/*
 * INET         An implementation of the TCP/IP protocol suite for the LINUX
 *              operating system.  INET is implemented using the  BSD Socket
 *              interface as the means of communication with the user level.
 *
 *              Routing netlink socket interface: protocol independent part.
 *
 * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 *
 *      Fixes:
 *      Vitaly E. Lavrov                RTA_OK arithmetics was wrong.
 */

#include <linux/errno.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/capability.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/security.h>
#include <linux/mutex.h>
#include <linux/if_addr.h>
#include <linux/if_bridge.h>
#include <linux/pci.h>
#include <linux/etherdevice.h>

#include <asm/uaccess.h>

#include <linux/inet.h>
#include <linux/netdevice.h>
#include <net/ip.h>
#include <net/protocol.h>
#include <net/arp.h>
#include <net/route.h>
#include <net/udp.h>
#include <net/sock.h>
#include <net/pkt_sched.h>
#include <net/fib_rules.h>
#include <net/rtnetlink.h>
#include <net/net_namespace.h>

struct rtnl_link {
        rtnl_doit_func          doit;
        rtnl_dumpit_func        dumpit;
        rtnl_calcit_func        calcit;
};

static DEFINE_MUTEX(rtnl_mutex);

void rtnl_lock(void)
{
        mutex_lock(&rtnl_mutex);
}
EXPORT_SYMBOL(rtnl_lock);

void __rtnl_unlock(void)
{
        mutex_unlock(&rtnl_mutex);
}

void rtnl_unlock(void)
{
        /* This fellow will unlock it for us. */
        netdev_run_todo();
}
EXPORT_SYMBOL(rtnl_unlock);

int rtnl_trylock(void)
{
        return mutex_trylock(&rtnl_mutex);
}
EXPORT_SYMBOL(rtnl_trylock);

int rtnl_is_locked(void)
{
        return mutex_is_locked(&rtnl_mutex);
}
EXPORT_SYMBOL(rtnl_is_locked);

#ifdef CONFIG_PROVE_LOCKING
int lockdep_rtnl_is_held(void)
{
        return lockdep_is_held(&rtnl_mutex);
}
EXPORT_SYMBOL(lockdep_rtnl_is_held);
#endif /* #ifdef CONFIG_PROVE_LOCKING */

static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];

static inline int rtm_msgindex(int msgtype)
{
        int msgindex = msgtype - RTM_BASE;

        /*
         * msgindex < 0 implies someone tried to register a netlink
         * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
         * the message type has not been added to linux/rtnetlink.h
         */
        BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);

        return msgindex;
}

static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
{
        struct rtnl_link *tab;

        if (protocol <= RTNL_FAMILY_MAX)
                tab = rtnl_msg_handlers[protocol];
        else
                tab = NULL;

        if (tab == NULL || tab[msgindex].doit == NULL)
                tab = rtnl_msg_handlers[PF_UNSPEC];

        return tab[msgindex].doit;
}

static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
{
        struct rtnl_link *tab;

        if (protocol <= RTNL_FAMILY_MAX)
                tab = rtnl_msg_handlers[protocol];
        else
                tab = NULL;

        if (tab == NULL || tab[msgindex].dumpit == NULL)
                tab = rtnl_msg_handlers[PF_UNSPEC];

        return tab[msgindex].dumpit;
}

static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex)
{
        struct rtnl_link *tab;

        if (protocol <= RTNL_FAMILY_MAX)
                tab = rtnl_msg_handlers[protocol];
        else
                tab = NULL;

        if (tab == NULL || tab[msgindex].calcit == NULL)
                tab = rtnl_msg_handlers[PF_UNSPEC];

        return tab[msgindex].calcit;
}

/**
 * __rtnl_register - Register a rtnetlink message type
 * @protocol: Protocol family or PF_UNSPEC
 * @msgtype: rtnetlink message type
 * @doit: Function pointer called for each request message
 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
 * @calcit: Function pointer to calc size of dump message
 *
 * Registers the specified function pointers (at least one of them has
 * to be non-NULL) to be called whenever a request message for the
 * specified protocol family and message type is received.
 *
 * The special protocol family PF_UNSPEC may be used to define fallback
 * function pointers for the case when no entry for the specific protocol
 * family exists.
 *
 * Returns 0 on success or a negative error code.
 */
int __rtnl_register(int protocol, int msgtype,
                    rtnl_doit_func doit, rtnl_dumpit_func dumpit,
                    rtnl_calcit_func calcit)
{
        struct rtnl_link *tab;
        int msgindex;

        BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
        msgindex = rtm_msgindex(msgtype);

        tab = rtnl_msg_handlers[protocol];
        if (tab == NULL) {
                tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
                if (tab == NULL)
                        return -ENOBUFS;

                rtnl_msg_handlers[protocol] = tab;
        }

        if (doit)
                tab[msgindex].doit = doit;

        if (dumpit)
                tab[msgindex].dumpit = dumpit;

        if (calcit)
                tab[msgindex].calcit = calcit;

        return 0;
}
EXPORT_SYMBOL_GPL(__rtnl_register);

/**
 * rtnl_register - Register a rtnetlink message type
 *
 * Identical to __rtnl_register() but panics on failure. This is useful
 * as failure of this function is very unlikely, it can only happen due
 * to lack of memory when allocating the chain to store all message
 * handlers for a protocol. Meant for use in init functions where lack
 * of memory implies no sense in continuing.
 */
void rtnl_register(int protocol, int msgtype,
                   rtnl_doit_func doit, rtnl_dumpit_func dumpit,
                   rtnl_calcit_func calcit)
{
        if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0)
                panic("Unable to register rtnetlink message handler, "
                      "protocol = %d, message type = %d\n",
                      protocol, msgtype);
}
EXPORT_SYMBOL_GPL(rtnl_register);

/**
 * rtnl_unregister - Unregister a rtnetlink message type
 * @protocol: Protocol family or PF_UNSPEC
 * @msgtype: rtnetlink message type
 *
 * Returns 0 on success or a negative error code.
 */
int rtnl_unregister(int protocol, int msgtype)
{
        int msgindex;

        BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
        msgindex = rtm_msgindex(msgtype);

        if (rtnl_msg_handlers[protocol] == NULL)
                return -ENOENT;

        rtnl_msg_handlers[protocol][msgindex].doit = NULL;
        rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;

        return 0;
}
EXPORT_SYMBOL_GPL(rtnl_unregister);

/**
 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
 * @protocol : Protocol family or PF_UNSPEC
 *
 * Identical to calling rtnl_unregster() for all registered message types
 * of a certain protocol family.
 */
void rtnl_unregister_all(int protocol)
{
        BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);

        kfree(rtnl_msg_handlers[protocol]);
        rtnl_msg_handlers[protocol] = NULL;
}
EXPORT_SYMBOL_GPL(rtnl_unregister_all);

static LIST_HEAD(link_ops);

static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
{
        const struct rtnl_link_ops *ops;

        list_for_each_entry(ops, &link_ops, list) {
                if (!strcmp(ops->kind, kind))
                        return ops;
        }
        return NULL;
}

/**
 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 * @ops: struct rtnl_link_ops * to register
 *
 * The caller must hold the rtnl_mutex. This function should be used
 * by drivers that create devices during module initialization. It
 * must be called before registering the devices.
 *
 * Returns 0 on success or a negative error code.
 */
int __rtnl_link_register(struct rtnl_link_ops *ops)
{
        if (rtnl_link_ops_get(ops->kind))
                return -EEXIST;

        if (!ops->dellink)
                ops->dellink = unregister_netdevice_queue;

        list_add_tail(&ops->list, &link_ops);
        return 0;
}
EXPORT_SYMBOL_GPL(__rtnl_link_register);

/**
 * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 * @ops: struct rtnl_link_ops * to register
 *
 * Returns 0 on success or a negative error code.
 */
int rtnl_link_register(struct rtnl_link_ops *ops)
{
        int err;

        rtnl_lock();
        err = __rtnl_link_register(ops);
        rtnl_unlock();
        return err;
}
EXPORT_SYMBOL_GPL(rtnl_link_register);

static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
{
        struct net_device *dev;
        LIST_HEAD(list_kill);

        for_each_netdev(net, dev) {
                if (dev->rtnl_link_ops == ops)
                        ops->dellink(dev, &list_kill);
        }
        unregister_netdevice_many(&list_kill);
}

/**
 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 * @ops: struct rtnl_link_ops * to unregister
 *
 * The caller must hold the rtnl_mutex.
 */
void __rtnl_link_unregister(struct rtnl_link_ops *ops)
{
        struct net *net;

        for_each_net(net) {
                __rtnl_kill_links(net, ops);
        }
        list_del(&ops->list);
}
EXPORT_SYMBOL_GPL(__rtnl_link_unregister);

