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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [net/] [ipv6/] [addrconf.c] - Blame information for rev 3

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/*
 *      IPv6 Address [auto]configuration
 *      Linux INET6 implementation
 *
 *      Authors:
 *      Pedro Roque             <roque@di.fc.ul.pt>
 *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
 *
 *      $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
 *
 *      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:
 *
 *      Janos Farkas                    :       delete timer on ifdown
 *      <chexum@bankinf.banki.hu>
 *      Andi Kleen                      :       kill double kfree on module
 *                                              unload.
 *      Maciej W. Rozycki               :       FDDI support
 *      sekiya@USAGI                    :       Don't send too many RS
 *                                              packets.
 *      yoshfuji@USAGI                  :       Fixed interval between DAD
 *                                              packets.
 *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
 *                                              address validation timer.
 *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
 *                                              support.
 *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
 *                                              address on a same interface.
 *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
 *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
 *                                              seq_file.
 *      YOSHIFUJI Hideaki @USAGI        :       improved source address
 *                                              selection; consider scope,
 *                                              status etc.
 */
 
#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_addr.h>
#include <linux/if_arp.h>
#include <linux/if_arcnet.h>
#include <linux/if_infiniband.h>
#include <linux/route.h>
#include <linux/inetdevice.h>
#include <linux/init.h>
#ifdef CONFIG_SYSCTL
#include <linux/sysctl.h>
#endif
#include <linux/capability.h>
#include <linux/delay.h>
#include <linux/notifier.h>
#include <linux/string.h>
 
#include <net/net_namespace.h>
#include <net/sock.h>
#include <net/snmp.h>
 
#include <net/ipv6.h>
#include <net/protocol.h>
#include <net/ndisc.h>
#include <net/ip6_route.h>
#include <net/addrconf.h>
#include <net/tcp.h>
#include <net/ip.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>
#include <linux/if_tunnel.h>
#include <linux/rtnetlink.h>
 
#ifdef CONFIG_IPV6_PRIVACY
#include <linux/random.h>
#endif
 
#include <asm/uaccess.h>
#include <asm/unaligned.h>
 
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
 
/* Set to 3 to get tracing... */
#define ACONF_DEBUG 2
 
#if ACONF_DEBUG >= 3
#define ADBG(x) printk x
#else
#define ADBG(x)
#endif
 
#define INFINITY_LIFE_TIME      0xFFFFFFFF
#define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
 
#ifdef CONFIG_SYSCTL
static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
#endif
 
#ifdef CONFIG_IPV6_PRIVACY
static int __ipv6_regen_rndid(struct inet6_dev *idev);
static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
static void ipv6_regen_rndid(unsigned long data);
 
static int desync_factor = MAX_DESYNC_FACTOR * HZ;
#endif
 
static int ipv6_count_addresses(struct inet6_dev *idev);
 
/*
 *      Configured unicast address hash table
 */
static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
static DEFINE_RWLOCK(addrconf_hash_lock);
 
static void addrconf_verify(unsigned long);
 
static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
static DEFINE_SPINLOCK(addrconf_verify_lock);
 
static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 
static int addrconf_ifdown(struct net_device *dev, int how);
 
static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
static void addrconf_dad_timer(unsigned long data);
static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
static void addrconf_dad_run(struct inet6_dev *idev);
static void addrconf_rs_timer(unsigned long data);
static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 
static void inet6_prefix_notify(int event, struct inet6_dev *idev,
                                struct prefix_info *pinfo);
static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
 
static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 
struct ipv6_devconf ipv6_devconf __read_mostly = {
        .forwarding             = 0,
        .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
        .mtu6                   = IPV6_MIN_MTU,
        .accept_ra              = 1,
        .accept_redirects       = 1,
        .autoconf               = 1,
        .force_mld_version      = 0,
        .dad_transmits          = 1,
        .rtr_solicits           = MAX_RTR_SOLICITATIONS,
        .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
        .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
#ifdef CONFIG_IPV6_PRIVACY
        .use_tempaddr           = 0,
        .temp_valid_lft         = TEMP_VALID_LIFETIME,
        .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
        .regen_max_retry        = REGEN_MAX_RETRY,
        .max_desync_factor      = MAX_DESYNC_FACTOR,
#endif
        .max_addresses          = IPV6_MAX_ADDRESSES,
        .accept_ra_defrtr       = 1,
        .accept_ra_pinfo        = 1,
#ifdef CONFIG_IPV6_ROUTER_PREF
        .accept_ra_rtr_pref     = 1,
        .rtr_probe_interval     = 60 * HZ,
#ifdef CONFIG_IPV6_ROUTE_INFO
        .accept_ra_rt_info_max_plen = 0,
#endif
#endif
        .proxy_ndp              = 0,
        .accept_source_route    = 0,     /* we do not accept RH0 by default. */
};
 
static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
        .forwarding             = 0,
        .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
        .mtu6                   = IPV6_MIN_MTU,
        .accept_ra              = 1,
        .accept_redirects       = 1,
        .autoconf               = 1,
        .dad_transmits          = 1,
        .rtr_solicits           = MAX_RTR_SOLICITATIONS,
        .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
        .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
#ifdef CONFIG_IPV6_PRIVACY
        .use_tempaddr           = 0,
        .temp_valid_lft         = TEMP_VALID_LIFETIME,
        .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
        .regen_max_retry        = REGEN_MAX_RETRY,
        .max_desync_factor      = MAX_DESYNC_FACTOR,
#endif
        .max_addresses          = IPV6_MAX_ADDRESSES,
        .accept_ra_defrtr       = 1,
        .accept_ra_pinfo        = 1,
#ifdef CONFIG_IPV6_ROUTER_PREF
        .accept_ra_rtr_pref     = 1,
        .rtr_probe_interval     = 60 * HZ,
#ifdef CONFIG_IPV6_ROUTE_INFO
        .accept_ra_rt_info_max_plen = 0,
#endif
#endif
        .proxy_ndp              = 0,
        .accept_source_route    = 0,     /* we do not accept RH0 by default. */
};
 
/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 
/* Check if a valid qdisc is available */
static inline int addrconf_qdisc_ok(struct net_device *dev)
{
        return (dev->qdisc != &noop_qdisc);
}
 
static void addrconf_del_timer(struct inet6_ifaddr *ifp)
{
        if (del_timer(&ifp->timer))
                __in6_ifa_put(ifp);
}
 
enum addrconf_timer_t
{
        AC_NONE,
        AC_DAD,
        AC_RS,
};
 
static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
                               enum addrconf_timer_t what,
                               unsigned long when)
{
        if (!del_timer(&ifp->timer))
                in6_ifa_hold(ifp);
 
        switch (what) {
        case AC_DAD:
                ifp->timer.function = addrconf_dad_timer;
                break;
        case AC_RS:
                ifp->timer.function = addrconf_rs_timer;
                break;
        default:;
        }
        ifp->timer.expires = jiffies + when;
        add_timer(&ifp->timer);
}
 
static int snmp6_alloc_dev(struct inet6_dev *idev)
{
        if (snmp_mib_init((void **)idev->stats.ipv6,
                          sizeof(struct ipstats_mib),
                          __alignof__(struct ipstats_mib)) < 0)
                goto err_ip;
        if (snmp_mib_init((void **)idev->stats.icmpv6,
                          sizeof(struct icmpv6_mib),
                          __alignof__(struct icmpv6_mib)) < 0)
                goto err_icmp;
        if (snmp_mib_init((void **)idev->stats.icmpv6msg,
                          sizeof(struct icmpv6msg_mib),
                          __alignof__(struct icmpv6msg_mib)) < 0)
                goto err_icmpmsg;
 
        return 0;
 
err_icmpmsg:
        snmp_mib_free((void **)idev->stats.icmpv6);
err_icmp:
        snmp_mib_free((void **)idev->stats.ipv6);
err_ip:
        return -ENOMEM;
}
 
static void snmp6_free_dev(struct inet6_dev *idev)
{
        snmp_mib_free((void **)idev->stats.icmpv6msg);
        snmp_mib_free((void **)idev->stats.icmpv6);
        snmp_mib_free((void **)idev->stats.ipv6);
}
 
/* Nobody refers to this device, we may destroy it. */
 
static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
{
        struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
        kfree(idev);
}
 
void in6_dev_finish_destroy(struct inet6_dev *idev)
{
        struct net_device *dev = idev->dev;
        BUG_TRAP(idev->addr_list==NULL);
        BUG_TRAP(idev->mc_list==NULL);
#ifdef NET_REFCNT_DEBUG
        printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
#endif
        dev_put(dev);
        if (!idev->dead) {
                printk("Freeing alive inet6 device %p\n", idev);
                return;
        }
        snmp6_free_dev(idev);
        call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
}
 
EXPORT_SYMBOL(in6_dev_finish_destroy);
 
static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
{
        struct inet6_dev *ndev;
        struct in6_addr maddr;
 
        ASSERT_RTNL();
 
        if (dev->mtu < IPV6_MIN_MTU)
                return NULL;
 
        ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 
        if (ndev == NULL)
                return NULL;
 
        rwlock_init(&ndev->lock);
        ndev->dev = dev;
        memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
        ndev->cnf.mtu6 = dev->mtu;
        ndev->cnf.sysctl = NULL;
        ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
        if (ndev->nd_parms == NULL) {
                kfree(ndev);
                return NULL;
        }
        /* We refer to the device */
        dev_hold(dev);
 
        if (snmp6_alloc_dev(ndev) < 0) {
                ADBG((KERN_WARNING
                        "%s(): cannot allocate memory for statistics; dev=%s.\n",
                        __FUNCTION__, dev->name));
                neigh_parms_release(&nd_tbl, ndev->nd_parms);
                ndev->dead = 1;
                in6_dev_finish_destroy(ndev);
                return NULL;
        }
 
        if (snmp6_register_dev(ndev) < 0) {
                ADBG((KERN_WARNING
                        "%s(): cannot create /proc/net/dev_snmp6/%s\n",
                        __FUNCTION__, dev->name));
                neigh_parms_release(&nd_tbl, ndev->nd_parms);
                ndev->dead = 1;
                in6_dev_finish_destroy(ndev);
                return NULL;
        }
 
        /* One reference from device.  We must do this before
         * we invoke __ipv6_regen_rndid().
         */
        in6_dev_hold(ndev);
 
#ifdef CONFIG_IPV6_PRIVACY
        init_timer(&ndev->regen_timer);
        ndev->regen_timer.function = ipv6_regen_rndid;
        ndev->regen_timer.data = (unsigned long) ndev;
        if ((dev->flags&IFF_LOOPBACK) ||
            dev->type == ARPHRD_TUNNEL ||
#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
            dev->type == ARPHRD_SIT ||
#endif
            dev->type == ARPHRD_NONE) {
                printk(KERN_INFO
                       "%s: Disabled Privacy Extensions\n",
                       dev->name);
                ndev->cnf.use_tempaddr = -1;
        } else {
                in6_dev_hold(ndev);
                ipv6_regen_rndid((unsigned long) ndev);
        }
#endif
 
        if (netif_running(dev) && addrconf_qdisc_ok(dev))
                ndev->if_flags |= IF_READY;
 
        ipv6_mc_init_dev(ndev);
        ndev->tstamp = jiffies;
#ifdef CONFIG_SYSCTL
        neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
                              NET_IPV6_NEIGH, "ipv6",
                              &ndisc_ifinfo_sysctl_change,
                              NULL);
        addrconf_sysctl_register(ndev, &ndev->cnf);
#endif
        /* protected by rtnl_lock */
        rcu_assign_pointer(dev->ip6_ptr, ndev);
 
        /* Join all-node multicast group */
        ipv6_addr_all_nodes(&maddr);
        ipv6_dev_mc_inc(dev, &maddr);
 
        return ndev;
}
 
static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
{
        struct inet6_dev *idev;
 
        ASSERT_RTNL();
 
        if ((idev = __in6_dev_get(dev)) == NULL) {
                if ((idev = ipv6_add_dev(dev)) == NULL)
                        return NULL;
        }
 
        if (dev->flags&IFF_UP)
                ipv6_mc_up(idev);
        return idev;
}
 
#ifdef CONFIG_SYSCTL
static void dev_forward_change(struct inet6_dev *idev)
{
        struct net_device *dev;
        struct inet6_ifaddr *ifa;
        struct in6_addr addr;
 
        if (!idev)
                return;
        dev = idev->dev;
        if (dev && (dev->flags & IFF_MULTICAST)) {
                ipv6_addr_all_routers(&addr);
 
                if (idev->cnf.forwarding)
                        ipv6_dev_mc_inc(dev, &addr);
                else
                        ipv6_dev_mc_dec(dev, &addr);
        }
        for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
                if (ifa->flags&IFA_F_TENTATIVE)
                        continue;
                if (idev->cnf.forwarding)
                        addrconf_join_anycast(ifa);
                else
                        addrconf_leave_anycast(ifa);
        }
}
 
 
static void addrconf_forward_change(void)
{
        struct net_device *dev;
        struct inet6_dev *idev;
 
        read_lock(&dev_base_lock);
        for_each_netdev(&init_net, dev) {
                rcu_read_lock();
                idev = __in6_dev_get(dev);
                if (idev) {
                        int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
                        idev->cnf.forwarding = ipv6_devconf.forwarding;
                        if (changed)
                                dev_forward_change(idev);
                }
                rcu_read_unlock();
        }
        read_unlock(&dev_base_lock);
}
#endif
 
/* Nobody refers to this ifaddr, destroy it */
 
void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
{
        BUG_TRAP(ifp->if_next==NULL);
        BUG_TRAP(ifp->lst_next==NULL);
#ifdef NET_REFCNT_DEBUG
        printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
#endif
 
        in6_dev_put(ifp->idev);
 
        if (del_timer(&ifp->timer))
                printk("Timer is still running, when freeing ifa=%p\n", ifp);
 
        if (!ifp->dead) {
                printk("Freeing alive inet6 address %p\n", ifp);
                return;
        }
        dst_release(&ifp->rt->u.dst);
 
        kfree(ifp);
}
 
static void
ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
{
        struct inet6_ifaddr *ifa, **ifap;
        int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 
        /*
         * Each device address list is sorted in order of scope -
         * global before linklocal.
         */
        for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
             ifap = &ifa->if_next) {
                if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
                        break;
        }
 
        ifp->if_next = *ifap;
        *ifap = ifp;
}
 
/* On success it returns ifp with increased reference count */
 
static struct inet6_ifaddr *
ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
              int scope, u32 flags)
{
        struct inet6_ifaddr *ifa = NULL;
        struct rt6_info *rt;
        int hash;
        int err = 0;
 
        rcu_read_lock_bh();
        if (idev->dead) {
                err = -ENODEV;                  /*XXX*/
                goto out2;
        }
 
        write_lock(&addrconf_hash_lock);
 
