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net/ncsi: Add generic netlink family 

Add a generic netlink family for NCSI. This supports three commands;
NCSI_CMD_PKG_INFO which returns information on packages and their
associated channels, NCSI_CMD_SET_INTERFACE which allows a specific
package or package/channel combination to be set as the preferred
choice, and NCSI_CMD_CLEAR_INTERFACE which clears any preferred setting.

Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Samuel Mendoza-Jonas 2018-03-05 11:39:05 +11:00 committed by David S. Miller
parent be63189294
commit 955dc68cb9
6 changed files with 586 additions and 5 deletions
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115
include/uapi/linux/ncsi.h Normal file
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@ -0,0 +1,115 @@
/*
* Copyright Samuel Mendoza-Jonas, IBM Corporation 2018.
*
* 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.
*/
#ifndef __UAPI_NCSI_NETLINK_H__
#define __UAPI_NCSI_NETLINK_H__
/**
* enum ncsi_nl_commands - supported NCSI commands
*
* @NCSI_CMD_UNSPEC: unspecified command to catch errors
* @NCSI_CMD_PKG_INFO: list package and channel attributes. Requires
* NCSI_ATTR_IFINDEX. If NCSI_ATTR_PACKAGE_ID is specified returns the
* specific package and its channels - otherwise a dump request returns
* all packages and their associated channels.
* @NCSI_CMD_SET_INTERFACE: set preferred package and channel combination.
* Requires NCSI_ATTR_IFINDEX and the preferred NCSI_ATTR_PACKAGE_ID and
* optionally the preferred NCSI_ATTR_CHANNEL_ID.
* @NCSI_CMD_CLEAR_INTERFACE: clear any preferred package/channel combination.
* Requires NCSI_ATTR_IFINDEX.
* @NCSI_CMD_MAX: highest command number
*/
enum ncsi_nl_commands {
NCSI_CMD_UNSPEC,
NCSI_CMD_PKG_INFO,
NCSI_CMD_SET_INTERFACE,
NCSI_CMD_CLEAR_INTERFACE,
__NCSI_CMD_AFTER_LAST,
NCSI_CMD_MAX = __NCSI_CMD_AFTER_LAST - 1
};
/**
* enum ncsi_nl_attrs - General NCSI netlink attributes
*
* @NCSI_ATTR_UNSPEC: unspecified attributes to catch errors
* @NCSI_ATTR_IFINDEX: ifindex of network device using NCSI
* @NCSI_ATTR_PACKAGE_LIST: nested array of NCSI_PKG_ATTR attributes
* @NCSI_ATTR_PACKAGE_ID: package ID
* @NCSI_ATTR_CHANNEL_ID: channel ID
* @NCSI_ATTR_MAX: highest attribute number
*/
enum ncsi_nl_attrs {
NCSI_ATTR_UNSPEC,
NCSI_ATTR_IFINDEX,
NCSI_ATTR_PACKAGE_LIST,
NCSI_ATTR_PACKAGE_ID,
NCSI_ATTR_CHANNEL_ID,
__NCSI_ATTR_AFTER_LAST,
NCSI_ATTR_MAX = __NCSI_ATTR_AFTER_LAST - 1
};
/**
* enum ncsi_nl_pkg_attrs - NCSI netlink package-specific attributes
*
* @NCSI_PKG_ATTR_UNSPEC: unspecified attributes to catch errors
* @NCSI_PKG_ATTR: nested array of package attributes
* @NCSI_PKG_ATTR_ID: package ID
* @NCSI_PKG_ATTR_FORCED: flag signifying a package has been set as preferred
* @NCSI_PKG_ATTR_CHANNEL_LIST: nested array of NCSI_CHANNEL_ATTR attributes
* @NCSI_PKG_ATTR_MAX: highest attribute number
*/
enum ncsi_nl_pkg_attrs {
NCSI_PKG_ATTR_UNSPEC,
NCSI_PKG_ATTR,
NCSI_PKG_ATTR_ID,
NCSI_PKG_ATTR_FORCED,
NCSI_PKG_ATTR_CHANNEL_LIST,
__NCSI_PKG_ATTR_AFTER_LAST,
NCSI_PKG_ATTR_MAX = __NCSI_PKG_ATTR_AFTER_LAST - 1
};
/**
* enum ncsi_nl_channel_attrs - NCSI netlink channel-specific attributes
*
* @NCSI_CHANNEL_ATTR_UNSPEC: unspecified attributes to catch errors
* @NCSI_CHANNEL_ATTR: nested array of channel attributes
* @NCSI_CHANNEL_ATTR_ID: channel ID
* @NCSI_CHANNEL_ATTR_VERSION_MAJOR: channel major version number
* @NCSI_CHANNEL_ATTR_VERSION_MINOR: channel minor version number
* @NCSI_CHANNEL_ATTR_VERSION_STR: channel version string
* @NCSI_CHANNEL_ATTR_LINK_STATE: channel link state flags
* @NCSI_CHANNEL_ATTR_ACTIVE: channels with this flag are in
* NCSI_CHANNEL_ACTIVE state
* @NCSI_CHANNEL_ATTR_FORCED: flag signifying a channel has been set as
* preferred
* @NCSI_CHANNEL_ATTR_VLAN_LIST: nested array of NCSI_CHANNEL_ATTR_VLAN_IDs
* @NCSI_CHANNEL_ATTR_VLAN_ID: VLAN ID being filtered on this channel
* @NCSI_CHANNEL_ATTR_MAX: highest attribute number
*/
enum ncsi_nl_channel_attrs {
NCSI_CHANNEL_ATTR_UNSPEC,
NCSI_CHANNEL_ATTR,
NCSI_CHANNEL_ATTR_ID,
NCSI_CHANNEL_ATTR_VERSION_MAJOR,
NCSI_CHANNEL_ATTR_VERSION_MINOR,
NCSI_CHANNEL_ATTR_VERSION_STR,
NCSI_CHANNEL_ATTR_LINK_STATE,
NCSI_CHANNEL_ATTR_ACTIVE,
NCSI_CHANNEL_ATTR_FORCED,
NCSI_CHANNEL_ATTR_VLAN_LIST,
NCSI_CHANNEL_ATTR_VLAN_ID,
__NCSI_CHANNEL_ATTR_AFTER_LAST,
NCSI_CHANNEL_ATTR_MAX = __NCSI_CHANNEL_ATTR_AFTER_LAST - 1
};
#endif /* __UAPI_NCSI_NETLINK_H__ */