/**
 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 * @ops: struct rtnl_link_ops * to unregister
 */
void rtnl_link_unregister(struct rtnl_link_ops *ops)
{
        rtnl_lock();
        __rtnl_link_unregister(ops);
        rtnl_unlock();
}
EXPORT_SYMBOL_GPL(rtnl_link_unregister);

static size_t rtnl_link_get_size(const struct net_device *dev)
{
        const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
        size_t size;

        if (!ops)
                return 0;

        size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
               nla_total_size(strlen(ops->kind) + 1);  /* IFLA_INFO_KIND */

        if (ops->get_size)
                /* IFLA_INFO_DATA + nested data */
                size += nla_total_size(sizeof(struct nlattr)) +
                        ops->get_size(dev);

        if (ops->get_xstats_size)
                /* IFLA_INFO_XSTATS */
                size += nla_total_size(ops->get_xstats_size(dev));

        return size;
}

static LIST_HEAD(rtnl_af_ops);

static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
{
        const struct rtnl_af_ops *ops;

        list_for_each_entry(ops, &rtnl_af_ops, list) {
                if (ops->family == family)
                        return ops;
        }

        return NULL;
}

/**
 * __rtnl_af_register - Register rtnl_af_ops with rtnetlink.
 * @ops: struct rtnl_af_ops * to register
 *
 * The caller must hold the rtnl_mutex.
 *
 * Returns 0 on success or a negative error code.
 */
int __rtnl_af_register(struct rtnl_af_ops *ops)
{
        list_add_tail(&ops->list, &rtnl_af_ops);
        return 0;
}
EXPORT_SYMBOL_GPL(__rtnl_af_register);

/**
 * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
 * @ops: struct rtnl_af_ops * to register
 *
 * Returns 0 on success or a negative error code.
 */
int rtnl_af_register(struct rtnl_af_ops *ops)
{
        int err;

        rtnl_lock();
        err = __rtnl_af_register(ops);
        rtnl_unlock();
        return err;
}
EXPORT_SYMBOL_GPL(rtnl_af_register);

/**
 * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 * @ops: struct rtnl_af_ops * to unregister
 *
 * The caller must hold the rtnl_mutex.
 */
void __rtnl_af_unregister(struct rtnl_af_ops *ops)
{
        list_del(&ops->list);
}
EXPORT_SYMBOL_GPL(__rtnl_af_unregister);

/**
 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 * @ops: struct rtnl_af_ops * to unregister
 */
void rtnl_af_unregister(struct rtnl_af_ops *ops)
{
        rtnl_lock();
        __rtnl_af_unregister(ops);
        rtnl_unlock();
}
EXPORT_SYMBOL_GPL(rtnl_af_unregister);

static size_t rtnl_link_get_af_size(const struct net_device *dev)
{
        struct rtnl_af_ops *af_ops;
        size_t size;

        /* IFLA_AF_SPEC */
        size = nla_total_size(sizeof(struct nlattr));

        list_for_each_entry(af_ops, &rtnl_af_ops, list) {
                if (af_ops->get_link_af_size) {
                        /* AF_* + nested data */
                        size += nla_total_size(sizeof(struct nlattr)) +
                                af_ops->get_link_af_size(dev);
                }
        }

        return size;
}

static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
{
        const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
        struct nlattr *linkinfo, *data;
        int err = -EMSGSIZE;

        linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
        if (linkinfo == NULL)
                goto out;

        if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
                goto err_cancel_link;
        if (ops->fill_xstats) {
                err = ops->fill_xstats(skb, dev);
                if (err < 0)
                        goto err_cancel_link;
        }
        if (ops->fill_info) {
                data = nla_nest_start(skb, IFLA_INFO_DATA);
                if (data == NULL)
                        goto err_cancel_link;
                err = ops->fill_info(skb, dev);
                if (err < 0)
                        goto err_cancel_data;
                nla_nest_end(skb, data);
        }

        nla_nest_end(skb, linkinfo);
        return 0;

err_cancel_data:
        nla_nest_cancel(skb, data);
err_cancel_link:
        nla_nest_cancel(skb, linkinfo);
out:
        return err;
}

static const int rtm_min[RTM_NR_FAMILIES] =
{
        [RTM_FAM(RTM_NEWLINK)]      = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
        [RTM_FAM(RTM_NEWADDR)]      = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
        [RTM_FAM(RTM_NEWROUTE)]     = NLMSG_LENGTH(sizeof(struct rtmsg)),
        [RTM_FAM(RTM_NEWRULE)]      = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
        [RTM_FAM(RTM_NEWQDISC)]     = NLMSG_LENGTH(sizeof(struct tcmsg)),
        [RTM_FAM(RTM_NEWTCLASS)]    = NLMSG_LENGTH(sizeof(struct tcmsg)),
        [RTM_FAM(RTM_NEWTFILTER)]   = NLMSG_LENGTH(sizeof(struct tcmsg)),
        [RTM_FAM(RTM_NEWACTION)]    = NLMSG_LENGTH(sizeof(struct tcamsg)),
        [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
        [RTM_FAM(RTM_GETANYCAST)]   = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
};

static const int rta_max[RTM_NR_FAMILIES] =
{
        [RTM_FAM(RTM_NEWLINK)]      = IFLA_MAX,
        [RTM_FAM(RTM_NEWADDR)]      = IFA_MAX,
        [RTM_FAM(RTM_NEWROUTE)]     = RTA_MAX,
        [RTM_FAM(RTM_NEWRULE)]      = FRA_MAX,
        [RTM_FAM(RTM_NEWQDISC)]     = TCA_MAX,
        [RTM_FAM(RTM_NEWTCLASS)]    = TCA_MAX,
        [RTM_FAM(RTM_NEWTFILTER)]   = TCA_MAX,
        [RTM_FAM(RTM_NEWACTION)]    = TCAA_MAX,
};

int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
{
        struct sock *rtnl = net->rtnl;
        int err = 0;

        NETLINK_CB(skb).dst_group = group;
        if (echo)
                atomic_inc(&skb->users);
        netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
        if (echo)
                err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
        return err;
}

int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
{
        struct sock *rtnl = net->rtnl;

        return nlmsg_unicast(rtnl, skb, pid);
}
EXPORT_SYMBOL(rtnl_unicast);

void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
                 struct nlmsghdr *nlh, gfp_t flags)
{
        struct sock *rtnl = net->rtnl;
        int report = 0;

        if (nlh)
                report = nlmsg_report(nlh);

        nlmsg_notify(rtnl, skb, pid, group, report, flags);
}
EXPORT_SYMBOL(rtnl_notify);

void rtnl_set_sk_err(struct net *net, u32 group, int error)
{
        struct sock *rtnl = net->rtnl;

        netlink_set_err(rtnl, 0, group, error);
}
EXPORT_SYMBOL(rtnl_set_sk_err);

int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
{
        struct nlattr *mx;
        int i, valid = 0;

        mx = nla_nest_start(skb, RTA_METRICS);
        if (mx == NULL)
                return -ENOBUFS;

        for (i = 0; i < RTAX_MAX; i++) {
                if (metrics[i]) {
                        valid++;
                        if (nla_put_u32(skb, i+1, metrics[i]))
                                goto nla_put_failure;
                }
        }

        if (!valid) {
                nla_nest_cancel(skb, mx);
                return 0;
        }

        return nla_nest_end(skb, mx);

nla_put_failure:
        nla_nest_cancel(skb, mx);
        return -EMSGSIZE;
}
EXPORT_SYMBOL(rtnetlink_put_metrics);

int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
                       long expires, u32 error)
{
        struct rta_cacheinfo ci = {
                .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse),
                .rta_used = dst->__use,
                .rta_clntref = atomic_read(&(dst->__refcnt)),
                .rta_error = error,
                .rta_id =  id,
        };

        if (expires) {
                unsigned long clock;

                clock = jiffies_to_clock_t(abs(expires));
                clock = min_t(unsigned long, clock, INT_MAX);
                ci.rta_expires = (expires > 0) ? clock : -clock;
        }
        return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
}
EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);

static void set_operstate(struct net_device *dev, unsigned char transition)
{
        unsigned char operstate = dev->operstate;

        switch (transition) {
        case IF_OPER_UP:
                if ((operstate == IF_OPER_DORMANT ||
                     operstate == IF_OPER_UNKNOWN) &&
                    !netif_dormant(dev))
                        operstate = IF_OPER_UP;
                break;

        case IF_OPER_DORMANT:
                if (operstate == IF_OPER_UP ||
                    operstate == IF_OPER_UNKNOWN)
                        operstate = IF_OPER_DORMANT;
                break;
        }

        if (dev->operstate != operstate) {
                write_lock_bh(&dev_base_lock);
                dev->operstate = operstate;
                write_unlock_bh(&dev_base_lock);
                netdev_state_change(dev);
        }
}

static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
{
        return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
               (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
}

static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
                                           const struct ifinfomsg *ifm)
{
        unsigned int flags = ifm->ifi_flags;