        /* Ignore adding duplicate addresses on an interface */
        if (ipv6_chk_same_addr(addr, idev->dev)) {
                ADBG(("ipv6_add_addr: already assigned\n"));
                err = -EEXIST;
                goto out;
        }
 
        ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 
        if (ifa == NULL) {
                ADBG(("ipv6_add_addr: malloc failed\n"));
                err = -ENOBUFS;
                goto out;
        }
 
        rt = addrconf_dst_alloc(idev, addr, 0);
        if (IS_ERR(rt)) {
                err = PTR_ERR(rt);
                goto out;
        }
 
        ipv6_addr_copy(&ifa->addr, addr);
 
        spin_lock_init(&ifa->lock);
        init_timer(&ifa->timer);
        ifa->timer.data = (unsigned long) ifa;
        ifa->scope = scope;
        ifa->prefix_len = pfxlen;
        ifa->flags = flags | IFA_F_TENTATIVE;
        ifa->cstamp = ifa->tstamp = jiffies;
 
        ifa->rt = rt;
 
        /*
         * part one of RFC 4429, section 3.3
         * We should not configure an address as
         * optimistic if we do not yet know the link
         * layer address of our nexhop router
         */
 
        if (rt->rt6i_nexthop == NULL)
                ifa->flags &= ~IFA_F_OPTIMISTIC;
 
        ifa->idev = idev;
        in6_dev_hold(idev);
        /* For caller */
        in6_ifa_hold(ifa);
 
        /* Add to big hash table */
        hash = ipv6_addr_hash(addr);
 
        ifa->lst_next = inet6_addr_lst[hash];
        inet6_addr_lst[hash] = ifa;
        in6_ifa_hold(ifa);
        write_unlock(&addrconf_hash_lock);
 
        write_lock(&idev->lock);
        /* Add to inet6_dev unicast addr list. */
        ipv6_link_dev_addr(idev, ifa);
 
#ifdef CONFIG_IPV6_PRIVACY
        if (ifa->flags&IFA_F_TEMPORARY) {
                ifa->tmp_next = idev->tempaddr_list;
                idev->tempaddr_list = ifa;
                in6_ifa_hold(ifa);
        }
#endif
 
        in6_ifa_hold(ifa);
        write_unlock(&idev->lock);
out2:
        rcu_read_unlock_bh();
 
        if (likely(err == 0))
                atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
        else {
                kfree(ifa);
                ifa = ERR_PTR(err);
        }
 
        return ifa;
out:
        write_unlock(&addrconf_hash_lock);
        goto out2;
}
 
/* This function wants to get referenced ifp and releases it before return */
 
static void ipv6_del_addr(struct inet6_ifaddr *ifp)
{
        struct inet6_ifaddr *ifa, **ifap;
        struct inet6_dev *idev = ifp->idev;
        int hash;
        int deleted = 0, onlink = 0;
        unsigned long expires = jiffies;
 
        hash = ipv6_addr_hash(&ifp->addr);
 
        ifp->dead = 1;
 
        write_lock_bh(&addrconf_hash_lock);
        for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
             ifap = &ifa->lst_next) {
                if (ifa == ifp) {
                        *ifap = ifa->lst_next;
                        __in6_ifa_put(ifp);
                        ifa->lst_next = NULL;
                        break;
                }
        }
        write_unlock_bh(&addrconf_hash_lock);
 
        write_lock_bh(&idev->lock);
#ifdef CONFIG_IPV6_PRIVACY
        if (ifp->flags&IFA_F_TEMPORARY) {
                for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
                     ifap = &ifa->tmp_next) {
                        if (ifa == ifp) {
                                *ifap = ifa->tmp_next;
                                if (ifp->ifpub) {
                                        in6_ifa_put(ifp->ifpub);
                                        ifp->ifpub = NULL;
                                }
                                __in6_ifa_put(ifp);
                                ifa->tmp_next = NULL;
                                break;
                        }
                }
        }
#endif
 
        for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
                if (ifa == ifp) {
                        *ifap = ifa->if_next;
                        __in6_ifa_put(ifp);
                        ifa->if_next = NULL;
                        if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
                                break;
                        deleted = 1;
                        continue;
                } else if (ifp->flags & IFA_F_PERMANENT) {
                        if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
                                              ifp->prefix_len)) {
                                if (ifa->flags & IFA_F_PERMANENT) {
                                        onlink = 1;
                                        if (deleted)
                                                break;
                                } else {
                                        unsigned long lifetime;
 
                                        if (!onlink)
                                                onlink = -1;
 
                                        spin_lock(&ifa->lock);
                                        lifetime = min_t(unsigned long,
                                                         ifa->valid_lft, 0x7fffffffUL/HZ);
                                        if (time_before(expires,
                                                        ifa->tstamp + lifetime * HZ))
                                                expires = ifa->tstamp + lifetime * HZ;
                                        spin_unlock(&ifa->lock);
                                }
                        }
                }
                ifap = &ifa->if_next;
        }
        write_unlock_bh(&idev->lock);
 
        ipv6_ifa_notify(RTM_DELADDR, ifp);
 
        atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 
        addrconf_del_timer(ifp);
 
        /*
         * Purge or update corresponding prefix
         *
         * 1) we don't purge prefix here if address was not permanent.
         *    prefix is managed by its own lifetime.
         * 2) if there're no addresses, delete prefix.
         * 3) if there're still other permanent address(es),
         *    corresponding prefix is still permanent.
         * 4) otherwise, update prefix lifetime to the
         *    longest valid lifetime among the corresponding
         *    addresses on the device.
         *    Note: subsequent RA will update lifetime.
         *
         * --yoshfuji
         */
        if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
                struct in6_addr prefix;
                struct rt6_info *rt;
 
                ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
                rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 
                if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
                        if (onlink == 0) {
                                ip6_del_rt(rt);
                                rt = NULL;
                        } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
                                rt->rt6i_expires = expires;
                                rt->rt6i_flags |= RTF_EXPIRES;
                        }
                }
                dst_release(&rt->u.dst);
        }
 
        in6_ifa_put(ifp);
}
 
#ifdef CONFIG_IPV6_PRIVACY
static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
{
        struct inet6_dev *idev = ifp->idev;
        struct in6_addr addr, *tmpaddr;
        unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
        int tmp_plen;
        int ret = 0;
        int max_addresses;
        u32 addr_flags;
 
        write_lock(&idev->lock);
        if (ift) {
                spin_lock_bh(&ift->lock);
                memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
                spin_unlock_bh(&ift->lock);
                tmpaddr = &addr;
        } else {
                tmpaddr = NULL;
        }
retry:
        in6_dev_hold(idev);
        if (idev->cnf.use_tempaddr <= 0) {
                write_unlock(&idev->lock);
                printk(KERN_INFO
                        "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
                in6_dev_put(idev);
                ret = -1;
                goto out;
        }
        spin_lock_bh(&ifp->lock);
        if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
                idev->cnf.use_tempaddr = -1;    /*XXX*/
                spin_unlock_bh(&ifp->lock);
                write_unlock(&idev->lock);
                printk(KERN_WARNING
                        "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
                in6_dev_put(idev);
                ret = -1;
                goto out;
        }
        in6_ifa_hold(ifp);
        memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
        if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
                spin_unlock_bh(&ifp->lock);
                write_unlock(&idev->lock);
                printk(KERN_WARNING
                        "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
                in6_ifa_put(ifp);
                in6_dev_put(idev);
                ret = -1;
                goto out;
        }
        memcpy(&addr.s6_addr[8], idev->rndid, 8);
        tmp_valid_lft = min_t(__u32,
                              ifp->valid_lft,
                              idev->cnf.temp_valid_lft);
        tmp_prefered_lft = min_t(__u32,
                                 ifp->prefered_lft,
                                 idev->cnf.temp_prefered_lft - desync_factor / HZ);
        tmp_plen = ifp->prefix_len;
        max_addresses = idev->cnf.max_addresses;
        tmp_cstamp = ifp->cstamp;
        tmp_tstamp = ifp->tstamp;
        spin_unlock_bh(&ifp->lock);
 
        write_unlock(&idev->lock);
 
        addr_flags = IFA_F_TEMPORARY;
        /* set in addrconf_prefix_rcv() */
        if (ifp->flags & IFA_F_OPTIMISTIC)
                addr_flags |= IFA_F_OPTIMISTIC;
 
        ift = !max_addresses ||
              ipv6_count_addresses(idev) < max_addresses ?
                ipv6_add_addr(idev, &addr, tmp_plen,
                              ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
                              addr_flags) : NULL;
        if (!ift || IS_ERR(ift)) {
                in6_ifa_put(ifp);
                in6_dev_put(idev);
                printk(KERN_INFO
                        "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
                tmpaddr = &addr;
                write_lock(&idev->lock);
                goto retry;
        }
 
        spin_lock_bh(&ift->lock);
        ift->ifpub = ifp;
        ift->valid_lft = tmp_valid_lft;
        ift->prefered_lft = tmp_prefered_lft;
        ift->cstamp = tmp_cstamp;
        ift->tstamp = tmp_tstamp;
        spin_unlock_bh(&ift->lock);
 
        addrconf_dad_start(ift, 0);
        in6_ifa_put(ift);
        in6_dev_put(idev);
out:
        return ret;
}
#endif
 
/*
 *      Choose an appropriate source address (RFC3484)
 */
struct ipv6_saddr_score {
        int             addr_type;
        unsigned int    attrs;
        int             matchlen;
        int             scope;
        unsigned int    rule;
};
 
#define IPV6_SADDR_SCORE_LOCAL          0x0001
#define IPV6_SADDR_SCORE_PREFERRED      0x0004
#define IPV6_SADDR_SCORE_HOA            0x0008
#define IPV6_SADDR_SCORE_OIF            0x0010
#define IPV6_SADDR_SCORE_LABEL          0x0020
#define IPV6_SADDR_SCORE_PRIVACY        0x0040
 
static inline int ipv6_saddr_preferred(int type)
{
        if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
                    IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
                return 1;
        return 0;
}
 
/* static matching label */
static inline int ipv6_saddr_label(const struct in6_addr *addr, int type)
{
 /*
  *     prefix (longest match)  label
  *     -----------------------------
  *     ::1/128                 0
  *     ::/0                    1
  *     2002::/16               2
  *     ::/96                   3
  *     ::ffff:0:0/96           4
  *     fc00::/7                5
  *     2001::/32               6
  */
        if (type & IPV6_ADDR_LOOPBACK)
                return 0;
        else if (type & IPV6_ADDR_COMPATv4)
                return 3;
        else if (type & IPV6_ADDR_MAPPED)
                return 4;
        else if (addr->s6_addr32[0] == htonl(0x20010000))
                return 6;
        else if (addr->s6_addr16[0] == htons(0x2002))
                return 2;
        else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
                return 5;
        return 1;
}
 
int ipv6_dev_get_saddr(struct net_device *daddr_dev,
                       struct in6_addr *daddr, struct in6_addr *saddr)
{
        struct ipv6_saddr_score hiscore;
        struct inet6_ifaddr *ifa_result = NULL;
        int daddr_type = __ipv6_addr_type(daddr);
        int daddr_scope = __ipv6_addr_src_scope(daddr_type);
        u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
        struct net_device *dev;
 
        memset(&hiscore, 0, sizeof(hiscore));
 
        read_lock(&dev_base_lock);
        rcu_read_lock();
 
        for_each_netdev(&init_net, dev) {
                struct inet6_dev *idev;
                struct inet6_ifaddr *ifa;
 
                /* Rule 0: Candidate Source Address (section 4)
                 *  - multicast and link-local destination address,
                 *    the set of candidate source address MUST only
                 *    include addresses assigned to interfaces
                 *    belonging to the same link as the outgoing
                 *    interface.
                 * (- For site-local destination addresses, the
                 *    set of candidate source addresses MUST only
                 *    include addresses assigned to interfaces
                 *    belonging to the same site as the outgoing
                 *    interface.)
                 */
                if ((daddr_type & IPV6_ADDR_MULTICAST ||
                     daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
                    daddr_dev && dev != daddr_dev)
                        continue;
 
                idev = __in6_dev_get(dev);
                if (!idev)
                        continue;
 
                read_lock_bh(&idev->lock);
                for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
                        struct ipv6_saddr_score score;
 
                        score.addr_type = __ipv6_addr_type(&ifa->addr);
 
                        /* Rule 0:
                         * - Tentative Address (RFC2462 section 5.4)
                         *  - A tentative address is not considered
                         *    "assigned to an interface" in the traditional
                         *    sense, unless it is also flagged as optimistic.
                         * - Candidate Source Address (section 4)
                         *  - In any case, anycast addresses, multicast
                         *    addresses, and the unspecified address MUST
                         *    NOT be included in a candidate set.
                         */
                        if ((ifa->flags & IFA_F_TENTATIVE) &&
                            (!(ifa->flags & IFA_F_OPTIMISTIC)))
                                continue;
                        if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
                                     score.addr_type & IPV6_ADDR_MULTICAST)) {
                                LIMIT_NETDEBUG(KERN_DEBUG
                                               "ADDRCONF: unspecified / multicast address "
                                               "assigned as unicast address on %s",
                                               dev->name);
                                continue;
                        }
 
                        score.attrs = 0;
                        score.matchlen = 0;
                        score.scope = 0;
                        score.rule = 0;
 
                        if (ifa_result == NULL) {
                                /* record it if the first available entry */
                                goto record_it;
                        }
 
                        /* Rule 1: Prefer same address */
                        if (hiscore.rule < 1) {
                                if (ipv6_addr_equal(&ifa_result->addr, daddr))
                                        hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
                                hiscore.rule++;
                        }
                        if (ipv6_addr_equal(&ifa->addr, daddr)) {
                                score.attrs |= IPV6_SADDR_SCORE_LOCAL;
                                if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
                                        score.rule = 1;
                                        goto record_it;
                                }
                        } else {
                                if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
                                        continue;
                        }
 
                        /* Rule 2: Prefer appropriate scope */
                        if (hiscore.rule < 2) {
                                hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
                                hiscore.rule++;
                        }
                        score.scope = __ipv6_addr_src_scope(score.addr_type);
                        if (hiscore.scope < score.scope) {
                                if (hiscore.scope < daddr_scope) {
                                        score.rule = 2;
                                        goto record_it;
                                } else
                                        continue;
                        } else if (score.scope < hiscore.scope) {
                                if (score.scope < daddr_scope)
                                        break; /* addresses sorted by scope */
                                else {
                                        score.rule = 2;
                                        goto record_it;
                                }
                        }
 
                        /* Rule 3: Avoid deprecated and optimistic addresses */
                        if (hiscore.rule < 3) {
                                if (ipv6_saddr_preferred(hiscore.addr_type) ||
                                   (((ifa_result->flags &
                                    (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
                                        hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
                                hiscore.rule++;
                        }
                        if (ipv6_saddr_preferred(score.addr_type) ||
                           (((ifa->flags &
                            (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
                                score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
                                if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
                                        score.rule = 3;
                                        goto record_it;
                                }
                        } else {
                                if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
                                        continue;
                        }
 