2
net/ncsi/Makefile
View File

@ -1,4 +1,4 @@
#
# Makefile for NCSI API
#
obj-$(CONFIG_NET_NCSI) += ncsi-cmd.o ncsi-rsp.o ncsi-aen.o ncsi-manage.o
obj-$(CONFIG_NET_NCSI) += ncsi-cmd.o ncsi-rsp.o ncsi-aen.o ncsi-manage.o ncsi-netlink.o

3
net/ncsi/internal.h
View File

@ -276,6 +276,8 @@ struct ncsi_dev_priv {
unsigned int package_num; /* Number of packages */
struct list_head packages; /* List of packages */
struct ncsi_channel *hot_channel; /* Channel was ever active */
struct ncsi_package *force_package; /* Force a specific package */
struct ncsi_channel *force_channel; /* Force a specific channel */
struct ncsi_request requests[256]; /* Request table */
unsigned int request_id; /* Last used request ID */
#define NCSI_REQ_START_IDX 1
@ -318,6 +320,7 @@ extern spinlock_t ncsi_dev_lock;
list_for_each_entry_rcu(nc, &np->channels, node)
/* Resources */
u32 *ncsi_get_filter(struct ncsi_channel *nc, int table, int index);
int ncsi_find_filter(struct ncsi_channel *nc, int table, void *data);
int ncsi_add_filter(struct ncsi_channel *nc, int table, void *data);
int ncsi_remove_filter(struct ncsi_channel *nc, int table, int index);

