linux-imx

/*

 * net/ipv6/fib6_rules.c    IPv6 Routing Policy Rules

 *

 * Copyright (C)2003-2006 Helsinki University of Technology

 * Copyright (C)2003-2006 USAGI/WIDE Project

 *

 *  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, version 2.

 *

 * Authors

 *  Thomas Graf     <tgraf@suug.ch>

 *  Ville Nuorvala      <vnuorval@tcs.hut.fi>

 */

​

#include <linux/netdevice.h>

#include <linux/notifier.h>

#include <linux/export.h>

​

#include <net/fib_rules.h>

#include <net/ipv6.h>

#include <net/addrconf.h>

#include <net/ip6_route.h>

#include <net/netlink.h>

​

struct fib6_rule {

    struct fib_rule     common;

    struct rt6key       src;

    struct rt6key       dst;

    u8          tclass;

};

​

static bool fib6_rule_matchall(const struct fib_rule *rule)

{

    struct fib6_rule *r = container_of(rule, struct fib6_rule, common);

​

    if (r->dst.plen || r->src.plen || r->tclass)

        return false;

    return fib_rule_matchall(rule);

}

​

bool fib6_rule_default(const struct fib_rule *rule)

{

    if (!fib6_rule_matchall(rule) || rule->action != FR_ACT_TO_TBL ||

        rule->l3mdev)

        return false;

    if (rule->table != RT6_TABLE_LOCAL && rule->table != RT6_TABLE_MAIN)

        return false;

    return true;

}

EXPORT_SYMBOL_GPL(fib6_rule_default);

​

int fib6_rules_dump(struct net *net, struct notifier_block *nb)

{

    return fib_rules_dump(net, nb, AF_INET6);

}

​

unsigned int fib6_rules_seq_read(struct net *net)

{

    return fib_rules_seq_read(net, AF_INET6);

}

​

/* called with rcu lock held; no reference taken on fib6_info */

struct fib6_info *fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,

                  int flags)

{

    struct fib6_info *f6i;

    int err;

​

    if (net->ipv6.fib6_has_custom_rules) {

        struct fib_lookup_arg arg = {

            .lookup_ptr = fib6_table_lookup,

            .lookup_data = &oif,

            .flags = FIB_LOOKUP_NOREF,

        };

​

        l3mdev_update_flow(net, flowi6_to_flowi(fl6));

​

        err = fib_rules_lookup(net->ipv6.fib6_rules_ops,

                       flowi6_to_flowi(fl6), flags, &arg);

        if (err)

            return ERR_PTR(err);

​

        f6i = arg.result ? : net->ipv6.fib6_null_entry;

    } else {

        f6i = fib6_table_lookup(net, net->ipv6.fib6_local_tbl,

                    oif, fl6, flags);

        if (!f6i || f6i == net->ipv6.fib6_null_entry)

            f6i = fib6_table_lookup(net, net->ipv6.fib6_main_tbl,

                        oif, fl6, flags);

    }

​