                        /* Rule 4: Prefer home address */
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
                        if (hiscore.rule < 4) {
                                if (ifa_result->flags & IFA_F_HOMEADDRESS)
                                        hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
                                hiscore.rule++;
                        }
                        if (ifa->flags & IFA_F_HOMEADDRESS) {
                                score.attrs |= IPV6_SADDR_SCORE_HOA;
                                if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
                                        score.rule = 4;
                                        goto record_it;
                                }
                        } else {
                                if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
                                        continue;
                        }
#else
                        if (hiscore.rule < 4)
                                hiscore.rule++;
#endif
 
                        /* Rule 5: Prefer outgoing interface */
                        if (hiscore.rule < 5) {
                                if (daddr_dev == NULL ||
                                    daddr_dev == ifa_result->idev->dev)
                                        hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
                                hiscore.rule++;
                        }
                        if (daddr_dev == NULL ||
                            daddr_dev == ifa->idev->dev) {
                                score.attrs |= IPV6_SADDR_SCORE_OIF;
                                if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
                                        score.rule = 5;
                                        goto record_it;
                                }
                        } else {
                                if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
                                        continue;
                        }
 
                        /* Rule 6: Prefer matching label */
                        if (hiscore.rule < 6) {
                                if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
                                        hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
                                hiscore.rule++;
                        }
                        if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
                                score.attrs |= IPV6_SADDR_SCORE_LABEL;
                                if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
                                        score.rule = 6;
                                        goto record_it;
                                }
                        } else {
                                if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
                                        continue;
                        }
 
#ifdef CONFIG_IPV6_PRIVACY
                        /* Rule 7: Prefer public address
                         * Note: prefer temprary address if use_tempaddr >= 2
                         */
                        if (hiscore.rule < 7) {
                                if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
                                    (ifa_result->idev->cnf.use_tempaddr >= 2))
                                        hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
                                hiscore.rule++;
                        }
                        if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
                            (ifa->idev->cnf.use_tempaddr >= 2)) {
                                score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
                                if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
                                        score.rule = 7;
                                        goto record_it;
                                }
                        } else {
                                if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
                                        continue;
                        }
#else
                        if (hiscore.rule < 7)
                                hiscore.rule++;
#endif
                        /* Rule 8: Use longest matching prefix */
                        if (hiscore.rule < 8) {
                                hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
                                hiscore.rule++;
                        }
                        score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
                        if (score.matchlen > hiscore.matchlen) {
                                score.rule = 8;
                                goto record_it;
                        }
#if 0
                        else if (score.matchlen < hiscore.matchlen)
                                continue;
#endif
 
                        /* Final Rule: choose first available one */
                        continue;
record_it:
                        if (ifa_result)
                                in6_ifa_put(ifa_result);
                        in6_ifa_hold(ifa);
                        ifa_result = ifa;
                        hiscore = score;
                }
                read_unlock_bh(&idev->lock);
        }
        rcu_read_unlock();
        read_unlock(&dev_base_lock);
 
        if (!ifa_result)
                return -EADDRNOTAVAIL;
 
        ipv6_addr_copy(saddr, &ifa_result->addr);
        in6_ifa_put(ifa_result);
        return 0;
}
 
 
int ipv6_get_saddr(struct dst_entry *dst,
                   struct in6_addr *daddr, struct in6_addr *saddr)
{
        return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
}
 
EXPORT_SYMBOL(ipv6_get_saddr);
 
int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
                    unsigned char banned_flags)
{
        struct inet6_dev *idev;
        int err = -EADDRNOTAVAIL;
 
        rcu_read_lock();
        if ((idev = __in6_dev_get(dev)) != NULL) {
                struct inet6_ifaddr *ifp;
 
                read_lock_bh(&idev->lock);
                for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
                        if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
                                ipv6_addr_copy(addr, &ifp->addr);
                                err = 0;
                                break;
                        }
                }
                read_unlock_bh(&idev->lock);
        }
        rcu_read_unlock();
        return err;
}
 
static int ipv6_count_addresses(struct inet6_dev *idev)
{
        int cnt = 0;
        struct inet6_ifaddr *ifp;
 
        read_lock_bh(&idev->lock);
        for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
                cnt++;
        read_unlock_bh(&idev->lock);
        return cnt;
}
 
int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
{
        struct inet6_ifaddr * ifp;
        u8 hash = ipv6_addr_hash(addr);
 
        read_lock_bh(&addrconf_hash_lock);
        for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
                if (ipv6_addr_equal(&ifp->addr, addr) &&
                    !(ifp->flags&IFA_F_TENTATIVE)) {
                        if (dev == NULL || ifp->idev->dev == dev ||
                            !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
                                break;
                }
        }
        read_unlock_bh(&addrconf_hash_lock);
        return ifp != NULL;
}
 
EXPORT_SYMBOL(ipv6_chk_addr);
 
static
int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
{
        struct inet6_ifaddr * ifp;
        u8 hash = ipv6_addr_hash(addr);
 
        for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
                if (ipv6_addr_equal(&ifp->addr, addr)) {
                        if (dev == NULL || ifp->idev->dev == dev)
                                break;
                }
        }
        return ifp != NULL;
}
 
struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
{
        struct inet6_ifaddr * ifp;
        u8 hash = ipv6_addr_hash(addr);
 
        read_lock_bh(&addrconf_hash_lock);
        for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
                if (ipv6_addr_equal(&ifp->addr, addr)) {
                        if (dev == NULL || ifp->idev->dev == dev ||
                            !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
                                in6_ifa_hold(ifp);
                                break;
                        }
                }
        }
        read_unlock_bh(&addrconf_hash_lock);
 
        return ifp;
}
 
int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
{
        const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
        const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
        __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
        __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
        int sk_ipv6only = ipv6_only_sock(sk);
        int sk2_ipv6only = inet_v6_ipv6only(sk2);
        int addr_type = ipv6_addr_type(sk_rcv_saddr6);
        int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
 
        if (!sk2_rcv_saddr && !sk_ipv6only)
                return 1;
 
        if (addr_type2 == IPV6_ADDR_ANY &&
            !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
                return 1;
 
        if (addr_type == IPV6_ADDR_ANY &&
            !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
                return 1;
 
        if (sk2_rcv_saddr6 &&
            ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
                return 1;
 
        if (addr_type == IPV6_ADDR_MAPPED &&
            !sk2_ipv6only &&
            (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
                return 1;
 
        return 0;
}
 
/* Gets referenced address, destroys ifaddr */
 
static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
{
        if (ifp->flags&IFA_F_PERMANENT) {
                spin_lock_bh(&ifp->lock);
                addrconf_del_timer(ifp);
                ifp->flags |= IFA_F_TENTATIVE;
                spin_unlock_bh(&ifp->lock);
                in6_ifa_put(ifp);
#ifdef CONFIG_IPV6_PRIVACY
        } else if (ifp->flags&IFA_F_TEMPORARY) {
                struct inet6_ifaddr *ifpub;
                spin_lock_bh(&ifp->lock);
                ifpub = ifp->ifpub;
                if (ifpub) {
                        in6_ifa_hold(ifpub);
                        spin_unlock_bh(&ifp->lock);
                        ipv6_create_tempaddr(ifpub, ifp);
                        in6_ifa_put(ifpub);
                } else {
                        spin_unlock_bh(&ifp->lock);
                }
                ipv6_del_addr(ifp);
#endif
        } else
                ipv6_del_addr(ifp);
}
 
void addrconf_dad_failure(struct inet6_ifaddr *ifp)
{
        if (net_ratelimit())
                printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
        addrconf_dad_stop(ifp);
}
 
/* Join to solicited addr multicast group. */
 
void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
{
        struct in6_addr maddr;
 
        if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
                return;
 
        addrconf_addr_solict_mult(addr, &maddr);
        ipv6_dev_mc_inc(dev, &maddr);
}
 
void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
{
        struct in6_addr maddr;
 
        if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
                return;
 
        addrconf_addr_solict_mult(addr, &maddr);
        __ipv6_dev_mc_dec(idev, &maddr);
}
 
static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
{
        struct in6_addr addr;
        ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
        if (ipv6_addr_any(&addr))
                return;
        ipv6_dev_ac_inc(ifp->idev->dev, &addr);
}
 
static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
{
        struct in6_addr addr;
        ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
        if (ipv6_addr_any(&addr))
                return;
        __ipv6_dev_ac_dec(ifp->idev, &addr);
}
 
static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
{
        if (dev->addr_len != ETH_ALEN)
                return -1;
        memcpy(eui, dev->dev_addr, 3);
        memcpy(eui + 5, dev->dev_addr + 3, 3);
 
        /*
         * The zSeries OSA network cards can be shared among various
         * OS instances, but the OSA cards have only one MAC address.
         * This leads to duplicate address conflicts in conjunction
         * with IPv6 if more than one instance uses the same card.
         *
         * The driver for these cards can deliver a unique 16-bit
         * identifier for each instance sharing the same card.  It is
         * placed instead of 0xFFFE in the interface identifier.  The
         * "u" bit of the interface identifier is not inverted in this
         * case.  Hence the resulting interface identifier has local
         * scope according to RFC2373.
         */
        if (dev->dev_id) {
                eui[3] = (dev->dev_id >> 8) & 0xFF;
                eui[4] = dev->dev_id & 0xFF;
        } else {
                eui[3] = 0xFF;
                eui[4] = 0xFE;
                eui[0] ^= 2;
        }
        return 0;
}
 
static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
{
        /* XXX: inherit EUI-64 from other interface -- yoshfuji */
        if (dev->addr_len != ARCNET_ALEN)
                return -1;
        memset(eui, 0, 7);
        eui[7] = *(u8*)dev->dev_addr;
        return 0;
}
 
static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
{
        if (dev->addr_len != INFINIBAND_ALEN)
                return -1;
        memcpy(eui, dev->dev_addr + 12, 8);
        eui[0] |= 2;
        return 0;
}
 
static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
{
        switch (dev->type) {
        case ARPHRD_ETHER:
        case ARPHRD_FDDI:
        case ARPHRD_IEEE802_TR:
                return addrconf_ifid_eui48(eui, dev);
        case ARPHRD_ARCNET:
                return addrconf_ifid_arcnet(eui, dev);
        case ARPHRD_INFINIBAND:
                return addrconf_ifid_infiniband(eui, dev);
        }
        return -1;
}
 
static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
{
        int err = -1;
        struct inet6_ifaddr *ifp;
 
        read_lock_bh(&idev->lock);
        for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
                if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
                        memcpy(eui, ifp->addr.s6_addr+8, 8);
                        err = 0;
                        break;
                }
        }
        read_unlock_bh(&idev->lock);
        return err;
}
 
#ifdef CONFIG_IPV6_PRIVACY
/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
static int __ipv6_regen_rndid(struct inet6_dev *idev)
{
regen:
        get_random_bytes(idev->rndid, sizeof(idev->rndid));
        idev->rndid[0] &= ~0x02;
 
        /*
         * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
         * check if generated address is not inappropriate
         *
         *  - Reserved subnet anycast (RFC 2526)
         *      11111101 11....11 1xxxxxxx
         *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
         *      00-00-5E-FE-xx-xx-xx-xx
         *  - value 0
         *  - XXX: already assigned to an address on the device
         */
        if (idev->rndid[0] == 0xfd &&
            (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
            (idev->rndid[7]&0x80))
                goto regen;
        if ((idev->rndid[0]|idev->rndid[1]) == 0) {
                if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
                        goto regen;
                if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
                        goto regen;
        }
 
        return 0;
}
 
static void ipv6_regen_rndid(unsigned long data)
{
        struct inet6_dev *idev = (struct inet6_dev *) data;
        unsigned long expires;
 
        rcu_read_lock_bh();
        write_lock_bh(&idev->lock);
 
        if (idev->dead)
                goto out;
 
        if (__ipv6_regen_rndid(idev) < 0)
                goto out;
 
        expires = jiffies +
                idev->cnf.temp_prefered_lft * HZ -
                idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
        if (time_before(expires, jiffies)) {
                printk(KERN_WARNING
                        "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
                        idev->dev->name);
                goto out;
        }
 
        if (!mod_timer(&idev->regen_timer, expires))
                in6_dev_hold(idev);
 
out:
        write_unlock_bh(&idev->lock);
        rcu_read_unlock_bh();
        in6_dev_put(idev);
}
 
static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
        int ret = 0;
 
        if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
                ret = __ipv6_regen_rndid(idev);
        return ret;
}
#endif
 
/*
 *      Add prefix route.
 */
 
static void
addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
                      unsigned long expires, u32 flags)
{
        struct fib6_config cfg = {
                .fc_table = RT6_TABLE_PREFIX,
                .fc_metric = IP6_RT_PRIO_ADDRCONF,
                .fc_ifindex = dev->ifindex,
                .fc_expires = expires,
                .fc_dst_len = plen,
                .fc_flags = RTF_UP | flags,
        };
 
        ipv6_addr_copy(&cfg.fc_dst, pfx);
 
        /* Prevent useless cloning on PtP SIT.
           This thing is done here expecting that the whole
           class of non-broadcast devices need not cloning.
         */
#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
        if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
                cfg.fc_flags |= RTF_NONEXTHOP;
#endif
 
        ip6_route_add(&cfg);
}
 
/* Create "default" multicast route to the interface */
 
static void addrconf_add_mroute(struct net_device *dev)
{
        struct fib6_config cfg = {
                .fc_table = RT6_TABLE_LOCAL,
                .fc_metric = IP6_RT_PRIO_ADDRCONF,
                .fc_ifindex = dev->ifindex,
                .fc_dst_len = 8,
                .fc_flags = RTF_UP,
        };
 
        ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
 
        ip6_route_add(&cfg);
}
 
#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
static void sit_route_add(struct net_device *dev)
{
        struct fib6_config cfg = {
                .fc_table = RT6_TABLE_MAIN,
                .fc_metric = IP6_RT_PRIO_ADDRCONF,
                .fc_ifindex = dev->ifindex,
                .fc_dst_len = 96,
                .fc_flags = RTF_UP | RTF_NONEXTHOP,
        };
 
        /* prefix length - 96 bits "::d.d.d.d" */
        ip6_route_add(&cfg);
}
#endif
 
static void addrconf_add_lroute(struct net_device *dev)
{
        struct in6_addr addr;
 
        ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
        addrconf_prefix_route(&addr, 64, dev, 0, 0);
}
 
static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
{
        struct inet6_dev *idev;
 
        ASSERT_RTNL();
 
        if ((idev = ipv6_find_idev(dev)) == NULL)
                return NULL;
 
        /* Add default multicast route */
        addrconf_add_mroute(dev);
 
