

#include <net/protocol.h>

#include <net/transp_v6.h>

#include <net/ip6_fib.h>

#include <net/ip6_route.h>

#include <net/ndisc.h>

#include <net/addrconf.h>

#include <net/ip.h>

#include <net/udp.h>

#include <net/icmp.h>

#include <net/ip_tunnels.h>

#include <net/inet_ecn.h>

#include <net/xfrm.h>

#include <net/dsfield.h>

#include <net/net_namespace.h>

#include <net/netns/generic.h>

​

/*

   This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c

​

   For comments look at net/ipv4/ip_gre.c --ANK

 */

​

#define IP6_SIT_HASH_SIZE  16

#define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)

​

static bool log_ecn_error = true;

module_param(log_ecn_error, bool, 0644);

MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");

​

static int ipip6_tunnel_init(struct net_device *dev);

static void ipip6_tunnel_setup(struct net_device *dev);

static void ipip6_dev_free(struct net_device *dev);

static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,

              __be32 *v4dst);

static struct rtnl_link_ops sit_link_ops __read_mostly;

​

static unsigned int sit_net_id __read_mostly;

struct sit_net {

    struct ip_tunnel __rcu *tunnels_r_l[IP6_SIT_HASH_SIZE];

    struct ip_tunnel __rcu *tunnels_r[IP6_SIT_HASH_SIZE];

    struct ip_tunnel __rcu *tunnels_l[IP6_SIT_HASH_SIZE];

    struct ip_tunnel __rcu *tunnels_wc[1];

    struct ip_tunnel __rcu **tunnels[4];

​

    struct net_device *fb_tunnel_dev;

};

​

/*

 * Must be invoked with rcu_read_lock

 */