30
net/ncsi/ncsi-manage.c
View File

@ -12,7 +12,6 @@
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/netlink.h>
#include <net/ncsi.h>
#include <net/net_namespace.h>
@ -23,6 +22,7 @@
#include "internal.h"
#include "ncsi-pkt.h"
#include "ncsi-netlink.h"
LIST_HEAD(ncsi_dev_list);
DEFINE_SPINLOCK(ncsi_dev_lock);
@ -38,7 +38,7 @@ static inline int ncsi_filter_size(int table)
return sizes[table];
}
static u32 *ncsi_get_filter(struct ncsi_channel *nc, int table, int index)
u32 *ncsi_get_filter(struct ncsi_channel *nc, int table, int index)
{
struct ncsi_channel_filter *ncf;
int size;
@ -965,20 +965,37 @@ error:
static int ncsi_choose_active_channel(struct ncsi_dev_priv *ndp)
{
struct ncsi_package *np;
struct ncsi_channel *nc, *found, *hot_nc;
struct ncsi_package *np, *force_package;
struct ncsi_channel *nc, *found, *hot_nc, *force_channel;
struct ncsi_channel_mode *ncm;
unsigned long flags;
spin_lock_irqsave(&ndp->lock, flags);
hot_nc = ndp->hot_channel;
force_channel = ndp->force_channel;
force_package = ndp->force_package;
spin_unlock_irqrestore(&ndp->lock, flags);
/* Force a specific channel whether or not it has link if we have been
* configured to do so
*/
if (force_package && force_channel) {
found = force_channel;
ncm = &found->modes[NCSI_MODE_LINK];
if (!(ncm->data[2] & 0x1))
netdev_info(ndp->ndev.dev,
"NCSI: Channel %u forced, but it is link down\n",
found->id);
goto out;
}
/* The search is done once an inactive channel with up
* link is found.
*/
found = NULL;
NCSI_FOR_EACH_PACKAGE(ndp, np) {
if (ndp->force_package && np != ndp->force_package)
continue;
NCSI_FOR_EACH_CHANNEL(np, nc) {
spin_lock_irqsave(&nc->lock, flags);
@ -1594,6 +1611,9 @@ struct ncsi_dev *ncsi_register_dev(struct net_device *dev,
ndp->ptype.dev = dev;
dev_add_pack(&ndp->ptype);
/* Set up generic netlink interface */
ncsi_init_netlink(dev);
return nd;
}
EXPORT_SYMBOL_GPL(ncsi_register_dev);
@ -1673,6 +1693,8 @@ void ncsi_unregister_dev(struct ncsi_dev *nd)
#endif
spin_unlock_irqrestore(&ncsi_dev_lock, flags);
ncsi_unregister_netlink(nd->dev);
kfree(ndp);
}
EXPORT_SYMBOL_GPL(ncsi_unregister_dev);