        /* Add link local route */
        addrconf_add_lroute(dev);
        return idev;
}
 
void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
{
        struct prefix_info *pinfo;
        __u32 valid_lft;
        __u32 prefered_lft;
        int addr_type;
        unsigned long rt_expires;
        struct inet6_dev *in6_dev;
 
        pinfo = (struct prefix_info *) opt;
 
        if (len < sizeof(struct prefix_info)) {
                ADBG(("addrconf: prefix option too short\n"));
                return;
        }
 
        /*
         *      Validation checks ([ADDRCONF], page 19)
         */
 
        addr_type = ipv6_addr_type(&pinfo->prefix);
 
        if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
                return;
 
        valid_lft = ntohl(pinfo->valid);
        prefered_lft = ntohl(pinfo->prefered);
 
        if (prefered_lft > valid_lft) {
                if (net_ratelimit())
                        printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
                return;
        }
 
        in6_dev = in6_dev_get(dev);
 
        if (in6_dev == NULL) {
                if (net_ratelimit())
                        printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
                return;
        }
 
        /*
         *      Two things going on here:
         *      1) Add routes for on-link prefixes
         *      2) Configure prefixes with the auto flag set
         */
 
        /* Avoid arithmetic overflow. Really, we could
           save rt_expires in seconds, likely valid_lft,
           but it would require division in fib gc, that it
           not good.
         */
        if (valid_lft >= 0x7FFFFFFF/HZ)
                rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
        else
                rt_expires = valid_lft * HZ;
 
        /*
         * We convert this (in jiffies) to clock_t later.
         * Avoid arithmetic overflow there as well.
         * Overflow can happen only if HZ < USER_HZ.
         */
        if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
                rt_expires = 0x7FFFFFFF / USER_HZ;
 
        if (pinfo->onlink) {
                struct rt6_info *rt;
                rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
 
                if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
                        if (rt->rt6i_flags&RTF_EXPIRES) {
                                if (valid_lft == 0) {
                                        ip6_del_rt(rt);
                                        rt = NULL;
                                } else {
                                        rt->rt6i_expires = jiffies + rt_expires;
                                }
                        }
                } else if (valid_lft) {
                        addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
                                              dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
                }
                if (rt)
                        dst_release(&rt->u.dst);
        }
 
        /* Try to figure out our local address for this prefix */
 
        if (pinfo->autoconf && in6_dev->cnf.autoconf) {
                struct inet6_ifaddr * ifp;
                struct in6_addr addr;
                int create = 0, update_lft = 0;
 
                if (pinfo->prefix_len == 64) {
                        memcpy(&addr, &pinfo->prefix, 8);
                        if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
                            ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
                                in6_dev_put(in6_dev);
                                return;
                        }
                        goto ok;
                }
                if (net_ratelimit())
                        printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
                               pinfo->prefix_len);
                in6_dev_put(in6_dev);
                return;
 
ok:
 
                ifp = ipv6_get_ifaddr(&addr, dev, 1);
 
                if (ifp == NULL && valid_lft) {
                        int max_addresses = in6_dev->cnf.max_addresses;
                        u32 addr_flags = 0;
 
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
                        if (in6_dev->cnf.optimistic_dad &&
                            !ipv6_devconf.forwarding)
                                addr_flags = IFA_F_OPTIMISTIC;
#endif
 
                        /* Do not allow to create too much of autoconfigured
                         * addresses; this would be too easy way to crash kernel.
                         */
                        if (!max_addresses ||
                            ipv6_count_addresses(in6_dev) < max_addresses)
                                ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
                                                    addr_type&IPV6_ADDR_SCOPE_MASK,
                                                    addr_flags);
 
                        if (!ifp || IS_ERR(ifp)) {
                                in6_dev_put(in6_dev);
                                return;
                        }
 
                        update_lft = create = 1;
                        ifp->cstamp = jiffies;
                        addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
                }
 
                if (ifp) {
                        int flags;
                        unsigned long now;
#ifdef CONFIG_IPV6_PRIVACY
                        struct inet6_ifaddr *ift;
#endif
                        u32 stored_lft;
 
                        /* update lifetime (RFC2462 5.5.3 e) */
                        spin_lock(&ifp->lock);
                        now = jiffies;
                        if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
                                stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
                        else
                                stored_lft = 0;
                        if (!update_lft && stored_lft) {
                                if (valid_lft > MIN_VALID_LIFETIME ||
                                    valid_lft > stored_lft)
                                        update_lft = 1;
                                else if (stored_lft <= MIN_VALID_LIFETIME) {
                                        /* valid_lft <= stored_lft is always true */
                                        /* XXX: IPsec */
                                        update_lft = 0;
                                } else {
                                        valid_lft = MIN_VALID_LIFETIME;
                                        if (valid_lft < prefered_lft)
                                                prefered_lft = valid_lft;
                                        update_lft = 1;
                                }
                        }
 
                        if (update_lft) {
                                ifp->valid_lft = valid_lft;
                                ifp->prefered_lft = prefered_lft;
                                ifp->tstamp = now;
                                flags = ifp->flags;
                                ifp->flags &= ~IFA_F_DEPRECATED;
                                spin_unlock(&ifp->lock);
 
                                if (!(flags&IFA_F_TENTATIVE))
                                        ipv6_ifa_notify(0, ifp);
                        } else
                                spin_unlock(&ifp->lock);
 
#ifdef CONFIG_IPV6_PRIVACY
                        read_lock_bh(&in6_dev->lock);
                        /* update all temporary addresses in the list */
                        for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
                                /*
                                 * When adjusting the lifetimes of an existing
                                 * temporary address, only lower the lifetimes.
                                 * Implementations must not increase the
                                 * lifetimes of an existing temporary address
                                 * when processing a Prefix Information Option.
                                 */
                                spin_lock(&ift->lock);
                                flags = ift->flags;
                                if (ift->valid_lft > valid_lft &&
                                    ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
                                        ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
                                if (ift->prefered_lft > prefered_lft &&
                                    ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
                                        ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
                                spin_unlock(&ift->lock);
                                if (!(flags&IFA_F_TENTATIVE))
                                        ipv6_ifa_notify(0, ift);
                        }
 
                        if (create && in6_dev->cnf.use_tempaddr > 0) {
                                /*
                                 * When a new public address is created as described in [ADDRCONF],
                                 * also create a new temporary address.
                                 */
                                read_unlock_bh(&in6_dev->lock);
                                ipv6_create_tempaddr(ifp, NULL);
                        } else {
                                read_unlock_bh(&in6_dev->lock);
                        }
#endif
                        in6_ifa_put(ifp);
                        addrconf_verify(0);
                }
        }
        inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
        in6_dev_put(in6_dev);
}
 
/*
 *      Set destination address.
 *      Special case for SIT interfaces where we create a new "virtual"
 *      device.
 */
int addrconf_set_dstaddr(void __user *arg)
{
        struct in6_ifreq ireq;
        struct net_device *dev;
        int err = -EINVAL;
 
        rtnl_lock();
 
        err = -EFAULT;
        if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
                goto err_exit;
 
        dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
 
        err = -ENODEV;
        if (dev == NULL)
                goto err_exit;
 
#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
        if (dev->type == ARPHRD_SIT) {
                struct ifreq ifr;
                mm_segment_t    oldfs;
                struct ip_tunnel_parm p;
 
                err = -EADDRNOTAVAIL;
                if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
                        goto err_exit;
 
                memset(&p, 0, sizeof(p));
                p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
                p.iph.saddr = 0;
                p.iph.version = 4;
                p.iph.ihl = 5;
                p.iph.protocol = IPPROTO_IPV6;
                p.iph.ttl = 64;
                ifr.ifr_ifru.ifru_data = (void __user *)&p;
 
                oldfs = get_fs(); set_fs(KERNEL_DS);
                err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
                set_fs(oldfs);
 
                if (err == 0) {
                        err = -ENOBUFS;
                        if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
                                goto err_exit;
                        err = dev_open(dev);
                }
        }
#endif
 
err_exit:
        rtnl_unlock();
        return err;
}
 
/*
 *      Manual configuration of address on an interface
 */
static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
                          __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
{
        struct inet6_ifaddr *ifp;
        struct inet6_dev *idev;
        struct net_device *dev;
        int scope;
        u32 flags = RTF_EXPIRES;
 
        ASSERT_RTNL();
 
        /* check the lifetime */
        if (!valid_lft || prefered_lft > valid_lft)
                return -EINVAL;
 
        if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
                return -ENODEV;
 
        if ((idev = addrconf_add_dev(dev)) == NULL)
                return -ENOBUFS;
 
        scope = ipv6_addr_scope(pfx);
 
        if (valid_lft == INFINITY_LIFE_TIME) {
                ifa_flags |= IFA_F_PERMANENT;
                flags = 0;
        } else if (valid_lft >= 0x7FFFFFFF/HZ)
                valid_lft = 0x7FFFFFFF/HZ;
 
        if (prefered_lft == 0)
                ifa_flags |= IFA_F_DEPRECATED;
        else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
                 (prefered_lft != INFINITY_LIFE_TIME))
                prefered_lft = 0x7FFFFFFF/HZ;
 
        ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
 
        if (!IS_ERR(ifp)) {
                spin_lock_bh(&ifp->lock);
                ifp->valid_lft = valid_lft;
                ifp->prefered_lft = prefered_lft;
                ifp->tstamp = jiffies;
                spin_unlock_bh(&ifp->lock);
 
                addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
                                      jiffies_to_clock_t(valid_lft * HZ), flags);
                /*
                 * Note that section 3.1 of RFC 4429 indicates
                 * that the Optimistic flag should not be set for
                 * manually configured addresses
                 */
                addrconf_dad_start(ifp, 0);
                in6_ifa_put(ifp);
                addrconf_verify(0);
                return 0;
        }
 
        return PTR_ERR(ifp);
}
 
static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
{
        struct inet6_ifaddr *ifp;
        struct inet6_dev *idev;
        struct net_device *dev;
 
        if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
                return -ENODEV;
 
        if ((idev = __in6_dev_get(dev)) == NULL)
                return -ENXIO;
 
        read_lock_bh(&idev->lock);
        for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
                if (ifp->prefix_len == plen &&
                    ipv6_addr_equal(pfx, &ifp->addr)) {
                        in6_ifa_hold(ifp);
                        read_unlock_bh(&idev->lock);
 
                        ipv6_del_addr(ifp);
 
                        /* If the last address is deleted administratively,
                           disable IPv6 on this interface.
                         */
                        if (idev->addr_list == NULL)
                                addrconf_ifdown(idev->dev, 1);
                        return 0;
                }
        }
        read_unlock_bh(&idev->lock);
        return -EADDRNOTAVAIL;
}
 
 
int addrconf_add_ifaddr(void __user *arg)
{
        struct in6_ifreq ireq;
        int err;
 
        if (!capable(CAP_NET_ADMIN))
                return -EPERM;
 
        if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
                return -EFAULT;
 
        rtnl_lock();
        err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
                             IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
        rtnl_unlock();
        return err;
}
 
int addrconf_del_ifaddr(void __user *arg)
{
        struct in6_ifreq ireq;
        int err;
 
        if (!capable(CAP_NET_ADMIN))
                return -EPERM;
 
        if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
                return -EFAULT;
 
        rtnl_lock();
        err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
        rtnl_unlock();
        return err;
}
 
#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
static void sit_add_v4_addrs(struct inet6_dev *idev)
{
        struct inet6_ifaddr * ifp;
        struct in6_addr addr;
        struct net_device *dev;
        int scope;
 
        ASSERT_RTNL();
 
        memset(&addr, 0, sizeof(struct in6_addr));
        memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
 
        if (idev->dev->flags&IFF_POINTOPOINT) {
                addr.s6_addr32[0] = htonl(0xfe800000);
                scope = IFA_LINK;
        } else {
                scope = IPV6_ADDR_COMPATv4;
        }
 
        if (addr.s6_addr32[3]) {
                ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
                if (!IS_ERR(ifp)) {
                        spin_lock_bh(&ifp->lock);
                        ifp->flags &= ~IFA_F_TENTATIVE;
                        spin_unlock_bh(&ifp->lock);
                        ipv6_ifa_notify(RTM_NEWADDR, ifp);
                        in6_ifa_put(ifp);
                }
                return;
        }
 
        for_each_netdev(&init_net, dev) {
                struct in_device * in_dev = __in_dev_get_rtnl(dev);
                if (in_dev && (dev->flags & IFF_UP)) {
                        struct in_ifaddr * ifa;
 
                        int flag = scope;
 
                        for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
                                int plen;
 
                                addr.s6_addr32[3] = ifa->ifa_local;
 
                                if (ifa->ifa_scope == RT_SCOPE_LINK)
                                        continue;
                                if (ifa->ifa_scope >= RT_SCOPE_HOST) {
                                        if (idev->dev->flags&IFF_POINTOPOINT)
                                                continue;
                                        flag |= IFA_HOST;
                                }
                                if (idev->dev->flags&IFF_POINTOPOINT)
                                        plen = 64;
                                else
                                        plen = 96;
 
                                ifp = ipv6_add_addr(idev, &addr, plen, flag,
                                                    IFA_F_PERMANENT);
                                if (!IS_ERR(ifp)) {
                                        spin_lock_bh(&ifp->lock);
                                        ifp->flags &= ~IFA_F_TENTATIVE;
                                        spin_unlock_bh(&ifp->lock);
                                        ipv6_ifa_notify(RTM_NEWADDR, ifp);
                                        in6_ifa_put(ifp);
                                }
                        }
                }
        }
}
#endif
 
static void init_loopback(struct net_device *dev)
{
        struct inet6_dev  *idev;
        struct inet6_ifaddr * ifp;
 
        /* ::1 */
 
        ASSERT_RTNL();
 
        if ((idev = ipv6_find_idev(dev)) == NULL) {
                printk(KERN_DEBUG "init loopback: add_dev failed\n");
                return;
        }
 
        ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
        if (!IS_ERR(ifp)) {
                spin_lock_bh(&ifp->lock);
                ifp->flags &= ~IFA_F_TENTATIVE;
                spin_unlock_bh(&ifp->lock);
                ipv6_ifa_notify(RTM_NEWADDR, ifp);
                in6_ifa_put(ifp);
        }
}
 
static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
{
        struct inet6_ifaddr * ifp;
        u32 addr_flags = IFA_F_PERMANENT;
 
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
        if (idev->cnf.optimistic_dad &&
            !ipv6_devconf.forwarding)
                addr_flags |= IFA_F_OPTIMISTIC;
#endif
 
 
        ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
        if (!IS_ERR(ifp)) {
                addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
                addrconf_dad_start(ifp, 0);
                in6_ifa_put(ifp);
        }
}
 
static void addrconf_dev_config(struct net_device *dev)
{
        struct in6_addr addr;
        struct inet6_dev    * idev;
 