        /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
        if (ifm->ifi_change)
                flags = (flags & ifm->ifi_change) |
                        (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);

        return flags;
}

static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
                                 const struct rtnl_link_stats64 *b)
{
        a->rx_packets = b->rx_packets;
        a->tx_packets = b->tx_packets;
        a->rx_bytes = b->rx_bytes;
        a->tx_bytes = b->tx_bytes;
        a->rx_errors = b->rx_errors;
        a->tx_errors = b->tx_errors;
        a->rx_dropped = b->rx_dropped;
        a->tx_dropped = b->tx_dropped;

        a->multicast = b->multicast;
        a->collisions = b->collisions;

        a->rx_length_errors = b->rx_length_errors;
        a->rx_over_errors = b->rx_over_errors;
        a->rx_crc_errors = b->rx_crc_errors;
        a->rx_frame_errors = b->rx_frame_errors;
        a->rx_fifo_errors = b->rx_fifo_errors;
        a->rx_missed_errors = b->rx_missed_errors;

        a->tx_aborted_errors = b->tx_aborted_errors;
        a->tx_carrier_errors = b->tx_carrier_errors;
        a->tx_fifo_errors = b->tx_fifo_errors;
        a->tx_heartbeat_errors = b->tx_heartbeat_errors;
        a->tx_window_errors = b->tx_window_errors;

        a->rx_compressed = b->rx_compressed;
        a->tx_compressed = b->tx_compressed;
}

static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b)
{
        memcpy(v, b, sizeof(*b));
}

/* All VF info */
static inline int rtnl_vfinfo_size(const struct net_device *dev,
                                   u32 ext_filter_mask)
{
        if (dev->dev.parent && dev_is_pci(dev->dev.parent) &&
            (ext_filter_mask & RTEXT_FILTER_VF)) {
                int num_vfs = dev_num_vf(dev->dev.parent);
                size_t size = nla_total_size(sizeof(struct nlattr));
                size += nla_total_size(num_vfs * sizeof(struct nlattr));
                size += num_vfs *
                        (nla_total_size(sizeof(struct ifla_vf_mac)) +
                         nla_total_size(sizeof(struct ifla_vf_vlan)) +
                         nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
                         nla_total_size(sizeof(struct ifla_vf_spoofchk)));
                return size;
        } else
                return 0;
}

static size_t rtnl_port_size(const struct net_device *dev)
{
        size_t port_size = nla_total_size(4)            /* PORT_VF */
                + nla_total_size(PORT_PROFILE_MAX)      /* PORT_PROFILE */
                + nla_total_size(sizeof(struct ifla_port_vsi))
                                                        /* PORT_VSI_TYPE */
                + nla_total_size(PORT_UUID_MAX)         /* PORT_INSTANCE_UUID */
                + nla_total_size(PORT_UUID_MAX)         /* PORT_HOST_UUID */
                + nla_total_size(1)                     /* PROT_VDP_REQUEST */
                + nla_total_size(2);                    /* PORT_VDP_RESPONSE */
        size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
        size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
                + port_size;
        size_t port_self_size = nla_total_size(sizeof(struct nlattr))
                + port_size;

        if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
                return 0;
        if (dev_num_vf(dev->dev.parent))
                return port_self_size + vf_ports_size +
                        vf_port_size * dev_num_vf(dev->dev.parent);
        else
                return port_self_size;
}

static noinline size_t if_nlmsg_size(const struct net_device *dev,
                                     u32 ext_filter_mask)
{
        return NLMSG_ALIGN(sizeof(struct ifinfomsg))
               + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
               + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
               + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
               + nla_total_size(sizeof(struct rtnl_link_ifmap))
               + nla_total_size(sizeof(struct rtnl_link_stats))
               + nla_total_size(sizeof(struct rtnl_link_stats64))
               + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
               + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
               + nla_total_size(4) /* IFLA_TXQLEN */
               + nla_total_size(4) /* IFLA_WEIGHT */
               + nla_total_size(4) /* IFLA_MTU */
               + nla_total_size(4) /* IFLA_LINK */
               + nla_total_size(4) /* IFLA_MASTER */
               + nla_total_size(4) /* IFLA_PROMISCUITY */
               + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
               + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
               + nla_total_size(1) /* IFLA_OPERSTATE */
               + nla_total_size(1) /* IFLA_LINKMODE */
               + nla_total_size(ext_filter_mask
                                & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
               + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
               + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
               + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
               + rtnl_link_get_af_size(dev); /* IFLA_AF_SPEC */
}

static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
{
        struct nlattr *vf_ports;
        struct nlattr *vf_port;
        int vf;
        int err;

        vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
        if (!vf_ports)
                return -EMSGSIZE;

        for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
                vf_port = nla_nest_start(skb, IFLA_VF_PORT);
                if (!vf_port)
                        goto nla_put_failure;
                if (nla_put_u32(skb, IFLA_PORT_VF, vf))
                        goto nla_put_failure;
                err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
                if (err == -EMSGSIZE)
                        goto nla_put_failure;
                if (err) {
                        nla_nest_cancel(skb, vf_port);
                        continue;
                }
                nla_nest_end(skb, vf_port);
        }

        nla_nest_end(skb, vf_ports);

        return 0;

nla_put_failure:
        nla_nest_cancel(skb, vf_ports);
        return -EMSGSIZE;
}

static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
{
        struct nlattr *port_self;
        int err;

        port_self = nla_nest_start(skb, IFLA_PORT_SELF);
        if (!port_self)
                return -EMSGSIZE;

        err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
        if (err) {
                nla_nest_cancel(skb, port_self);
                return (err == -EMSGSIZE) ? err : 0;
        }

        nla_nest_end(skb, port_self);

        return 0;
}

static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev)
{
        int err;

        if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
                return 0;

        err = rtnl_port_self_fill(skb, dev);
        if (err)
                return err;

        if (dev_num_vf(dev->dev.parent)) {
                err = rtnl_vf_ports_fill(skb, dev);
                if (err)
                        return err;
        }

        return 0;
}

static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
                            int type, u32 pid, u32 seq, u32 change,
                            unsigned int flags, u32 ext_filter_mask)
{
        struct ifinfomsg *ifm;
        struct nlmsghdr *nlh;
        struct rtnl_link_stats64 temp;
        const struct rtnl_link_stats64 *stats;
        struct nlattr *attr, *af_spec;
        struct rtnl_af_ops *af_ops;

        ASSERT_RTNL();
        nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
        if (nlh == NULL)
                return -EMSGSIZE;

        ifm = nlmsg_data(nlh);
        ifm->ifi_family = AF_UNSPEC;
        ifm->__ifi_pad = 0;
        ifm->ifi_type = dev->type;
        ifm->ifi_index = dev->ifindex;
        ifm->ifi_flags = dev_get_flags(dev);
        ifm->ifi_change = change;

        if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
            nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
            nla_put_u8(skb, IFLA_OPERSTATE,
                       netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
            nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
            nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
            nla_put_u32(skb, IFLA_GROUP, dev->group) ||
            nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
            nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
#ifdef CONFIG_RPS
            nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
#endif
            (dev->ifindex != dev->iflink &&
             nla_put_u32(skb, IFLA_LINK, dev->iflink)) ||
            (dev->master &&
             nla_put_u32(skb, IFLA_MASTER, dev->master->ifindex)) ||
            (dev->qdisc &&
             nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
            (dev->ifalias &&
             nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)))
                goto nla_put_failure;

        if (1) {
                struct rtnl_link_ifmap map = {
                        .mem_start   = dev->mem_start,
                        .mem_end     = dev->mem_end,
                        .base_addr   = dev->base_addr,
                        .irq         = dev->irq,
                        .dma         = dev->dma,
                        .port        = dev->if_port,
                };
                if (nla_put(skb, IFLA_MAP, sizeof(map), &map))
                        goto nla_put_failure;
        }

        if (dev->addr_len) {
                if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
                    nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
                        goto nla_put_failure;
        }

        attr = nla_reserve(skb, IFLA_STATS,
                        sizeof(struct rtnl_link_stats));
        if (attr == NULL)
                goto nla_put_failure;

        stats = dev_get_stats(dev, &temp);
        copy_rtnl_link_stats(nla_data(attr), stats);

        attr = nla_reserve(skb, IFLA_STATS64,
                        sizeof(struct rtnl_link_stats64));
        if (attr == NULL)
                goto nla_put_failure;
        copy_rtnl_link_stats64(nla_data(attr), stats);

        if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) &&
            nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)))
                goto nla_put_failure;

        if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent
            && (ext_filter_mask & RTEXT_FILTER_VF)) {
                int i;

                struct nlattr *vfinfo, *vf;
                int num_vfs = dev_num_vf(dev->dev.parent);

                vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
                if (!vfinfo)
                        goto nla_put_failure;
                for (i = 0; i < num_vfs; i++) {
                        struct ifla_vf_info ivi;
                        struct ifla_vf_mac vf_mac;
                        struct ifla_vf_vlan vf_vlan;
                        struct ifla_vf_tx_rate vf_tx_rate;
                        struct ifla_vf_spoofchk vf_spoofchk;