        ASSERT_RTNL();
 
        if ((dev->type != ARPHRD_ETHER) &&
            (dev->type != ARPHRD_FDDI) &&
            (dev->type != ARPHRD_IEEE802_TR) &&
            (dev->type != ARPHRD_ARCNET) &&
            (dev->type != ARPHRD_INFINIBAND)) {
                /* Alas, we support only Ethernet autoconfiguration. */
                return;
        }
 
        idev = addrconf_add_dev(dev);
        if (idev == NULL)
                return;
 
        memset(&addr, 0, sizeof(struct in6_addr));
        addr.s6_addr32[0] = htonl(0xFE800000);
 
        if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
                addrconf_add_linklocal(idev, &addr);
}
 
#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
static void addrconf_sit_config(struct net_device *dev)
{
        struct inet6_dev *idev;
 
        ASSERT_RTNL();
 
        /*
         * Configure the tunnel with one of our IPv4
         * addresses... we should configure all of
         * our v4 addrs in the tunnel
         */
 
        if ((idev = ipv6_find_idev(dev)) == NULL) {
                printk(KERN_DEBUG "init sit: add_dev failed\n");
                return;
        }
 
        sit_add_v4_addrs(idev);
 
        if (dev->flags&IFF_POINTOPOINT) {
                addrconf_add_mroute(dev);
                addrconf_add_lroute(dev);
        } else
                sit_route_add(dev);
}
#endif
 
static inline int
ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
{
        struct in6_addr lladdr;
 
        if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
                addrconf_add_linklocal(idev, &lladdr);
                return 0;
        }
        return -1;
}
 
static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
{
        struct net_device *link_dev;
 
        /* first try to inherit the link-local address from the link device */
        if (idev->dev->iflink &&
            (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
                if (!ipv6_inherit_linklocal(idev, link_dev))
                        return;
        }
        /* then try to inherit it from any device */
        for_each_netdev(&init_net, link_dev) {
                if (!ipv6_inherit_linklocal(idev, link_dev))
                        return;
        }
        printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
}
 
/*
 * Autoconfigure tunnel with a link-local address so routing protocols,
 * DHCPv6, MLD etc. can be run over the virtual link
 */
 
static void addrconf_ip6_tnl_config(struct net_device *dev)
{
        struct inet6_dev *idev;
 
        ASSERT_RTNL();
 
        if ((idev = addrconf_add_dev(dev)) == NULL) {
                printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
                return;
        }
        ip6_tnl_add_linklocal(idev);
}
 
static int addrconf_notify(struct notifier_block *this, unsigned long event,
                           void * data)
{
        struct net_device *dev = (struct net_device *) data;
        struct inet6_dev *idev = __in6_dev_get(dev);
        int run_pending = 0;
        int err;
 
        if (dev->nd_net != &init_net)
                return NOTIFY_DONE;
 
        switch(event) {
        case NETDEV_REGISTER:
                if (!idev && dev->mtu >= IPV6_MIN_MTU) {
                        idev = ipv6_add_dev(dev);
                        if (!idev)
                                return notifier_from_errno(-ENOMEM);
                }
                break;
        case NETDEV_UP:
        case NETDEV_CHANGE:
                if (dev->flags & IFF_SLAVE)
                        break;
 
                if (event == NETDEV_UP) {
                        if (!addrconf_qdisc_ok(dev)) {
                                /* device is not ready yet. */
                                printk(KERN_INFO
                                        "ADDRCONF(NETDEV_UP): %s: "
                                        "link is not ready\n",
                                        dev->name);
                                break;
                        }
 
                        if (!idev && dev->mtu >= IPV6_MIN_MTU)
                                idev = ipv6_add_dev(dev);
 
                        if (idev)
                                idev->if_flags |= IF_READY;
                } else {
                        if (!addrconf_qdisc_ok(dev)) {
                                /* device is still not ready. */
                                break;
                        }
 
                        if (idev) {
                                if (idev->if_flags & IF_READY) {
                                        /* device is already configured. */
                                        break;
                                }
                                idev->if_flags |= IF_READY;
                        }
 
                        printk(KERN_INFO
                                        "ADDRCONF(NETDEV_CHANGE): %s: "
                                        "link becomes ready\n",
                                        dev->name);
 
                        run_pending = 1;
                }
 
                switch(dev->type) {
#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
                case ARPHRD_SIT:
                        addrconf_sit_config(dev);
                        break;
#endif
                case ARPHRD_TUNNEL6:
                        addrconf_ip6_tnl_config(dev);
                        break;
                case ARPHRD_LOOPBACK:
                        init_loopback(dev);
                        break;
 
                default:
                        addrconf_dev_config(dev);
                        break;
                }
                if (idev) {
                        if (run_pending)
                                addrconf_dad_run(idev);
 
                        /* If the MTU changed during the interface down, when the
                           interface up, the changed MTU must be reflected in the
                           idev as well as routers.
                         */
                        if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
                                rt6_mtu_change(dev, dev->mtu);
                                idev->cnf.mtu6 = dev->mtu;
                        }
                        idev->tstamp = jiffies;
                        inet6_ifinfo_notify(RTM_NEWLINK, idev);
                        /* If the changed mtu during down is lower than IPV6_MIN_MTU
                           stop IPv6 on this interface.
                         */
                        if (dev->mtu < IPV6_MIN_MTU)
                                addrconf_ifdown(dev, event != NETDEV_DOWN);
                }
                break;
 
        case NETDEV_CHANGEMTU:
                if (idev && dev->mtu >= IPV6_MIN_MTU) {
                        rt6_mtu_change(dev, dev->mtu);
                        idev->cnf.mtu6 = dev->mtu;
                        break;
                }
 
                if (!idev && dev->mtu >= IPV6_MIN_MTU) {
                        idev = ipv6_add_dev(dev);
                        if (idev)
                                break;
                }
 
                /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
 
        case NETDEV_DOWN:
        case NETDEV_UNREGISTER:
                /*
                 *      Remove all addresses from this interface.
                 */
                addrconf_ifdown(dev, event != NETDEV_DOWN);
                break;
 
        case NETDEV_CHANGENAME:
                if (idev) {
                        snmp6_unregister_dev(idev);
#ifdef CONFIG_SYSCTL
                        addrconf_sysctl_unregister(&idev->cnf);
                        neigh_sysctl_unregister(idev->nd_parms);
                        neigh_sysctl_register(dev, idev->nd_parms,
                                              NET_IPV6, NET_IPV6_NEIGH, "ipv6",
                                              &ndisc_ifinfo_sysctl_change,
                                              NULL);
                        addrconf_sysctl_register(idev, &idev->cnf);
#endif
                        err = snmp6_register_dev(idev);
                        if (err)
                                return notifier_from_errno(err);
                }
                break;
        }
 
        return NOTIFY_OK;
}
 
/*
 *      addrconf module should be notified of a device going up
 */
static struct notifier_block ipv6_dev_notf = {
        .notifier_call = addrconf_notify,
        .priority = 0
};
 
static int addrconf_ifdown(struct net_device *dev, int how)
{
        struct inet6_dev *idev;
        struct inet6_ifaddr *ifa, **bifa;
        int i;
 
        ASSERT_RTNL();
 
        if (dev == init_net.loopback_dev && how == 1)
                how = 0;
 
        rt6_ifdown(dev);
        neigh_ifdown(&nd_tbl, dev);
 
        idev = __in6_dev_get(dev);
        if (idev == NULL)
                return -ENODEV;
 
        /* Step 1: remove reference to ipv6 device from parent device.
                   Do not dev_put!
         */
        if (how == 1) {
                idev->dead = 1;
 
                /* protected by rtnl_lock */
                rcu_assign_pointer(dev->ip6_ptr, NULL);
 
                /* Step 1.5: remove snmp6 entry */
                snmp6_unregister_dev(idev);
 
        }
 
        /* Step 2: clear hash table */
        for (i=0; i<IN6_ADDR_HSIZE; i++) {
                bifa = &inet6_addr_lst[i];
 
                write_lock_bh(&addrconf_hash_lock);
                while ((ifa = *bifa) != NULL) {
                        if (ifa->idev == idev) {
                                *bifa = ifa->lst_next;
                                ifa->lst_next = NULL;
                                addrconf_del_timer(ifa);
                                in6_ifa_put(ifa);
                                continue;
                        }
                        bifa = &ifa->lst_next;
                }
                write_unlock_bh(&addrconf_hash_lock);
        }
 
        write_lock_bh(&idev->lock);
 
        /* Step 3: clear flags for stateless addrconf */
        if (how != 1)
                idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
 
        /* Step 4: clear address list */
#ifdef CONFIG_IPV6_PRIVACY
        if (how == 1 && del_timer(&idev->regen_timer))
                in6_dev_put(idev);
 
        /* clear tempaddr list */
        while ((ifa = idev->tempaddr_list) != NULL) {
                idev->tempaddr_list = ifa->tmp_next;
                ifa->tmp_next = NULL;
                ifa->dead = 1;
                write_unlock_bh(&idev->lock);
                spin_lock_bh(&ifa->lock);
 
                if (ifa->ifpub) {
                        in6_ifa_put(ifa->ifpub);
                        ifa->ifpub = NULL;
                }
                spin_unlock_bh(&ifa->lock);
                in6_ifa_put(ifa);
                write_lock_bh(&idev->lock);
        }
#endif
        while ((ifa = idev->addr_list) != NULL) {
                idev->addr_list = ifa->if_next;
                ifa->if_next = NULL;
                ifa->dead = 1;
                addrconf_del_timer(ifa);
                write_unlock_bh(&idev->lock);
 
                __ipv6_ifa_notify(RTM_DELADDR, ifa);
                atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
                in6_ifa_put(ifa);
 
                write_lock_bh(&idev->lock);
        }
        write_unlock_bh(&idev->lock);
 
        /* Step 5: Discard multicast list */
 
        if (how == 1)
                ipv6_mc_destroy_dev(idev);
        else
                ipv6_mc_down(idev);
 
        idev->tstamp = jiffies;
 
        /* Shot the device (if unregistered) */
 
        if (how == 1) {
#ifdef CONFIG_SYSCTL
                addrconf_sysctl_unregister(&idev->cnf);
                neigh_sysctl_unregister(idev->nd_parms);
#endif
                neigh_parms_release(&nd_tbl, idev->nd_parms);
                neigh_ifdown(&nd_tbl, dev);
                in6_dev_put(idev);
        }
        return 0;
}
 
static void addrconf_rs_timer(unsigned long data)
{
        struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
 
        if (ifp->idev->cnf.forwarding)
                goto out;
 
        if (ifp->idev->if_flags & IF_RA_RCVD) {
                /*
                 *      Announcement received after solicitation
                 *      was sent
                 */
                goto out;
        }
 
        spin_lock(&ifp->lock);
        if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
                struct in6_addr all_routers;
 
                /* The wait after the last probe can be shorter */
                addrconf_mod_timer(ifp, AC_RS,
                                   (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
                                   ifp->idev->cnf.rtr_solicit_delay :
                                   ifp->idev->cnf.rtr_solicit_interval);
                spin_unlock(&ifp->lock);
 
                ipv6_addr_all_routers(&all_routers);
 
                ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
        } else {
                spin_unlock(&ifp->lock);
                /*
                 * Note: we do not support deprecated "all on-link"
                 * assumption any longer.
                 */
                printk(KERN_DEBUG "%s: no IPv6 routers present\n",
                       ifp->idev->dev->name);
        }
 
out:
        in6_ifa_put(ifp);
}
 
/*
 *      Duplicate Address Detection
 */
static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
{
        unsigned long rand_num;
        struct inet6_dev *idev = ifp->idev;
 
        if (ifp->flags & IFA_F_OPTIMISTIC)
                rand_num = 0;
        else
                rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
 
        ifp->probes = idev->cnf.dad_transmits;
        addrconf_mod_timer(ifp, AC_DAD, rand_num);
}
 
static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
{
        struct inet6_dev *idev = ifp->idev;
        struct net_device *dev = idev->dev;
 
        addrconf_join_solict(dev, &ifp->addr);
 
        net_srandom(ifp->addr.s6_addr32[3]);
 
        read_lock_bh(&idev->lock);
        if (ifp->dead)
                goto out;
        spin_lock_bh(&ifp->lock);
 
        if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
            !(ifp->flags&IFA_F_TENTATIVE) ||
            ifp->flags & IFA_F_NODAD) {
                ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
                spin_unlock_bh(&ifp->lock);
                read_unlock_bh(&idev->lock);
 
                addrconf_dad_completed(ifp);
                return;
        }
 
        if (!(idev->if_flags & IF_READY)) {
                spin_unlock_bh(&ifp->lock);
                read_unlock_bh(&idev->lock);
                /*
                 * If the defice is not ready:
                 * - keep it tentative if it is a permanent address.
                 * - otherwise, kill it.
                 */
                in6_ifa_hold(ifp);
                addrconf_dad_stop(ifp);
                return;
        }
 
        /*
         * Optimistic nodes can start receiving
         * Frames right away
         */
        if(ifp->flags & IFA_F_OPTIMISTIC)
                ip6_ins_rt(ifp->rt);
 
        addrconf_dad_kick(ifp);
        spin_unlock_bh(&ifp->lock);
out:
        read_unlock_bh(&idev->lock);
}
 
static void addrconf_dad_timer(unsigned long data)
{
        struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
        struct inet6_dev *idev = ifp->idev;
        struct in6_addr unspec;
        struct in6_addr mcaddr;
 
        read_lock_bh(&idev->lock);
        if (idev->dead) {
                read_unlock_bh(&idev->lock);
                goto out;
        }
        spin_lock_bh(&ifp->lock);
        if (ifp->probes == 0) {
                /*
                 * DAD was successful
                 */
 
                ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
                spin_unlock_bh(&ifp->lock);
                read_unlock_bh(&idev->lock);
 
                addrconf_dad_completed(ifp);
 
                goto out;
        }
 
        ifp->probes--;
        addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
        spin_unlock_bh(&ifp->lock);
        read_unlock_bh(&idev->lock);
 
        /* send a neighbour solicitation for our addr */
        memset(&unspec, 0, sizeof(unspec));
        addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
        ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
out:
        in6_ifa_put(ifp);
}
 
static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
{
        struct net_device *     dev = ifp->idev->dev;
 
        /*
         *      Configure the address for reception. Now it is valid.
         */
 
        ipv6_ifa_notify(RTM_NEWADDR, ifp);
 
        /* If added prefix is link local and forwarding is off,
           start sending router solicitations.
         */
 
        if (ifp->idev->cnf.forwarding == 0 &&
            ifp->idev->cnf.rtr_solicits > 0 &&
            (dev->flags&IFF_LOOPBACK) == 0 &&
            (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
                struct in6_addr all_routers;
 
                ipv6_addr_all_routers(&all_routers);
 
                /*
                 *      If a host as already performed a random delay
                 *      [...] as part of DAD [...] there is no need
                 *      to delay again before sending the first RS
                 */
                ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
 
                spin_lock_bh(&ifp->lock);
                ifp->probes = 1;
                ifp->idev->if_flags |= IF_RS_SENT;
                addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
                spin_unlock_bh(&ifp->lock);
        }
}
 
static void addrconf_dad_run(struct inet6_dev *idev) {
        struct inet6_ifaddr *ifp;
 
        read_lock_bh(&idev->lock);
        for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
                spin_lock_bh(&ifp->lock);
                if (!(ifp->flags & IFA_F_TENTATIVE)) {
                        spin_unlock_bh(&ifp->lock);
                        continue;
                }
                spin_unlock_bh(&ifp->lock);
                addrconf_dad_kick(ifp);
        }
        read_unlock_bh(&idev->lock);
}
 
#ifdef CONFIG_PROC_FS
struct if6_iter_state {
        int bucket;
};
 
static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
{
        struct inet6_ifaddr *ifa = NULL;
        struct if6_iter_state *state = seq->private;
 
        for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
                ifa = inet6_addr_lst[state->bucket];
                if (ifa)
                        break;
        }
        return ifa;
}
 
static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
{
        struct if6_iter_state *state = seq->private;
 
        ifa = ifa->lst_next;
try_again:
        if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
                ifa = inet6_addr_lst[state->bucket];
                goto try_again;
        }
        return ifa;
}
 
static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
{
        struct inet6_ifaddr *ifa = if6_get_first(seq);
 
        if (ifa)
                while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
                        --pos;
        return pos ? NULL : ifa;
}
 
static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
{
        read_lock_bh(&addrconf_hash_lock);
        return if6_get_idx(seq, *pos);
}
 
static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
        struct inet6_ifaddr *ifa;
 
        ifa = if6_get_next(seq, v);
        ++*pos;
        return ifa;
}
 
static void if6_seq_stop(struct seq_file *seq, void *v)
{
        read_unlock_bh(&addrconf_hash_lock);
}
 
static int if6_seq_show(struct seq_file *seq, void *v)
{
        struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
        seq_printf(seq,
                   NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
                   NIP6(ifp->addr),
                   ifp->idev->dev->ifindex,
                   ifp->prefix_len,
                   ifp->scope,
                   ifp->flags,
                   ifp->idev->dev->name);
        return 0;
}
 
static const struct seq_operations if6_seq_ops = {
        .start  = if6_seq_start,
        .next   = if6_seq_next,
        .show   = if6_seq_show,
        .stop   = if6_seq_stop,
};
 
static int if6_seq_open(struct inode *inode, struct file *file)
{
        return seq_open_private(file, &if6_seq_ops,
                        sizeof(struct if6_iter_state));
}
 
static const struct file_operations if6_fops = {
        .owner          = THIS_MODULE,
        .open           = if6_seq_open,
        .read           = seq_read,
        .llseek         = seq_lseek,
        .release        = seq_release_private,
};
 
int __init if6_proc_init(void)
{
        if (!proc_net_fops_create(&init_net, "if_inet6", S_IRUGO, &if6_fops))
                return -ENOMEM;
        return 0;
}
 
void if6_proc_exit(void)
{
        proc_net_remove(&init_net, "if_inet6");
}
#endif  /* CONFIG_PROC_FS */
 
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
/* Check if address is a home address configured on any interface. */
int ipv6_chk_home_addr(struct in6_addr *addr)
{
        int ret = 0;
        struct inet6_ifaddr * ifp;
        u8 hash = ipv6_addr_hash(addr);
        read_lock_bh(&addrconf_hash_lock);
        for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
                if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
                    (ifp->flags & IFA_F_HOMEADDRESS)) {
                        ret = 1;
                        break;
                }
        }
        read_unlock_bh(&addrconf_hash_lock);
        return ret;
}
#endif
 
/*
 *      Periodic address status verification
 */
 
static void addrconf_verify(unsigned long foo)
{
        struct inet6_ifaddr *ifp;
        unsigned long now, next;
        int i;
 
        spin_lock_bh(&addrconf_verify_lock);
        now = jiffies;
        next = now + ADDR_CHECK_FREQUENCY;
 
        del_timer(&addr_chk_timer);
 
        for (i=0; i < IN6_ADDR_HSIZE; i++) {
 
restart:
                read_lock(&addrconf_hash_lock);
                for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
                        unsigned long age;
#ifdef CONFIG_IPV6_PRIVACY
                        unsigned long regen_advance;
#endif
 
                        if (ifp->flags & IFA_F_PERMANENT)
                                continue;
 
                        spin_lock(&ifp->lock);
                        age = (now - ifp->tstamp) / HZ;
 
#ifdef CONFIG_IPV6_PRIVACY
                        regen_advance = ifp->idev->cnf.regen_max_retry *
                                        ifp->idev->cnf.dad_transmits *
                                        ifp->idev->nd_parms->retrans_time / HZ;
#endif
 
                        if (ifp->valid_lft != INFINITY_LIFE_TIME &&
                            age >= ifp->valid_lft) {
                                spin_unlock(&ifp->lock);
                                in6_ifa_hold(ifp);
                                read_unlock(&addrconf_hash_lock);
                                ipv6_del_addr(ifp);
                                goto restart;
                        } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
                                spin_unlock(&ifp->lock);
                                continue;
                        } else if (age >= ifp->prefered_lft) {
                                /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
                                int deprecate = 0;
 
                                if (!(ifp->flags&IFA_F_DEPRECATED)) {
                                        deprecate = 1;
                                        ifp->flags |= IFA_F_DEPRECATED;
                                }
 
                                if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
                                        next = ifp->tstamp + ifp->valid_lft * HZ;
 
                                spin_unlock(&ifp->lock);
 
                                if (deprecate) {
                                        in6_ifa_hold(ifp);
                                        read_unlock(&addrconf_hash_lock);
 
                                        ipv6_ifa_notify(0, ifp);
                                        in6_ifa_put(ifp);
                                        goto restart;
                                }
#ifdef CONFIG_IPV6_PRIVACY
                        } else if ((ifp->flags&IFA_F_TEMPORARY) &&
                                   !(ifp->flags&IFA_F_TENTATIVE)) {
                                if (age >= ifp->prefered_lft - regen_advance) {
                                        struct inet6_ifaddr *ifpub = ifp->ifpub;
                                        if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
                                                next = ifp->tstamp + ifp->prefered_lft * HZ;
                                        if (!ifp->regen_count && ifpub) {
                                                ifp->regen_count++;
                                                in6_ifa_hold(ifp);
                                                in6_ifa_hold(ifpub);
                                                spin_unlock(&ifp->lock);
                                                read_unlock(&addrconf_hash_lock);
                                                spin_lock(&ifpub->lock);
                                                ifpub->regen_count = 0;
                                                spin_unlock(&ifpub->lock);
                                                ipv6_create_tempaddr(ifpub, ifp);
                                                in6_ifa_put(ifpub);
                                                in6_ifa_put(ifp);
                                                goto restart;
                                        }
                                } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
                                        next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
                                spin_unlock(&ifp->lock);
#endif
                        } else {
                                /* ifp->prefered_lft <= ifp->valid_lft */
                                if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
                                        next = ifp->tstamp + ifp->prefered_lft * HZ;
                                spin_unlock(&ifp->lock);
                        }
                }
                read_unlock(&addrconf_hash_lock);
        }
 
        addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
        add_timer(&addr_chk_timer);
        spin_unlock_bh(&addrconf_verify_lock);
}
 
static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
{
        struct in6_addr *pfx = NULL;
 
        if (addr)
                pfx = nla_data(addr);
 
        if (local) {
                if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
                        pfx = NULL;
                else
                        pfx = nla_data(local);
        }
 
        return pfx;
}
 
static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
        [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
        [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
        [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
};
 
static int
inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
        struct ifaddrmsg *ifm;
        struct nlattr *tb[IFA_MAX+1];
        struct in6_addr *pfx;
        int err;
 
        err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
        if (err < 0)
                return err;
 
        ifm = nlmsg_data(nlh);
        pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
        if (pfx == NULL)
                return -EINVAL;
 
        return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
}
 
static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
                             u32 prefered_lft, u32 valid_lft)
{
        u32 flags = RTF_EXPIRES;
 
        if (!valid_lft || (prefered_lft > valid_lft))
                return -EINVAL;
 
        if (valid_lft == INFINITY_LIFE_TIME) {
                ifa_flags |= IFA_F_PERMANENT;
                flags = 0;
        } else if (valid_lft >= 0x7FFFFFFF/HZ)
                valid_lft = 0x7FFFFFFF/HZ;
 
        if (prefered_lft == 0)
                ifa_flags |= IFA_F_DEPRECATED;
        else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
                 (prefered_lft != INFINITY_LIFE_TIME))
                prefered_lft = 0x7FFFFFFF/HZ;
 
        spin_lock_bh(&ifp->lock);
        ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
        ifp->tstamp = jiffies;
        ifp->valid_lft = valid_lft;
        ifp->prefered_lft = prefered_lft;
 
        spin_unlock_bh(&ifp->lock);
        if (!(ifp->flags&IFA_F_TENTATIVE))
                ipv6_ifa_notify(0, ifp);
 
        addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
                              jiffies_to_clock_t(valid_lft * HZ), flags);
        addrconf_verify(0);
 
        return 0;
}
 
static int
inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
        struct ifaddrmsg *ifm;
        struct nlattr *tb[IFA_MAX+1];
        struct in6_addr *pfx;
        struct inet6_ifaddr *ifa;
        struct net_device *dev;
        u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
        u8 ifa_flags;
        int err;
 
        err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
        if (err < 0)
                return err;
 
        ifm = nlmsg_data(nlh);
        pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
        if (pfx == NULL)
                return -EINVAL;
 
        if (tb[IFA_CACHEINFO]) {
                struct ifa_cacheinfo *ci;
 
                ci = nla_data(tb[IFA_CACHEINFO]);
                valid_lft = ci->ifa_valid;
                preferred_lft = ci->ifa_prefered;
        } else {
                preferred_lft = INFINITY_LIFE_TIME;
                valid_lft = INFINITY_LIFE_TIME;
        }
 
        dev =  __dev_get_by_index(&init_net, ifm->ifa_index);
        if (dev == NULL)
                return -ENODEV;
 
        /* We ignore other flags so far. */
        ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
 
        ifa = ipv6_get_ifaddr(pfx, dev, 1);
        if (ifa == NULL) {
                /*
                 * It would be best to check for !NLM_F_CREATE here but
                 * userspace alreay relies on not having to provide this.
                 */
                return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
                                      ifa_flags, preferred_lft, valid_lft);
        }
 
        if (nlh->nlmsg_flags & NLM_F_EXCL ||
            !(nlh->nlmsg_flags & NLM_F_REPLACE))
                err = -EEXIST;
        else
                err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
 
        in6_ifa_put(ifa);
 
        return err;
}
 
static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
                          u8 scope, int ifindex)
{
        struct ifaddrmsg *ifm;
 
        ifm = nlmsg_data(nlh);
        ifm->ifa_family = AF_INET6;
        ifm->ifa_prefixlen = prefixlen;
        ifm->ifa_flags = flags;
        ifm->ifa_scope = scope;
        ifm->ifa_index = ifindex;
}
 
static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
                         unsigned long tstamp, u32 preferred, u32 valid)
{
        struct ifa_cacheinfo ci;
 
        ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
                        + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
        ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
                        + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
        ci.ifa_prefered = preferred;
        ci.ifa_valid = valid;
 
        return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
}
 
static inline int rt_scope(int ifa_scope)
{
        if (ifa_scope & IFA_HOST)
                return RT_SCOPE_HOST;
        else if (ifa_scope & IFA_LINK)
                return RT_SCOPE_LINK;
        else if (ifa_scope & IFA_SITE)
                return RT_SCOPE_SITE;
        else
                return RT_SCOPE_UNIVERSE;
}
 
static inline int inet6_ifaddr_msgsize(void)
{
        return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
               + nla_total_size(16) /* IFA_ADDRESS */
               + nla_total_size(sizeof(struct ifa_cacheinfo));
}
 
static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
                             u32 pid, u32 seq, int event, unsigned int flags)
{
        struct nlmsghdr  *nlh;
        u32 preferred, valid;
 
        nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
        if (nlh == NULL)
                return -EMSGSIZE;
 
        put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
                      ifa->idev->dev->ifindex);
 
        if (!(ifa->flags&IFA_F_PERMANENT)) {
                preferred = ifa->prefered_lft;
                valid = ifa->valid_lft;
                if (preferred != INFINITY_LIFE_TIME) {
                        long tval = (jiffies - ifa->tstamp)/HZ;
                        preferred -= tval;
                        if (valid != INFINITY_LIFE_TIME)
                                valid -= tval;
                }
        } else {
                preferred = INFINITY_LIFE_TIME;
                valid = INFINITY_LIFE_TIME;
        }
 
        if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
            put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
                nlmsg_cancel(skb, nlh);
                return -EMSGSIZE;
        }
 
        return nlmsg_end(skb, nlh);
}
 
static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
                                u32 pid, u32 seq, int event, u16 flags)
{
        struct nlmsghdr  *nlh;
        u8 scope = RT_SCOPE_UNIVERSE;
        int ifindex = ifmca->idev->dev->ifindex;
 
        if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
                scope = RT_SCOPE_SITE;
 
        nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
        if (nlh == NULL)
                return -EMSGSIZE;
 
        put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
        if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
            put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
                          INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
                nlmsg_cancel(skb, nlh);
                return -EMSGSIZE;
        }
 
        return nlmsg_end(skb, nlh);
}
 
static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
                                u32 pid, u32 seq, int event, unsigned int flags)
{
        struct nlmsghdr  *nlh;
        u8 scope = RT_SCOPE_UNIVERSE;
        int ifindex = ifaca->aca_idev->dev->ifindex;
 
        if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
                scope = RT_SCOPE_SITE;
 
        nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
        if (nlh == NULL)
                return -EMSGSIZE;
 
        put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
        if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
            put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
                          INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
                nlmsg_cancel(skb, nlh);
                return -EMSGSIZE;
        }
 
        return nlmsg_end(skb, nlh);
}
 
enum addr_type_t
{
        UNICAST_ADDR,
        MULTICAST_ADDR,
        ANYCAST_ADDR,
};
 
static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
                           enum addr_type_t type)
{
        int idx, ip_idx;
        int s_idx, s_ip_idx;
        int err = 1;
        struct net_device *dev;
        struct inet6_dev *idev = NULL;
        struct inet6_ifaddr *ifa;
        struct ifmcaddr6 *ifmca;
        struct ifacaddr6 *ifaca;
 
        s_idx = cb->args[0];
        s_ip_idx = ip_idx = cb->args[1];
 