                        /*
                         * Not all SR-IOV capable drivers support the
                         * spoofcheck query.  Preset to -1 so the user
                         * space tool can detect that the driver didn't
                         * report anything.
                         */
                        ivi.spoofchk = -1;
                        if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
                                break;
                        vf_mac.vf =
                                vf_vlan.vf =
                                vf_tx_rate.vf =
                                vf_spoofchk.vf = ivi.vf;

                        memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
                        vf_vlan.vlan = ivi.vlan;
                        vf_vlan.qos = ivi.qos;
                        vf_tx_rate.rate = ivi.tx_rate;
                        vf_spoofchk.setting = ivi.spoofchk;
                        vf = nla_nest_start(skb, IFLA_VF_INFO);
                        if (!vf) {
                                nla_nest_cancel(skb, vfinfo);
                                goto nla_put_failure;
                        }
                        if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
                            nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
                            nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
                                    &vf_tx_rate) ||
                            nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),

                                    &vf_spoofchk))
                                goto nla_put_failure;
                        nla_nest_end(skb, vf);
                }
                nla_nest_end(skb, vfinfo);
        }

        if (rtnl_port_fill(skb, dev))
                goto nla_put_failure;

        if (dev->rtnl_link_ops) {
                if (rtnl_link_fill(skb, dev) < 0)
                        goto nla_put_failure;
        }

        if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
                goto nla_put_failure;

        list_for_each_entry(af_ops, &rtnl_af_ops, list) {
                if (af_ops->fill_link_af) {
                        struct nlattr *af;
                        int err;

                        if (!(af = nla_nest_start(skb, af_ops->family)))
                                goto nla_put_failure;

                        err = af_ops->fill_link_af(skb, dev);

                        /*
                         * Caller may return ENODATA to indicate that there
                         * was no data to be dumped. This is not an error, it
                         * means we should trim the attribute header and
                         * continue.
                         */
                        if (err == -ENODATA)
                                nla_nest_cancel(skb, af);
                        else if (err < 0)
                                goto nla_put_failure;

                        nla_nest_end(skb, af);
                }
        }

        nla_nest_end(skb, af_spec);

        return nlmsg_end(skb, nlh);

nla_put_failure:
        nlmsg_cancel(skb, nlh);
        return -EMSGSIZE;
}

static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
{
        struct net *net = sock_net(skb->sk);
        int h, s_h;
        int idx = 0, s_idx;
        struct net_device *dev;
        struct hlist_head *head;
        struct hlist_node *node;
        struct nlattr *tb[IFLA_MAX+1];
        u32 ext_filter_mask = 0;

        s_h = cb->args[0];
        s_idx = cb->args[1];

        rcu_read_lock();
        cb->seq = net->dev_base_seq;

        if (nlmsg_parse(cb->nlh, sizeof(struct rtgenmsg), tb, IFLA_MAX,
                        ifla_policy) >= 0) {

                if (tb[IFLA_EXT_MASK])
                        ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
        }

        for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
                idx = 0;
                head = &net->dev_index_head[h];
                hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
                        if (idx < s_idx)
                                goto cont;
                        if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
                                             NETLINK_CB(cb->skb).portid,
                                             cb->nlh->nlmsg_seq, 0,
                                             NLM_F_MULTI,
                                             ext_filter_mask) <= 0)
                                goto out;

                        nl_dump_check_consistent(cb, nlmsg_hdr(skb));
cont:
                        idx++;
                }
        }
out:
        rcu_read_unlock();
        cb->args[1] = idx;
        cb->args[0] = h;

        return skb->len;
}

const struct nla_policy ifla_policy[IFLA_MAX+1] = {
        [IFLA_IFNAME]           = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
        [IFLA_ADDRESS]          = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
        [IFLA_BROADCAST]        = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
        [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
        [IFLA_MTU]              = { .type = NLA_U32 },
        [IFLA_LINK]             = { .type = NLA_U32 },
        [IFLA_MASTER]           = { .type = NLA_U32 },
        [IFLA_TXQLEN]           = { .type = NLA_U32 },
        [IFLA_WEIGHT]           = { .type = NLA_U32 },
        [IFLA_OPERSTATE]        = { .type = NLA_U8 },
        [IFLA_LINKMODE]         = { .type = NLA_U8 },
        [IFLA_LINKINFO]         = { .type = NLA_NESTED },
        [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
        [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
        [IFLA_IFALIAS]          = { .type = NLA_STRING, .len = IFALIASZ-1 },
        [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED },
        [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
        [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
        [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
        [IFLA_EXT_MASK]         = { .type = NLA_U32 },
        [IFLA_PROMISCUITY]      = { .type = NLA_U32 },
        [IFLA_NUM_TX_QUEUES]    = { .type = NLA_U32 },
        [IFLA_NUM_RX_QUEUES]    = { .type = NLA_U32 },
};
EXPORT_SYMBOL(ifla_policy);

static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
        [IFLA_INFO_KIND]        = { .type = NLA_STRING },
        [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
};

static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
        [IFLA_VF_INFO]          = { .type = NLA_NESTED },
};

static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
        [IFLA_VF_MAC]           = { .type = NLA_BINARY,
                                    .len = sizeof(struct ifla_vf_mac) },
        [IFLA_VF_VLAN]          = { .type = NLA_BINARY,
                                    .len = sizeof(struct ifla_vf_vlan) },
        [IFLA_VF_TX_RATE]       = { .type = NLA_BINARY,
                                    .len = sizeof(struct ifla_vf_tx_rate) },
        [IFLA_VF_SPOOFCHK]      = { .type = NLA_BINARY,
                                    .len = sizeof(struct ifla_vf_spoofchk) },
};

static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
        [IFLA_PORT_VF]          = { .type = NLA_U32 },
        [IFLA_PORT_PROFILE]     = { .type = NLA_STRING,
                                    .len = PORT_PROFILE_MAX },
        [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
                                    .len = sizeof(struct ifla_port_vsi)},
        [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
                                      .len = PORT_UUID_MAX },
        [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
                                    .len = PORT_UUID_MAX },
        [IFLA_PORT_REQUEST]     = { .type = NLA_U8, },
        [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
};

struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
{
        struct net *net;
        /* Examine the link attributes and figure out which
         * network namespace we are talking about.
         */
        if (tb[IFLA_NET_NS_PID])
                net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
        else if (tb[IFLA_NET_NS_FD])
                net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
        else
                net = get_net(src_net);
        return net;
}
EXPORT_SYMBOL(rtnl_link_get_net);

static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
{
        if (dev) {
                if (tb[IFLA_ADDRESS] &&
                    nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
                        return -EINVAL;

                if (tb[IFLA_BROADCAST] &&
                    nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
                        return -EINVAL;
        }

        if (tb[IFLA_AF_SPEC]) {
                struct nlattr *af;
                int rem, err;

                nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
                        const struct rtnl_af_ops *af_ops;

                        if (!(af_ops = rtnl_af_lookup(nla_type(af))))
                                return -EAFNOSUPPORT;

                        if (!af_ops->set_link_af)
                                return -EOPNOTSUPP;

                        if (af_ops->validate_link_af) {
                                err = af_ops->validate_link_af(dev, af);
                                if (err < 0)
                                        return err;
                        }
                }
        }

        return 0;
}

static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
{
        int rem, err = -EINVAL;
        struct nlattr *vf;
        const struct net_device_ops *ops = dev->netdev_ops;

        nla_for_each_nested(vf, attr, rem) {
                switch (nla_type(vf)) {
                case IFLA_VF_MAC: {
                        struct ifla_vf_mac *ivm;
                        ivm = nla_data(vf);
                        err = -EOPNOTSUPP;
                        if (ops->ndo_set_vf_mac)
                                err = ops->ndo_set_vf_mac(dev, ivm->vf,
                                                          ivm->mac);
                        break;
                }
                case IFLA_VF_VLAN: {
                        struct ifla_vf_vlan *ivv;
                        ivv = nla_data(vf);
                        err = -EOPNOTSUPP;
                        if (ops->ndo_set_vf_vlan)
                                err = ops->ndo_set_vf_vlan(dev, ivv->vf,
                                                           ivv->vlan,
                                                           ivv->qos);
                        break;
                }
                case IFLA_VF_TX_RATE: {
                        struct ifla_vf_tx_rate *ivt;
                        ivt = nla_data(vf);
                        err = -EOPNOTSUPP;
                        if (ops->ndo_set_vf_tx_rate)
                                err = ops->ndo_set_vf_tx_rate(dev, ivt->vf,
                                                              ivt->rate);
                        break;
                }
                case IFLA_VF_SPOOFCHK: {
                        struct ifla_vf_spoofchk *ivs;
                        ivs = nla_data(vf);
                        err = -EOPNOTSUPP;
                        if (ops->ndo_set_vf_spoofchk)
                                err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
                                                               ivs->setting);
                        break;
                }
                default:
                        err = -EINVAL;
                        break;
                }
                if (err)
                        break;
        }
        return err;
}