        idx = 0;
        for_each_netdev(&init_net, dev) {
                if (idx < s_idx)
                        goto cont;
                if (idx > s_idx)
                        s_ip_idx = 0;
                ip_idx = 0;
                if ((idev = in6_dev_get(dev)) == NULL)
                        goto cont;
                read_lock_bh(&idev->lock);
                switch (type) {
                case UNICAST_ADDR:
                        /* unicast address incl. temp addr */
                        for (ifa = idev->addr_list; ifa;
                             ifa = ifa->if_next, ip_idx++) {
                                if (ip_idx < s_ip_idx)
                                        continue;
                                if ((err = inet6_fill_ifaddr(skb, ifa,
                                    NETLINK_CB(cb->skb).pid,
                                    cb->nlh->nlmsg_seq, RTM_NEWADDR,
                                    NLM_F_MULTI)) <= 0)
                                        goto done;
                        }
                        break;
                case MULTICAST_ADDR:
                        /* multicast address */
                        for (ifmca = idev->mc_list; ifmca;
                             ifmca = ifmca->next, ip_idx++) {
                                if (ip_idx < s_ip_idx)
                                        continue;
                                if ((err = inet6_fill_ifmcaddr(skb, ifmca,
                                    NETLINK_CB(cb->skb).pid,
                                    cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
                                    NLM_F_MULTI)) <= 0)
                                        goto done;
                        }
                        break;
                case ANYCAST_ADDR:
                        /* anycast address */
                        for (ifaca = idev->ac_list; ifaca;
                             ifaca = ifaca->aca_next, ip_idx++) {
                                if (ip_idx < s_ip_idx)
                                        continue;
                                if ((err = inet6_fill_ifacaddr(skb, ifaca,
                                    NETLINK_CB(cb->skb).pid,
                                    cb->nlh->nlmsg_seq, RTM_GETANYCAST,
                                    NLM_F_MULTI)) <= 0)
                                        goto done;
                        }
                        break;
                default:
                        break;
                }
                read_unlock_bh(&idev->lock);
                in6_dev_put(idev);
cont:
                idx++;
        }
done:
        if (err <= 0) {
                read_unlock_bh(&idev->lock);
                in6_dev_put(idev);
        }
        cb->args[0] = idx;
        cb->args[1] = ip_idx;
        return skb->len;
}
 
static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
{
        enum addr_type_t type = UNICAST_ADDR;
        return inet6_dump_addr(skb, cb, type);
}
 
static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
{
        enum addr_type_t type = MULTICAST_ADDR;
        return inet6_dump_addr(skb, cb, type);
}
 
 
static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
{
        enum addr_type_t type = ANYCAST_ADDR;
        return inet6_dump_addr(skb, cb, type);
}
 
static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
                             void *arg)
{
        struct ifaddrmsg *ifm;
        struct nlattr *tb[IFA_MAX+1];
        struct in6_addr *addr = NULL;
        struct net_device *dev = NULL;
        struct inet6_ifaddr *ifa;
        struct sk_buff *skb;
        int err;
 
        err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
        if (err < 0)
                goto errout;
 
        addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
        if (addr == NULL) {
                err = -EINVAL;
                goto errout;
        }
 
        ifm = nlmsg_data(nlh);
        if (ifm->ifa_index)
                dev = __dev_get_by_index(&init_net, ifm->ifa_index);
 
        if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
                err = -EADDRNOTAVAIL;
                goto errout;
        }
 
        if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
                err = -ENOBUFS;
                goto errout_ifa;
        }
 
        err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
                                nlh->nlmsg_seq, RTM_NEWADDR, 0);
        if (err < 0) {
                /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
                WARN_ON(err == -EMSGSIZE);
                kfree_skb(skb);
                goto errout_ifa;
        }
        err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
errout_ifa:
        in6_ifa_put(ifa);
errout:
        return err;
}
 
static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
{
        struct sk_buff *skb;
        int err = -ENOBUFS;
 
        skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
        if (skb == NULL)
                goto errout;
 
        err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
        if (err < 0) {
                /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
                WARN_ON(err == -EMSGSIZE);
                kfree_skb(skb);
                goto errout;
        }
        err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
errout:
        if (err < 0)
                rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
}
 
static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
                                __s32 *array, int bytes)
{
        BUG_ON(bytes < (DEVCONF_MAX * 4));
 
        memset(array, 0, bytes);
        array[DEVCONF_FORWARDING] = cnf->forwarding;
        array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
        array[DEVCONF_MTU6] = cnf->mtu6;
        array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
        array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
        array[DEVCONF_AUTOCONF] = cnf->autoconf;
        array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
        array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
        array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
        array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
        array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
#ifdef CONFIG_IPV6_PRIVACY
        array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
        array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
        array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
        array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
        array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
#endif
        array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
        array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
        array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
#ifdef CONFIG_IPV6_ROUTER_PREF
        array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
        array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
#ifdef CONFIG_IPV6_ROUTE_INFO
        array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
#endif
#endif
        array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
        array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
        array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
#endif
}
 
static inline size_t inet6_if_nlmsg_size(void)
{
        return NLMSG_ALIGN(sizeof(struct ifinfomsg))
               + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
               + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
               + nla_total_size(4) /* IFLA_MTU */
               + nla_total_size(4) /* IFLA_LINK */
               + nla_total_size( /* IFLA_PROTINFO */
                        nla_total_size(4) /* IFLA_INET6_FLAGS */
                        + nla_total_size(sizeof(struct ifla_cacheinfo))
                        + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
                        + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
                        + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
                 );
}
 
static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
                                      int bytes)
{
        int i;
        int pad = bytes - sizeof(u64) * items;
        BUG_ON(pad < 0);
 
        /* Use put_unaligned() because stats may not be aligned for u64. */
        put_unaligned(items, &stats[0]);
        for (i = 1; i < items; i++)
                put_unaligned(snmp_fold_field(mib, i), &stats[i]);
 
        memset(&stats[items], 0, pad);
}
 
static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
                             int bytes)
{
        switch(attrtype) {
        case IFLA_INET6_STATS:
                __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
                break;
        case IFLA_INET6_ICMP6STATS:
                __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
                break;
        }
}
 
static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
                             u32 pid, u32 seq, int event, unsigned int flags)
{
        struct net_device *dev = idev->dev;
        struct nlattr *nla;
        struct ifinfomsg *hdr;
        struct nlmsghdr *nlh;
        void *protoinfo;
        struct ifla_cacheinfo ci;
 
        nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
        if (nlh == NULL)
                return -EMSGSIZE;
 
        hdr = nlmsg_data(nlh);
        hdr->ifi_family = AF_INET6;
        hdr->__ifi_pad = 0;
        hdr->ifi_type = dev->type;
        hdr->ifi_index = dev->ifindex;
        hdr->ifi_flags = dev_get_flags(dev);
        hdr->ifi_change = 0;
 
        NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
 
        if (dev->addr_len)
                NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
 
        NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
        if (dev->ifindex != dev->iflink)
                NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
 
        protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
        if (protoinfo == NULL)
                goto nla_put_failure;
 
        NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
 
        ci.max_reasm_len = IPV6_MAXPLEN;
        ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
                    + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
        ci.reachable_time = idev->nd_parms->reachable_time;
        ci.retrans_time = idev->nd_parms->retrans_time;
        NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
 
        nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
        if (nla == NULL)
                goto nla_put_failure;
        ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
 
        /* XXX - MC not implemented */
 
        nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
        if (nla == NULL)
                goto nla_put_failure;
        snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
 
        nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
        if (nla == NULL)
                goto nla_put_failure;
        snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
 
        nla_nest_end(skb, protoinfo);
        return nlmsg_end(skb, nlh);
 
nla_put_failure:
        nlmsg_cancel(skb, nlh);
        return -EMSGSIZE;
}
 
static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
{
        int idx, err;
        int s_idx = cb->args[0];
        struct net_device *dev;
        struct inet6_dev *idev;
 
        read_lock(&dev_base_lock);
        idx = 0;
        for_each_netdev(&init_net, dev) {
                if (idx < s_idx)
                        goto cont;
                if ((idev = in6_dev_get(dev)) == NULL)
                        goto cont;
                err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
                                cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
                in6_dev_put(idev);
                if (err <= 0)
                        break;
cont:
                idx++;
        }
        read_unlock(&dev_base_lock);
        cb->args[0] = idx;
 
        return skb->len;
}
 
void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
{
        struct sk_buff *skb;
        int err = -ENOBUFS;
 
        skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
        if (skb == NULL)
                goto errout;
 
        err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
        if (err < 0) {
                /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
                WARN_ON(err == -EMSGSIZE);
                kfree_skb(skb);
                goto errout;
        }
        err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
errout:
        if (err < 0)
                rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
}
 
static inline size_t inet6_prefix_nlmsg_size(void)
{
        return NLMSG_ALIGN(sizeof(struct prefixmsg))
               + nla_total_size(sizeof(struct in6_addr))
               + nla_total_size(sizeof(struct prefix_cacheinfo));
}
 
static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
                             struct prefix_info *pinfo, u32 pid, u32 seq,
                             int event, unsigned int flags)
{
        struct prefixmsg *pmsg;
        struct nlmsghdr *nlh;
        struct prefix_cacheinfo ci;
 
        nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
        if (nlh == NULL)
                return -EMSGSIZE;
 
        pmsg = nlmsg_data(nlh);
        pmsg->prefix_family = AF_INET6;
        pmsg->prefix_pad1 = 0;
        pmsg->prefix_pad2 = 0;
        pmsg->prefix_ifindex = idev->dev->ifindex;
        pmsg->prefix_len = pinfo->prefix_len;
        pmsg->prefix_type = pinfo->type;
        pmsg->prefix_pad3 = 0;
        pmsg->prefix_flags = 0;
        if (pinfo->onlink)
                pmsg->prefix_flags |= IF_PREFIX_ONLINK;
        if (pinfo->autoconf)
                pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
 
        NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
 
        ci.preferred_time = ntohl(pinfo->prefered);
        ci.valid_time = ntohl(pinfo->valid);
        NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
 
        return nlmsg_end(skb, nlh);
 
nla_put_failure:
        nlmsg_cancel(skb, nlh);
        return -EMSGSIZE;
}
 
static void inet6_prefix_notify(int event, struct inet6_dev *idev,
                         struct prefix_info *pinfo)
{
        struct sk_buff *skb;
        int err = -ENOBUFS;
 
        skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
        if (skb == NULL)
                goto errout;
 
        err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
        if (err < 0) {
                /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
                WARN_ON(err == -EMSGSIZE);
                kfree_skb(skb);
                goto errout;
        }
        err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
errout:
        if (err < 0)
                rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
}
 
static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
{
        inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
 
        switch (event) {
        case RTM_NEWADDR:
                /*
                 * If the address was optimistic
                 * we inserted the route at the start of
                 * our DAD process, so we don't need
                 * to do it again
                 */
                if (!(ifp->rt->rt6i_node))
                        ip6_ins_rt(ifp->rt);
                if (ifp->idev->cnf.forwarding)
                        addrconf_join_anycast(ifp);
                break;
        case RTM_DELADDR:
                if (ifp->idev->cnf.forwarding)
                        addrconf_leave_anycast(ifp);
                addrconf_leave_solict(ifp->idev, &ifp->addr);
                dst_hold(&ifp->rt->u.dst);
                if (ip6_del_rt(ifp->rt))
                        dst_free(&ifp->rt->u.dst);
                break;
        }
}
 
static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
{
        rcu_read_lock_bh();
        if (likely(ifp->idev->dead == 0))
                __ipv6_ifa_notify(event, ifp);
        rcu_read_unlock_bh();
}
 
#ifdef CONFIG_SYSCTL
 
static
int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
                           void __user *buffer, size_t *lenp, loff_t *ppos)
{
        int *valp = ctl->data;
        int val = *valp;
        int ret;
 
        ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
 
        if (write && valp != &ipv6_devconf_dflt.forwarding) {
                if (valp != &ipv6_devconf.forwarding) {
                        if ((!*valp) ^ (!val)) {
                                struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
                                if (idev == NULL)
                                        return ret;
                                dev_forward_change(idev);
                        }
                } else {
                        ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
                        addrconf_forward_change();
                }
                if (*valp)
                        rt6_purge_dflt_routers();
        }
 
        return ret;
}
 
static int addrconf_sysctl_forward_strategy(ctl_table *table,
                                            int __user *name, int nlen,
                                            void __user *oldval,
                                            size_t __user *oldlenp,
                                            void __user *newval, size_t newlen)
{
        int *valp = table->data;
        int new;
 
        if (!newval || !newlen)
                return 0;
        if (newlen != sizeof(int))
                return -EINVAL;
        if (get_user(new, (int __user *)newval))
                return -EFAULT;
        if (new == *valp)
                return 0;
        if (oldval && oldlenp) {
                size_t len;
                if (get_user(len, oldlenp))
                        return -EFAULT;
                if (len) {
                        if (len > table->maxlen)
                                len = table->maxlen;
                        if (copy_to_user(oldval, valp, len))
                                return -EFAULT;
                        if (put_user(len, oldlenp))
                                return -EFAULT;
                }
        }
 
        if (valp != &ipv6_devconf_dflt.forwarding) {
                if (valp != &ipv6_devconf.forwarding) {
                        struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
                        int changed;
                        if (unlikely(idev == NULL))
                                return -ENODEV;
                        changed = (!*valp) ^ (!new);
                        *valp = new;
                        if (changed)
                                dev_forward_change(idev);
                } else {
                        *valp = new;
                        addrconf_forward_change();
                }
 
                if (*valp)
                        rt6_purge_dflt_routers();
        } else
                *valp = new;
 
        return 1;
}
 
static struct addrconf_sysctl_table
{
        struct ctl_table_header *sysctl_header;
        ctl_table addrconf_vars[__NET_IPV6_MAX];
        ctl_table addrconf_dev[2];
        ctl_table addrconf_conf_dir[2];
        ctl_table addrconf_proto_dir[2];
        ctl_table addrconf_root_dir[2];
} addrconf_sysctl __read_mostly = {
        .sysctl_header = NULL,
        .addrconf_vars = {
                {
                        .ctl_name       =       NET_IPV6_FORWARDING,
                        .procname       =       "forwarding",
                        .data           =       &ipv6_devconf.forwarding,
                        .maxlen         =       sizeof(int),
                        .mode           =       0644,
                        .proc_handler   =       &addrconf_sysctl_forward,
                        .strategy       =       &addrconf_sysctl_forward_strategy,
                },
                {
                        .ctl_name       =       NET_IPV6_HOP_LIMIT,
                        .procname       =       "hop_limit",
                        .data           =       &ipv6_devconf.hop_limit,
                        .maxlen         =       sizeof(int),
                        .mode           =       0644,
                        .proc_handler   =       proc_dointvec,
                },
                {
                        .ctl_name       =       NET_IPV6_MTU,
                        .procname       =       "mtu",
                        .data           =       &ipv6_devconf.mtu6,
                        .maxlen         =       sizeof(int),
                        .mode           =       0644,
                        .proc_handler   =       &proc_dointvec,
                },
                {
                        .ctl_name       =       NET_IPV6_ACCEPT_RA,
                        .procname       =       "accept_ra",
                        .data           =       &ipv6_devconf.accept_ra,
                        .maxlen         =       sizeof(int),
                        .mode           =       0644,
                        .proc_handler   =       &proc_dointvec,
                },
                {
                        .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
                        .procname       =       "accept_redirects",
                        .data           =       &ipv6_devconf.accept_redirects,
                        .maxlen         =       sizeof(int),
                        .mode           =       0644,
                        .proc_handler   =       &proc_dointvec,
                },
                {
                        .ctl_name       =       NET_IPV6_AUTOCONF,
                        .procname       =       "autoconf",
                        .data           =       &ipv6_devconf.autoconf,
                        .maxlen         =       sizeof(int),
                        .mode           =       0644,
                        .proc_handler   =       &proc_dointvec,
                },
                {
                        .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
                        .procname       =       "dad_transmits",
                        .data           =       &ipv6_devconf.dad_transmits,
                        .maxlen         =       sizeof(int),
                        .mode           =       0644,
                        .proc_handler   =       &proc_dointvec,
                },
                {
                        .ctl_name       =       NET_IPV6_RTR_SOLICITS,
                        .procname       =       "router_solicitations",
                        .data           =       &ipv6_devconf.rtr_solicits,
                        .maxlen         =       sizeof(int),
                        .mode           =       0644,
                        .proc_handler   =       &proc_dointvec,
                },
                {
                        .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
                        .procname       =       "router_solicitation_interval",
                        .data           =       &ipv6_devconf.rtr_solicit_interval,
                        .maxlen         =       sizeof(int),
                        .mode           =       0644,
                        .proc_handler   =       &proc_dointvec_jiffies,
                        .strategy       =       &sysctl_jiffies,
                },
                {
                        .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
                        .procname       =       "router_solicitation_delay",
                        .data           =       &ipv6_devconf.rtr_solicit_delay,
                        .maxlen         =       sizeof(int),
                        .mode           =       0644,
                        .proc_handler   =       &proc_dointvec_jiffies,
                        .strategy       =       &sysctl_jiffies,
                },
                {
                        .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
                        .procname       =       "force_mld_version",
                        .data           =       &ipv6_devconf.force_mld_version,
                        .maxlen         =       sizeof(int),
                        .mode           =       0644,
                        .proc_handler   =       &proc_dointvec,
                },
#ifdef CONFIG_IPV6_PRIVACY
                {
                        .ctl_name       =       NET_IPV6_USE_TEMPADDR,
                        .procname       =       "use_tempaddr",
                        .data           =       &ipv6_devconf.use_tempaddr,
                        .maxlen         =       sizeof(int),
                        .mode           =       0644,
                        .proc_handler   =       &proc_dointvec,
                },
                {
                        .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
                        .procname       =       "temp_valid_lft",
                        .data           =       &ipv6_devconf.temp_valid_lft,
                        .maxlen         =       sizeof(int),
                        .mode           =       0644,
                        .proc_handler   =       &proc_dointvec,
                },
                {
                        .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
                        .procname       =       "temp_prefered_lft",
                        .data           =       &ipv6_devconf.temp_prefered_lft,
                        .maxlen         =       sizeof(int),
                        .mode           =       0644,
                        .proc_handler   =       &proc_dointvec,
                },
                {
                        .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
                        .procname       =       "regen_max_retry",
                        .data           =       &ipv6_devconf.regen_max_retry,
                        .maxlen         =       sizeof(int),
                        .mode           =       0644,
                        .proc_handler   =       &proc_dointvec,
                },
                {
                        .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
                        .procname       =       "max_desync_factor",
                        .data           =       &ipv6_devconf.max_desync_factor,
                        .maxlen         =       sizeof(int),
                        .mode           =       0644,
                        .proc_handler   =       &proc_dointvec,
                },
#endif
                {
                        .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
                        .procname       =       "max_addresses",
                        .data           =       &ipv6_devconf.max_addresses,
                        .maxlen         =       sizeof(int),
                        .mode           =       0644,
                        .proc_handler   =       &proc_dointvec,
                },
                {
                        .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
                        .procname       =       "accept_ra_defrtr",
                        .data           =       &ipv6_devconf.accept_ra_defrtr,
                        .maxlen         =       sizeof(int),
                        .mode           =       0644,
                        .proc_handler   =       &proc_dointvec,
                },
                {
                        .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
                        .procname       =       "accept_ra_pinfo",
                        .data           =       &ipv6_devconf.accept_ra_pinfo,
                        .maxlen         =       sizeof(int),
                        .mode           =       0644,
                        .proc_handler   =       &proc_dointvec,
                },
#ifdef CONFIG_IPV6_ROUTER_PREF
                {
                        .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
                        .procname       =       "accept_ra_rtr_pref",
                        .data           =       &ipv6_devconf.accept_ra_rtr_pref,
                        .maxlen         =       sizeof(int),
                        .mode           =       0644,
                        .proc_handler   =       &proc_dointvec,
                },
                {
                        .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
                        .procname       =       "router_probe_interval",
                        .data           =       &ipv6_devconf.rtr_probe_interval,
                        .maxlen         =       sizeof(int),
                        .mode           =       0644,
                        .proc_handler   =       &proc_dointvec_jiffies,
                        .strategy       =       &sysctl_jiffies,
                },
#ifdef CONFIG_IPV6_ROUTE_INFO
                {
                        .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
                        .procname       =       "accept_ra_rt_info_max_plen",
                        .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
                        .maxlen         =       sizeof(int),
                        .mode           =       0644,
                        .proc_handler   =       &proc_dointvec,
                },
#endif
#endif
                {
                        .ctl_name       =       NET_IPV6_PROXY_NDP,
                        .procname       =       "proxy_ndp",
                        .data           =       &ipv6_devconf.proxy_ndp,
                        .maxlen         =       sizeof(int),
                        .mode           =       0644,
                        .proc_handler   =       &proc_dointvec,
                },
                {
                        .ctl_name       =       NET_IPV6_ACCEPT_SOURCE_ROUTE,
                        .procname       =       "accept_source_route",
                        .data           =       &ipv6_devconf.accept_source_route,
                        .maxlen         =       sizeof(int),
                        .mode           =       0644,
                        .proc_handler   =       &proc_dointvec,
                },
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
                {
                        .ctl_name       =       CTL_UNNUMBERED,
                        .procname       =       "optimistic_dad",
                        .data           =       &ipv6_devconf.optimistic_dad,
                        .maxlen         =       sizeof(int),
                        .mode           =       0644,
                        .proc_handler   =       &proc_dointvec,
 
                },
#endif
                {
                        .ctl_name       =       0,       /* sentinel */
                }
        },
        .addrconf_dev = {
                {
                        .ctl_name       =       NET_PROTO_CONF_ALL,
                        .procname       =       "all",
                        .mode           =       0555,
                        .child          =       addrconf_sysctl.addrconf_vars,
                },
                {
                        .ctl_name       =       0,       /* sentinel */
                }
        },
        .addrconf_conf_dir = {
                {
                        .ctl_name       =       NET_IPV6_CONF,
                        .procname       =       "conf",
                        .mode           =       0555,
                        .child          =       addrconf_sysctl.addrconf_dev,
                },
                {
                        .ctl_name       =       0,       /* sentinel */
                }
        },
        .addrconf_proto_dir = {
                {
                        .ctl_name       =       NET_IPV6,
                        .procname       =       "ipv6",
                        .mode           =       0555,
                        .child          =       addrconf_sysctl.addrconf_conf_dir,
                },
                {
                        .ctl_name       =       0,       /* sentinel */
                }
        },
        .addrconf_root_dir = {
                {
                        .ctl_name       =       CTL_NET,
                        .procname       =       "net",
                        .mode           =       0555,
                        .child          =       addrconf_sysctl.addrconf_proto_dir,
                },
                {
                        .ctl_name       =       0,       /* sentinel */
                }
        },
};
 
static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
{
        int i;
        struct net_device *dev = idev ? idev->dev : NULL;
        struct addrconf_sysctl_table *t;
        char *dev_name = NULL;
 
        t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
        if (t == NULL)
                return;
        for (i=0; t->addrconf_vars[i].data; i++) {
                t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
                t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
        }
        if (dev) {
                dev_name = dev->name;
                t->addrconf_dev[0].ctl_name = dev->ifindex;
        } else {
                dev_name = "default";
                t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
        }
 
        /*
         * Make a copy of dev_name, because '.procname' is regarded as const
         * by sysctl and we wouldn't want anyone to change it under our feet
         * (see SIOCSIFNAME).
         */
        dev_name = kstrdup(dev_name, GFP_KERNEL);
        if (!dev_name)
            goto free;
 
        t->addrconf_dev[0].procname = dev_name;
 
        t->addrconf_dev[0].child = t->addrconf_vars;
        t->addrconf_conf_dir[0].child = t->addrconf_dev;
        t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
        t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
 
        t->sysctl_header = register_sysctl_table(t->addrconf_root_dir);
        if (t->sysctl_header == NULL)
                goto free_procname;
        else
                p->sysctl = t;
        return;
 
        /* error path */
 free_procname:
        kfree(dev_name);
 free:
        kfree(t);
 
        return;
}
 
static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
{
        if (p->sysctl) {
                struct addrconf_sysctl_table *t = p->sysctl;
                p->sysctl = NULL;
                unregister_sysctl_table(t->sysctl_header);
                kfree(t->addrconf_dev[0].procname);
                kfree(t);
        }
}
 
 
#endif
 
/*
 *      Device notifier
 */
 
int register_inet6addr_notifier(struct notifier_block *nb)
{
        return atomic_notifier_chain_register(&inet6addr_chain, nb);
}
 
EXPORT_SYMBOL(register_inet6addr_notifier);
 
int unregister_inet6addr_notifier(struct notifier_block *nb)
{
        return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
}
 
EXPORT_SYMBOL(unregister_inet6addr_notifier);
 
/*
 *      Init / cleanup code
 */
 
int __init addrconf_init(void)
{
        int err = 0;
 
        /* The addrconf netdev notifier requires that loopback_dev
         * has it's ipv6 private information allocated and setup
         * before it can bring up and give link-local addresses
         * to other devices which are up.
         *
         * Unfortunately, loopback_dev is not necessarily the first
         * entry in the global dev_base list of net devices.  In fact,
         * it is likely to be the very last entry on that list.
         * So this causes the notifier registry below to try and
         * give link-local addresses to all devices besides loopback_dev
         * first, then loopback_dev, which cases all the non-loopback_dev
         * devices to fail to get a link-local address.
         *
         * So, as a temporary fix, allocate the ipv6 structure for
         * loopback_dev first by hand.
         * Longer term, all of the dependencies ipv6 has upon the loopback
         * device and it being up should be removed.
         */
        rtnl_lock();
        if (!ipv6_add_dev(init_net.loopback_dev))
                err = -ENOMEM;
        rtnl_unlock();
        if (err)
                return err;
 
        ip6_null_entry.u.dst.dev = init_net.loopback_dev;
        ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
        ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
        ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
        ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
        ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
#endif
 
        register_netdevice_notifier(&ipv6_dev_notf);
 
        addrconf_verify(0);
 
        err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
        if (err < 0)
                goto errout;
 
        /* Only the first call to __rtnl_register can fail */
        __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
        __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
        __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
        __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
        __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
 
#ifdef CONFIG_SYSCTL
        addrconf_sysctl.sysctl_header =
                register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
        addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
#endif
 
        return 0;
errout:
        unregister_netdevice_notifier(&ipv6_dev_notf);
 
        return err;
}
 
void __exit addrconf_cleanup(void)
{
        struct net_device *dev;
        struct inet6_ifaddr *ifa;
        int i;
 
        unregister_netdevice_notifier(&ipv6_dev_notf);
 
#ifdef CONFIG_SYSCTL
        addrconf_sysctl_unregister(&ipv6_devconf_dflt);
        addrconf_sysctl_unregister(&ipv6_devconf);
#endif
 
        rtnl_lock();
 
        /*
         *      clean dev list.
         */
 
        for_each_netdev(&init_net, dev) {
                if (__in6_dev_get(dev) == NULL)
                        continue;
                addrconf_ifdown(dev, 1);
        }
        addrconf_ifdown(init_net.loopback_dev, 2);
 
        /*
         *      Check hash table.
         */
 
        write_lock_bh(&addrconf_hash_lock);
        for (i=0; i < IN6_ADDR_HSIZE; i++) {
                for (ifa=inet6_addr_lst[i]; ifa; ) {
                        struct inet6_ifaddr *bifa;
 
                        bifa = ifa;
                        ifa = ifa->lst_next;
                        printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
                        /* Do not free it; something is wrong.
                           Now we can investigate it with debugger.
                         */
                }
        }
        write_unlock_bh(&addrconf_hash_lock);
 
        del_timer(&addr_chk_timer);
 
        rtnl_unlock();
}
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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [net/] [ipv6/] [addrconf.c] - Blame information for rev 3

Line No.	Rev	Author	Line
1	3	xianfeng	`/*`
2			`* IPv6 Address [auto]configuration`
3			`* Linux INET6 implementation`
4			`*`
5			`* Authors:`
6			`* Pedro Roque <roque@di.fc.ul.pt>`
7			`* Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>`
8			`*`
9			`* $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $`
10			`*`
11			`* This program is free software; you can redistribute it and/or`
12			`* modify it under the terms of the GNU General Public License`
13			`* as published by the Free Software Foundation; either version`
14			`* 2 of the License, or (at your option) any later version.`
15			`*/`
16
17			`/*`
18			`* Changes:`
19			`*`
20			`* Janos Farkas : delete timer on ifdown`
21			`* <chexum@bankinf.banki.hu>`
22			`* Andi Kleen : kill double kfree on module`
23			`* unload.`
24			`* Maciej W. Rozycki : FDDI support`
25			`* sekiya@USAGI : Don't send too many RS`
26			`* packets.`
27			`* yoshfuji@USAGI : Fixed interval between DAD`
28			`* packets.`
29			`* YOSHIFUJI Hideaki @USAGI : improved accuracy of`
30			`* address validation timer.`
31			`* YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)`
32			`* support.`
33			`* Yuji SEKIYA @USAGI : Don't assign a same IPv6`
34			`* address on a same interface.`
35			`* YOSHIFUJI Hideaki @USAGI : ARCnet support`
36			`* YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to`
37			`* seq_file.`
38			`* YOSHIFUJI Hideaki @USAGI : improved source address`
39			`* selection; consider scope,`
40			`* status etc.`