static int do_set_master(struct net_device *dev, int ifindex)
{
        struct net_device *master_dev;
        const struct net_device_ops *ops;
        int err;

        if (dev->master) {
                if (dev->master->ifindex == ifindex)
                        return 0;
                ops = dev->master->netdev_ops;
                if (ops->ndo_del_slave) {
                        err = ops->ndo_del_slave(dev->master, dev);
                        if (err)
                                return err;
                } else {
                        return -EOPNOTSUPP;
                }
        }

        if (ifindex) {
                master_dev = __dev_get_by_index(dev_net(dev), ifindex);
                if (!master_dev)
                        return -EINVAL;
                ops = master_dev->netdev_ops;
                if (ops->ndo_add_slave) {
                        err = ops->ndo_add_slave(master_dev, dev);
                        if (err)
                                return err;
                } else {
                        return -EOPNOTSUPP;
                }
        }
        return 0;
}

static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
                      struct nlattr **tb, char *ifname, int modified)
{
        const struct net_device_ops *ops = dev->netdev_ops;
        int send_addr_notify = 0;
        int err;

        if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
                struct net *net = rtnl_link_get_net(dev_net(dev), tb);
                if (IS_ERR(net)) {
                        err = PTR_ERR(net);
                        goto errout;
                }
                if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) {
                        err = -EPERM;
                        goto errout;
                }
                err = dev_change_net_namespace(dev, net, ifname);
                put_net(net);
                if (err)
                        goto errout;
                modified = 1;
        }

        if (tb[IFLA_MAP]) {
                struct rtnl_link_ifmap *u_map;
                struct ifmap k_map;

                if (!ops->ndo_set_config) {
                        err = -EOPNOTSUPP;
                        goto errout;
                }

                if (!netif_device_present(dev)) {
                        err = -ENODEV;
                        goto errout;
                }

                u_map = nla_data(tb[IFLA_MAP]);
                k_map.mem_start = (unsigned long) u_map->mem_start;
                k_map.mem_end = (unsigned long) u_map->mem_end;
                k_map.base_addr = (unsigned short) u_map->base_addr;
                k_map.irq = (unsigned char) u_map->irq;
                k_map.dma = (unsigned char) u_map->dma;
                k_map.port = (unsigned char) u_map->port;

                err = ops->ndo_set_config(dev, &k_map);
                if (err < 0)
                        goto errout;

                modified = 1;
        }

        if (tb[IFLA_ADDRESS]) {
                struct sockaddr *sa;
                int len;

                if (!ops->ndo_set_mac_address) {
                        err = -EOPNOTSUPP;
                        goto errout;
                }

                if (!netif_device_present(dev)) {
                        err = -ENODEV;
                        goto errout;
                }

                len = sizeof(sa_family_t) + dev->addr_len;
                sa = kmalloc(len, GFP_KERNEL);
                if (!sa) {
                        err = -ENOMEM;
                        goto errout;
                }
                sa->sa_family = dev->type;
                memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
                       dev->addr_len);
                err = ops->ndo_set_mac_address(dev, sa);
                kfree(sa);
                if (err)
                        goto errout;
                send_addr_notify = 1;
                modified = 1;
                add_device_randomness(dev->dev_addr, dev->addr_len);
        }

        if (tb[IFLA_MTU]) {
                err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
                if (err < 0)
                        goto errout;
                modified = 1;
        }

        if (tb[IFLA_GROUP]) {
                dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
                modified = 1;
        }

        /*
         * Interface selected by interface index but interface
         * name provided implies that a name change has been
         * requested.
         */
        if (ifm->ifi_index > 0 && ifname[0]) {
                err = dev_change_name(dev, ifname);
                if (err < 0)
                        goto errout;
                modified = 1;
        }

        if (tb[IFLA_IFALIAS]) {
                err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
                                    nla_len(tb[IFLA_IFALIAS]));
                if (err < 0)
                        goto errout;
                modified = 1;
        }

        if (tb[IFLA_BROADCAST]) {
                nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
                send_addr_notify = 1;
        }

        if (ifm->ifi_flags || ifm->ifi_change) {
                err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
                if (err < 0)
                        goto errout;
        }

        if (tb[IFLA_MASTER]) {
                err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
                if (err)
                        goto errout;
                modified = 1;
        }

        if (tb[IFLA_TXQLEN])
                dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);

        if (tb[IFLA_OPERSTATE])
                set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));

        if (tb[IFLA_LINKMODE]) {
                write_lock_bh(&dev_base_lock);
                dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
                write_unlock_bh(&dev_base_lock);
        }

        if (tb[IFLA_VFINFO_LIST]) {
                struct nlattr *attr;
                int rem;
                nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
                        if (nla_type(attr) != IFLA_VF_INFO) {
                                err = -EINVAL;
                                goto errout;
                        }
                        err = do_setvfinfo(dev, attr);
                        if (err < 0)
                                goto errout;
                        modified = 1;
                }
        }
        err = 0;

        if (tb[IFLA_VF_PORTS]) {
                struct nlattr *port[IFLA_PORT_MAX+1];
                struct nlattr *attr;
                int vf;
                int rem;

                err = -EOPNOTSUPP;
                if (!ops->ndo_set_vf_port)
                        goto errout;

                nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
                        if (nla_type(attr) != IFLA_VF_PORT)
                                continue;
                        err = nla_parse_nested(port, IFLA_PORT_MAX,
                                attr, ifla_port_policy);
                        if (err < 0)
                                goto errout;
                        if (!port[IFLA_PORT_VF]) {
                                err = -EOPNOTSUPP;
                                goto errout;
                        }
                        vf = nla_get_u32(port[IFLA_PORT_VF]);
                        err = ops->ndo_set_vf_port(dev, vf, port);
                        if (err < 0)
                                goto errout;
                        modified = 1;
                }
        }
        err = 0;

        if (tb[IFLA_PORT_SELF]) {
                struct nlattr *port[IFLA_PORT_MAX+1];

                err = nla_parse_nested(port, IFLA_PORT_MAX,
                        tb[IFLA_PORT_SELF], ifla_port_policy);
                if (err < 0)
                        goto errout;

                err = -EOPNOTSUPP;
                if (ops->ndo_set_vf_port)
                        err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
                if (err < 0)
                        goto errout;
                modified = 1;
        }

        if (tb[IFLA_AF_SPEC]) {
                struct nlattr *af;
                int rem;

                nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
                        const struct rtnl_af_ops *af_ops;

                        if (!(af_ops = rtnl_af_lookup(nla_type(af))))
                                BUG();

                        err = af_ops->set_link_af(dev, af);
                        if (err < 0)
                                goto errout;

                        modified = 1;
                }
        }
        err = 0;

errout:
        if (err < 0 && modified)
                net_warn_ratelimited("A link change request failed with some changes committed already. Interface %s may have been left with an inconsistent configuration, please check.\n",
                                     dev->name);

        if (send_addr_notify)
                call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);

        return err;
}

static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
        struct net *net = sock_net(skb->sk);
        struct ifinfomsg *ifm;
        struct net_device *dev;
        int err;
        struct nlattr *tb[IFLA_MAX+1];
        char ifname[IFNAMSIZ];

        err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
        if (err < 0)
                goto errout;

        if (tb[IFLA_IFNAME])
                nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
        else
                ifname[0] = '\0';

        err = -EINVAL;
        ifm = nlmsg_data(nlh);
        if (ifm->ifi_index > 0)
                dev = __dev_get_by_index(net, ifm->ifi_index);
        else if (tb[IFLA_IFNAME])
                dev = __dev_get_by_name(net, ifname);
        else
                goto errout;

        if (dev == NULL) {
                err = -ENODEV;
                goto errout;
        }

        err = validate_linkmsg(dev, tb);
        if (err < 0)
                goto errout;

        err = do_setlink(dev, ifm, tb, ifname, 0);
errout:
        return err;
}

static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
        struct net *net = sock_net(skb->sk);
        const struct rtnl_link_ops *ops;
        struct net_device *dev;
        struct ifinfomsg *ifm;
        char ifname[IFNAMSIZ];
        struct nlattr *tb[IFLA_MAX+1];
        int err;
        LIST_HEAD(list_kill);

        err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
        if (err < 0)
                return err;

        if (tb[IFLA_IFNAME])
                nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);

        ifm = nlmsg_data(nlh);
        if (ifm->ifi_index > 0)
                dev = __dev_get_by_index(net, ifm->ifi_index);
        else if (tb[IFLA_IFNAME])
                dev = __dev_get_by_name(net, ifname);
        else
                return -EINVAL;

        if (!dev)
                return -ENODEV;

        ops = dev->rtnl_link_ops;
        if (!ops)
                return -EOPNOTSUPP;

        ops->dellink(dev, &list_kill);
        unregister_netdevice_many(&list_kill);
        list_del(&list_kill);
        return 0;
}

int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
{
        unsigned int old_flags;
        int err;

        old_flags = dev->flags;
        if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
                err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
                if (err < 0)
                        return err;
        }

        dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
        rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);

        __dev_notify_flags(dev, old_flags);
        return 0;
}
EXPORT_SYMBOL(rtnl_configure_link);

struct net_device *rtnl_create_link(struct net *net,
        char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
{
        int err;
        struct net_device *dev;
        unsigned int num_tx_queues = 1;
        unsigned int num_rx_queues = 1;

        if (tb[IFLA_NUM_TX_QUEUES])
                num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
        else if (ops->get_num_tx_queues)
                num_tx_queues = ops->get_num_tx_queues();

        if (tb[IFLA_NUM_RX_QUEUES])
                num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
        else if (ops->get_num_rx_queues)
                num_rx_queues = ops->get_num_rx_queues();

        err = -ENOMEM;
        dev = alloc_netdev_mqs(ops->priv_size, ifname, ops->setup,
                               num_tx_queues, num_rx_queues);
        if (!dev)
                goto err;

        dev_net_set(dev, net);
        dev->rtnl_link_ops = ops;
        dev->rtnl_link_state = RTNL_LINK_INITIALIZING;

        if (tb[IFLA_MTU])
                dev->mtu = nla_get_u32(tb[IFLA_MTU]);
        if (tb[IFLA_ADDRESS])
                memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
                                nla_len(tb[IFLA_ADDRESS]));
        if (tb[IFLA_BROADCAST])
                memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
                                nla_len(tb[IFLA_BROADCAST]));
        if (tb[IFLA_TXQLEN])
                dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
        if (tb[IFLA_OPERSTATE])
                set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
        if (tb[IFLA_LINKMODE])
                dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
        if (tb[IFLA_GROUP])
                dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));

        return dev;

err:
        return ERR_PTR(err);
}
EXPORT_SYMBOL(rtnl_create_link);

static int rtnl_group_changelink(struct net *net, int group,
                struct ifinfomsg *ifm,
                struct nlattr **tb)
{
        struct net_device *dev;
        int err;

        for_each_netdev(net, dev) {
                if (dev->group == group) {
                        err = do_setlink(dev, ifm, tb, NULL, 0);
                        if (err < 0)
                                return err;
                }
        }

        return 0;
}

static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
        struct net *net = sock_net(skb->sk);
        const struct rtnl_link_ops *ops;
        struct net_device *dev;
        struct ifinfomsg *ifm;
        char kind[MODULE_NAME_LEN];
        char ifname[IFNAMSIZ];
        struct nlattr *tb[IFLA_MAX+1];
        struct nlattr *linkinfo[IFLA_INFO_MAX+1];
        int err;

#ifdef CONFIG_MODULES
replay:
#endif
        err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
        if (err < 0)
                return err;

        if (tb[IFLA_IFNAME])
                nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
        else
                ifname[0] = '\0';

        ifm = nlmsg_data(nlh);
        if (ifm->ifi_index > 0)
                dev = __dev_get_by_index(net, ifm->ifi_index);
        else {
                if (ifname[0])
                        dev = __dev_get_by_name(net, ifname);
                else
                        dev = NULL;
        }

        err = validate_linkmsg(dev, tb);
        if (err < 0)
                return err;

        if (tb[IFLA_LINKINFO]) {
                err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
                                       tb[IFLA_LINKINFO], ifla_info_policy);
                if (err < 0)
                        return err;
        } else
                memset(linkinfo, 0, sizeof(linkinfo));

        if (linkinfo[IFLA_INFO_KIND]) {
                nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
                ops = rtnl_link_ops_get(kind);
        } else {
                kind[0] = '\0';
                ops = NULL;
        }

        if (1) {
                struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
                struct net *dest_net;

                if (ops) {
                        if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
                                err = nla_parse_nested(attr, ops->maxtype,
                                                       linkinfo[IFLA_INFO_DATA],
                                                       ops->policy);
                                if (err < 0)
                                        return err;
                                data = attr;
                        }
                        if (ops->validate) {
                                err = ops->validate(tb, data);
                                if (err < 0)
                                        return err;
                        }
                }

                if (dev) {
                        int modified = 0;

                        if (nlh->nlmsg_flags & NLM_F_EXCL)
                                return -EEXIST;
                        if (nlh->nlmsg_flags & NLM_F_REPLACE)
                                return -EOPNOTSUPP;

                        if (linkinfo[IFLA_INFO_DATA]) {
                                if (!ops || ops != dev->rtnl_link_ops ||
                                    !ops->changelink)
                                        return -EOPNOTSUPP;

                                err = ops->changelink(dev, tb, data);
                                if (err < 0)
                                        return err;
                                modified = 1;
                        }

                        return do_setlink(dev, ifm, tb, ifname, modified);
                }

                if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
                        if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
                                return rtnl_group_changelink(net,
                                                nla_get_u32(tb[IFLA_GROUP]),
                                                ifm, tb);
                        return -ENODEV;
                }

                if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
                        return -EOPNOTSUPP;

                if (!ops) {
#ifdef CONFIG_MODULES
                        if (kind[0]) {
                                __rtnl_unlock();
                                request_module("rtnl-link-%s", kind);
                                rtnl_lock();
                                ops = rtnl_link_ops_get(kind);
                                if (ops)
                                        goto replay;
                        }
#endif
                        return -EOPNOTSUPP;
                }

                if (!ifname[0])
                        snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);

                dest_net = rtnl_link_get_net(net, tb);
                if (IS_ERR(dest_net))
                        return PTR_ERR(dest_net);

                dev = rtnl_create_link(dest_net, ifname, ops, tb);
                if (IS_ERR(dev)) {
                        err = PTR_ERR(dev);
                        goto out;
                }

                dev->ifindex = ifm->ifi_index;

                if (ops->newlink)
                        err = ops->newlink(net, dev, tb, data);
                else
                        err = register_netdevice(dev);

                if (err < 0 && !IS_ERR(dev))
                        free_netdev(dev);
                if (err < 0)
                        goto out;

                err = rtnl_configure_link(dev, ifm);
                if (err < 0)
                        unregister_netdevice(dev);
out:
                put_net(dest_net);
                return err;
        }
}

static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
{
        struct net *net = sock_net(skb->sk);
        struct ifinfomsg *ifm;
        char ifname[IFNAMSIZ];
        struct nlattr *tb[IFLA_MAX+1];
        struct net_device *dev = NULL;
        struct sk_buff *nskb;
        int err;
        u32 ext_filter_mask = 0;

        err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
        if (err < 0)
                return err;

        if (tb[IFLA_IFNAME])
                nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);

        if (tb[IFLA_EXT_MASK])
                ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);

        ifm = nlmsg_data(nlh);
        if (ifm->ifi_index > 0)
                dev = __dev_get_by_index(net, ifm->ifi_index);
        else if (tb[IFLA_IFNAME])
                dev = __dev_get_by_name(net, ifname);
        else
                return -EINVAL;

        if (dev == NULL)
                return -ENODEV;

        nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
        if (nskb == NULL)
                return -ENOBUFS;

        err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid,
                               nlh->nlmsg_seq, 0, 0, ext_filter_mask);
        if (err < 0) {
                /* -EMSGSIZE implies BUG in if_nlmsg_size */
                WARN_ON(err == -EMSGSIZE);
                kfree_skb(nskb);
        } else
                err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);

        return err;
}

static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
{
        struct net *net = sock_net(skb->sk);
        struct net_device *dev;
        struct nlattr *tb[IFLA_MAX+1];
        u32 ext_filter_mask = 0;
        u16 min_ifinfo_dump_size = 0;

        if (nlmsg_parse(nlh, sizeof(struct rtgenmsg), tb, IFLA_MAX,
                        ifla_policy) >= 0) {
                if (tb[IFLA_EXT_MASK])
                        ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
        }

        if (!ext_filter_mask)
                return NLMSG_GOODSIZE;
        /*
         * traverse the list of net devices and compute the minimum
         * buffer size based upon the filter mask.
         */
        list_for_each_entry(dev, &net->dev_base_head, dev_list) {
                min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
                                             if_nlmsg_size(dev,
                                                           ext_filter_mask));
        }

        return min_ifinfo_dump_size;
}

static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
{
        int idx;
        int s_idx = cb->family;

        if (s_idx == 0)
                s_idx = 1;
        for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
                int type = cb->nlh->nlmsg_type-RTM_BASE;
                if (idx < s_idx || idx == PF_PACKET)
                        continue;
                if (rtnl_msg_handlers[idx] == NULL ||
                    rtnl_msg_handlers[idx][type].dumpit == NULL)
                        continue;
                if (idx > s_idx)
                        memset(&cb->args[0], 0, sizeof(cb->args));
                if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
                        break;
        }
        cb->family = idx;

        return skb->len;
}

void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change)
{
        struct net *net = dev_net(dev);
        struct sk_buff *skb;
        int err = -ENOBUFS;
        size_t if_info_size;

        skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), GFP_KERNEL);
        if (skb == NULL)
                goto errout;

        err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
        if (err < 0) {
                /* -EMSGSIZE implies BUG in if_nlmsg_size() */
                WARN_ON(err == -EMSGSIZE);
                kfree_skb(skb);
                goto errout;
        }
        rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
        return;
errout:
        if (err < 0)
                rtnl_set_sk_err(net, RTNLGRP_LINK, err);
}

static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
                                   struct net_device *dev,
                                   u8 *addr, u32 pid, u32 seq,
                                   int type, unsigned int flags)
{

        struct nlmsghdr *nlh;
        struct ndmsg *ndm;

        nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), NLM_F_MULTI);
        if (!nlh)
                return -EMSGSIZE;

        ndm = nlmsg_data(nlh);
        ndm->ndm_family  = AF_BRIDGE;
        ndm->ndm_pad1    = 0;
        ndm->ndm_pad2    = 0;
        ndm->ndm_flags   = flags;
        ndm->ndm_type    = 0;
        ndm->ndm_ifindex = dev->ifindex;
        ndm->ndm_state   = NUD_PERMANENT;

        if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
                goto nla_put_failure;

        return nlmsg_end(skb, nlh);

nla_put_failure:
        nlmsg_cancel(skb, nlh);
        return -EMSGSIZE;
}

static inline size_t rtnl_fdb_nlmsg_size(void)
{
        return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN);
}

static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, int type)
{
        struct net *net = dev_net(dev);
        struct sk_buff *skb;
        int err = -ENOBUFS;

        skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
        if (!skb)
                goto errout;

        err = nlmsg_populate_fdb_fill(skb, dev, addr, 0, 0, type, NTF_SELF);
        if (err < 0) {
                kfree_skb(skb);
                goto errout;
        }

        rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
        return;
errout:
        rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
}

static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
        struct net *net = sock_net(skb->sk);
        struct net_device *master = NULL;
        struct ndmsg *ndm;
        struct nlattr *tb[NDA_MAX+1];
        struct net_device *dev;
        u8 *addr;
        int err;

        if (!capable(CAP_NET_ADMIN))
                return -EPERM;

        err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
        if (err < 0)
                return err;

        ndm = nlmsg_data(nlh);
        if (ndm->ndm_ifindex == 0) {
                pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n");
                return -EINVAL;
        }

        dev = __dev_get_by_index(net, ndm->ndm_ifindex);
        if (dev == NULL) {
                pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n");
                return -ENODEV;
        }

        if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
                pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n");
                return -EINVAL;
        }

        addr = nla_data(tb[NDA_LLADDR]);
        if (!is_valid_ether_addr(addr)) {
                pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ether address\n");
                return -EINVAL;
        }

        err = -EOPNOTSUPP;

        /* Support fdb on master device the net/bridge default case */
        if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
            (dev->priv_flags & IFF_BRIDGE_PORT)) {
                master = dev->master;
                err = master->netdev_ops->ndo_fdb_add(ndm, tb,
                                                      dev, addr,
                                                      nlh->nlmsg_flags);
                if (err)
                        goto out;
                else
                        ndm->ndm_flags &= ~NTF_MASTER;
        }

        /* Embedded bridge, macvlan, and any other device support */
        if ((ndm->ndm_flags & NTF_SELF) && dev->netdev_ops->ndo_fdb_add) {
                err = dev->netdev_ops->ndo_fdb_add(ndm, tb,
                                                   dev, addr,
                                                   nlh->nlmsg_flags);

                if (!err) {
                        rtnl_fdb_notify(dev, addr, RTM_NEWNEIGH);
                        ndm->ndm_flags &= ~NTF_SELF;
                }
        }
out:
        return err;
}

static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
        struct net *net = sock_net(skb->sk);
        struct ndmsg *ndm;
        struct nlattr *llattr;
        struct net_device *dev;
        int err = -EINVAL;
        __u8 *addr;

        if (!capable(CAP_NET_ADMIN))
                return -EPERM;

        if (nlmsg_len(nlh) < sizeof(*ndm))
                return -EINVAL;

        ndm = nlmsg_data(nlh);
        if (ndm->ndm_ifindex == 0) {
                pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n");
                return -EINVAL;
        }

        dev = __dev_get_by_index(net, ndm->ndm_ifindex);
        if (dev == NULL) {
                pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n");
                return -ENODEV;
        }

        llattr = nlmsg_find_attr(nlh, sizeof(*ndm), NDA_LLADDR);
        if (llattr == NULL || nla_len(llattr) != ETH_ALEN) {
                pr_info("PF_BRIGDE: RTM_DELNEIGH with invalid address\n");
                return -EINVAL;
        }

        addr = nla_data(llattr);
        err = -EOPNOTSUPP;

        /* Support fdb on master device the net/bridge default case */
        if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
            (dev->priv_flags & IFF_BRIDGE_PORT)) {
                struct net_device *master = dev->master;

                if (master->netdev_ops->ndo_fdb_del)
                        err = master->netdev_ops->ndo_fdb_del(ndm, dev, addr);

                if (err)
                        goto out;
                else
                        ndm->ndm_flags &= ~NTF_MASTER;
        }

        /* Embedded bridge, macvlan, and any other device support */
        if ((ndm->ndm_flags & NTF_SELF) && dev->netdev_ops->ndo_fdb_del) {
                err = dev->netdev_ops->ndo_fdb_del(ndm, dev, addr);

                if (!err) {
                        rtnl_fdb_notify(dev, addr, RTM_DELNEIGH);
                        ndm->ndm_flags &= ~NTF_SELF;
                }
        }
out:
        return err;
}

static int nlmsg_populate_fdb(struct sk_buff *skb,
                              struct netlink_callback *cb,
                              struct net_device *dev,
                              int *idx,
                              struct netdev_hw_addr_list *list)
{
        struct netdev_hw_addr *ha;
        int err;
        u32 portid, seq;

        portid = NETLINK_CB(cb->skb).portid;
        seq = cb->nlh->nlmsg_seq;

        list_for_each_entry(ha, &list->list, list) {
                if (*idx < cb->args[0])
                        goto skip;

                err = nlmsg_populate_fdb_fill(skb, dev, ha->addr,
                                              portid, seq,
                                              RTM_NEWNEIGH, NTF_SELF);
                if (err < 0)
                        return err;
skip:
                *idx += 1;
        }
        return 0;
}

/**
 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
 * @nlh: netlink message header
 * @dev: netdevice
 *
 * Default netdevice operation to dump the existing unicast address list.
 * Returns zero on success.
 */
int ndo_dflt_fdb_dump(struct sk_buff *skb,
                      struct netlink_callback *cb,
                      struct net_device *dev,
                      int idx)
{
        int err;

        netif_addr_lock_bh(dev);
        err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc);
        if (err)
                goto out;
        nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc);
out:
        netif_addr_unlock_bh(dev);
        return idx;
}
EXPORT_SYMBOL(ndo_dflt_fdb_dump);

static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
        int idx = 0;
        struct net *net = sock_net(skb->sk);
        struct net_device *dev;

        rcu_read_lock();
        for_each_netdev_rcu(net, dev) {
                if (dev->priv_flags & IFF_BRIDGE_PORT) {
                        struct net_device *master = dev->master;
                        const struct net_device_ops *ops = master->netdev_ops;

                        if (ops->ndo_fdb_dump)
                                idx = ops->ndo_fdb_dump(skb, cb, dev, idx);
                }

                if (dev->netdev_ops->ndo_fdb_dump)
                        idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, idx);
        }
        rcu_read_unlock();

        cb->args[0] = idx;
        return skb->len;
}

int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
                            struct net_device *dev, u16 mode)
{
        struct nlmsghdr *nlh;
        struct ifinfomsg *ifm;
        struct nlattr *br_afspec;
        u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;

        nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), NLM_F_MULTI);
        if (nlh == NULL)
                return -EMSGSIZE;

        ifm = nlmsg_data(nlh);
        ifm->ifi_family = AF_BRIDGE;
        ifm->__ifi_pad = 0;
        ifm->ifi_type = dev->type;
        ifm->ifi_index = dev->ifindex;
        ifm->ifi_flags = dev_get_flags(dev);
        ifm->ifi_change = 0;


        if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
            nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
            nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
            (dev->master &&
             nla_put_u32(skb, IFLA_MASTER, dev->master->ifindex)) ||
            (dev->addr_len &&
             nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
            (dev->ifindex != dev->iflink &&
             nla_put_u32(skb, IFLA_LINK, dev->iflink)))
                goto nla_put_failure;

        br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
        if (!br_afspec)
                goto nla_put_failure;

        if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF) ||
            nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
                nla_nest_cancel(skb, br_afspec);
                goto nla_put_failure;
        }
        nla_nest_end(skb, br_afspec);

        return nlmsg_end(skb, nlh);
nla_put_failure:
        nlmsg_cancel(skb, nlh);
        return -EMSGSIZE;
}
EXPORT_SYMBOL(ndo_dflt_bridge_getlink);

static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
{
        struct net *net = sock_net(skb->sk);
        struct net_device *dev;
        int idx = 0;
        u32 portid = NETLINK_CB(cb->skb).portid;
        u32 seq = cb->nlh->nlmsg_seq;

        rcu_read_lock();
        for_each_netdev_rcu(net, dev) {
                const struct net_device_ops *ops = dev->netdev_ops;
                struct net_device *master = dev->master;

                if (master && master->netdev_ops->ndo_bridge_getlink) {
                        if (idx >= cb->args[0] &&
                            master->netdev_ops->ndo_bridge_getlink(
                                    skb, portid, seq, dev) < 0)
                                break;
                        idx++;
                }

                if (ops->ndo_bridge_getlink) {
                        if (idx >= cb->args[0] &&
                            ops->ndo_bridge_getlink(skb, portid, seq, dev) < 0)
                                break;
                        idx++;
                }
        }
        rcu_read_unlock();
        cb->args[0] = idx;

        return skb->len;
}

static inline size_t bridge_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(sizeof(u32))   /* IFLA_MASTER */
                + nla_total_size(sizeof(u32))   /* IFLA_MTU */
                + nla_total_size(sizeof(u32))   /* IFLA_LINK */
                + nla_total_size(sizeof(u32))   /* IFLA_OPERSTATE */
                + nla_total_size(sizeof(u8))    /* IFLA_PROTINFO */
                + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
                + nla_total_size(sizeof(u16))   /* IFLA_BRIDGE_FLAGS */
                + nla_total_size(sizeof(u16));  /* IFLA_BRIDGE_MODE */
}

static int rtnl_bridge_notify(struct net_device *dev, u16 flags)
{
        struct net *net = dev_net(dev);
        struct net_device *master = dev->master;
        struct sk_buff *skb;
        int err = -EOPNOTSUPP;

        skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
        if (!skb) {
                err = -ENOMEM;
                goto errout;
        }

        if ((!flags || (flags & BRIDGE_FLAGS_MASTER)) &&
            master && master->netdev_ops->ndo_bridge_getlink) {
                err = master->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev);
                if (err < 0)
                        goto errout;
        }

        if ((flags & BRIDGE_FLAGS_SELF) &&
            dev->netdev_ops->ndo_bridge_getlink) {
                err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev);
                if (err < 0)
                        goto errout;
        }

        rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
        return 0;
errout:
        WARN_ON(err == -EMSGSIZE);
        kfree_skb(skb);
        rtnl_set_sk_err(net, RTNLGRP_LINK, err);
        return err;
}

static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
                               void *arg)
{
        struct net *net = sock_net(skb->sk);
        struct ifinfomsg *ifm;
        struct net_device *dev;
        struct nlattr *br_spec, *attr = NULL;
        int rem, err = -EOPNOTSUPP;
        u16 oflags, flags = 0;
        bool have_flags = false;

        if (nlmsg_len(nlh) < sizeof(*ifm))
                return -EINVAL;

        ifm = nlmsg_data(nlh);
        if (ifm->ifi_family != AF_BRIDGE)
                return -EPFNOSUPPORT;

        dev = __dev_get_by_index(net, ifm->ifi_index);
        if (!dev) {
                pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
                return -ENODEV;
        }

        br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
        if (br_spec) {
                nla_for_each_nested(attr, br_spec, rem) {
                        if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
                                have_flags = true;
                                flags = nla_get_u16(attr);
                                break;
                        }
                }
        }

        oflags = flags;

        if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
                if (!dev->master ||
                    !dev->master->netdev_ops->ndo_bridge_setlink) {
                        err = -EOPNOTSUPP;
                        goto out;
                }

                err = dev->master->netdev_ops->ndo_bridge_setlink(dev, nlh);
                if (err)
                        goto out;

                flags &= ~BRIDGE_FLAGS_MASTER;
        }

        if ((flags & BRIDGE_FLAGS_SELF)) {
                if (!dev->netdev_ops->ndo_bridge_setlink)
                        err = -EOPNOTSUPP;
                else
                        err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh);

                if (!err)
                        flags &= ~BRIDGE_FLAGS_SELF;
        }

        if (have_flags)
                memcpy(nla_data(attr), &flags, sizeof(flags));
        /* Generate event to notify upper layer of bridge change */
        if (!err)
                err = rtnl_bridge_notify(dev, oflags);
out:
        return err;
}

/* Protected by RTNL sempahore.  */
static struct rtattr **rta_buf;
static int rtattr_max;

/* Process one rtnetlink message. */

static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
{
        struct net *net = sock_net(skb->sk);
        rtnl_doit_func doit;
        int sz_idx, kind;
        int min_len;
        int family;
        int type;
        int err;

        type = nlh->nlmsg_type;
        if (type > RTM_MAX)
                return -EOPNOTSUPP;

        type -= RTM_BASE;

        /* All the messages must have at least 1 byte length */
        if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
                return 0;

        family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family;
        sz_idx = type>>2;
        kind = type&3;

        if (kind != 2 && !ns_capable(net->user_ns, CAP_NET_ADMIN))
                return -EPERM;

        if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
                struct sock *rtnl;
                rtnl_dumpit_func dumpit;
                rtnl_calcit_func calcit;
                u16 min_dump_alloc = 0;

                dumpit = rtnl_get_dumpit(family, type);
                if (dumpit == NULL)
                        return -EOPNOTSUPP;
                calcit = rtnl_get_calcit(family, type);
                if (calcit)
                        min_dump_alloc = calcit(skb, nlh);

                __rtnl_unlock();
                rtnl = net->rtnl;
                {
                        struct netlink_dump_control c = {
                                .dump           = dumpit,
                                .min_dump_alloc = min_dump_alloc,
                        };
                        err = netlink_dump_start(rtnl, skb, nlh, &c);
                }
                rtnl_lock();
                return err;
        }

        memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));

        min_len = rtm_min[sz_idx];
        if (nlh->nlmsg_len < min_len)
                return -EINVAL;

        if (nlh->nlmsg_len > min_len) {
                int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
                struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len);

                while (RTA_OK(attr, attrlen)) {
                        unsigned int flavor = attr->rta_type;
                        if (flavor) {
                                if (flavor > rta_max[sz_idx])
                                        return -EINVAL;
                                rta_buf[flavor-1] = attr;
                        }
                        attr = RTA_NEXT(attr, attrlen);
                }
        }

        doit = rtnl_get_doit(family, type);
        if (doit == NULL)
                return -EOPNOTSUPP;

        return doit(skb, nlh, (void *)&rta_buf[0]);
}

static void rtnetlink_rcv(struct sk_buff *skb)
{
        rtnl_lock();
        netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
        rtnl_unlock();
}

static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
{
        struct net_device *dev = ptr;

        switch (event) {
        case NETDEV_UP:
        case NETDEV_DOWN:
        case NETDEV_PRE_UP:
        case NETDEV_POST_INIT:
        case NETDEV_REGISTER:
        case NETDEV_CHANGE:
        case NETDEV_PRE_TYPE_CHANGE:
        case NETDEV_GOING_DOWN:
        case NETDEV_UNREGISTER:
        case NETDEV_UNREGISTER_FINAL:
        case NETDEV_RELEASE:
        case NETDEV_JOIN:
                break;
        default:
                rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
                break;
        }
        return NOTIFY_DONE;
}

static struct notifier_block rtnetlink_dev_notifier = {
        .notifier_call  = rtnetlink_event,
};


static int __net_init rtnetlink_net_init(struct net *net)
{
        struct sock *sk;
        struct netlink_kernel_cfg cfg = {
                .groups         = RTNLGRP_MAX,
                .input          = rtnetlink_rcv,
                .cb_mutex       = &rtnl_mutex,
                .flags          = NL_CFG_F_NONROOT_RECV,
        };

        sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
        if (!sk)
                return -ENOMEM;
        net->rtnl = sk;
        return 0;
}

static void __net_exit rtnetlink_net_exit(struct net *net)
{
        netlink_kernel_release(net->rtnl);
        net->rtnl = NULL;
}

static struct pernet_operations rtnetlink_net_ops = {
        .init = rtnetlink_net_init,
        .exit = rtnetlink_net_exit,
};

void __init rtnetlink_init(void)
{
        int i;

        rtattr_max = 0;
        for (i = 0; i < ARRAY_SIZE(rta_max); i++)
                if (rta_max[i] > rtattr_max)
                        rtattr_max = rta_max[i];
        rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
        if (!rta_buf)
                panic("rtnetlink_init: cannot allocate rta_buf\n");

        if (register_pernet_subsys(&rtnetlink_net_ops))
                panic("rtnetlink_init: cannot initialize rtnetlink\n");

        register_netdevice_notifier(&rtnetlink_dev_notifier);

        rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
                      rtnl_dump_ifinfo, rtnl_calcit);
        rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
        rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
        rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);

        rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
        rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);

        rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL);
        rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL);
        rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL);

        rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL);
        rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL);
}