421
net/ncsi/ncsi-netlink.c Normal file
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@ -0,0 +1,421 @@
/*
* Copyright Samuel Mendoza-Jonas, IBM Corporation 2018.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/if_arp.h>
#include <linux/rtnetlink.h>
#include <linux/etherdevice.h>
#include <linux/module.h>
#include <net/genetlink.h>
#include <net/ncsi.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <uapi/linux/ncsi.h>
#include "internal.h"
#include "ncsi-netlink.h"
static struct genl_family ncsi_genl_family;
static const struct nla_policy ncsi_genl_policy[NCSI_ATTR_MAX + 1] = {
[NCSI_ATTR_IFINDEX] = { .type = NLA_U32 },
[NCSI_ATTR_PACKAGE_LIST] = { .type = NLA_NESTED },
[NCSI_ATTR_PACKAGE_ID] = { .type = NLA_U32 },
[NCSI_ATTR_CHANNEL_ID] = { .type = NLA_U32 },
};
static struct ncsi_dev_priv *ndp_from_ifindex(struct net *net, u32 ifindex)
{
struct ncsi_dev_priv *ndp;
struct net_device *dev;
struct ncsi_dev *nd;
struct ncsi_dev;
if (!net)
return NULL;
dev = dev_get_by_index(net, ifindex);
if (!dev) {
pr_err("NCSI netlink: No device for ifindex %u\n", ifindex);
return NULL;
}
nd = ncsi_find_dev(dev);
ndp = nd ? TO_NCSI_DEV_PRIV(nd) : NULL;
dev_put(dev);
return ndp;
}
static int ncsi_write_channel_info(struct sk_buff *skb,
struct ncsi_dev_priv *ndp,
struct ncsi_channel *nc)
{
struct nlattr *vid_nest;
struct ncsi_channel_filter *ncf;
struct ncsi_channel_mode *m;
u32 *data;
int i;
nla_put_u32(skb, NCSI_CHANNEL_ATTR_ID, nc->id);
m = &nc->modes[NCSI_MODE_LINK];
nla_put_u32(skb, NCSI_CHANNEL_ATTR_LINK_STATE, m->data[2]);
if (nc->state == NCSI_CHANNEL_ACTIVE)
nla_put_flag(skb, NCSI_CHANNEL_ATTR_ACTIVE);
if (ndp->force_channel == nc)
nla_put_flag(skb, NCSI_CHANNEL_ATTR_FORCED);
nla_put_u32(skb, NCSI_CHANNEL_ATTR_VERSION_MAJOR, nc->version.version);
nla_put_u32(skb, NCSI_CHANNEL_ATTR_VERSION_MINOR, nc->version.alpha2);
nla_put_string(skb, NCSI_CHANNEL_ATTR_VERSION_STR, nc->version.fw_name);
vid_nest = nla_nest_start(skb, NCSI_CHANNEL_ATTR_VLAN_LIST);
if (!vid_nest)
return -ENOMEM;
ncf = nc->filters[NCSI_FILTER_VLAN];
i = -1;
if (ncf) {
while ((i = find_next_bit((void *)&ncf->bitmap, ncf->total,
i + 1)) < ncf->total) {
data = ncsi_get_filter(nc, NCSI_FILTER_VLAN, i);
/* Uninitialised channels will have 'zero' vlan ids */
if (!data || !*data)
continue;
nla_put_u16(skb, NCSI_CHANNEL_ATTR_VLAN_ID,
*(u16 *)data);
}
}
nla_nest_end(skb, vid_nest);
return 0;
}
static int ncsi_write_package_info(struct sk_buff *skb,
struct ncsi_dev_priv *ndp, unsigned int id)
{
struct nlattr *pnest, *cnest, *nest;
struct ncsi_package *np;
struct ncsi_channel *nc;
bool found;
int rc;
if (id > ndp->package_num) {
netdev_info(ndp->ndev.dev, "NCSI: No package with id %u\n", id);
return -ENODEV;
}
found = false;
NCSI_FOR_EACH_PACKAGE(ndp, np) {
if (np->id != id)
continue;
pnest = nla_nest_start(skb, NCSI_PKG_ATTR);
if (!pnest)
return -ENOMEM;
nla_put_u32(skb, NCSI_PKG_ATTR_ID, np->id);
if (ndp->force_package == np)
nla_put_flag(skb, NCSI_PKG_ATTR_FORCED);
cnest = nla_nest_start(skb, NCSI_PKG_ATTR_CHANNEL_LIST);
if (!cnest) {
nla_nest_cancel(skb, pnest);
return -ENOMEM;
}
NCSI_FOR_EACH_CHANNEL(np, nc) {
nest = nla_nest_start(skb, NCSI_CHANNEL_ATTR);
if (!nest) {
nla_nest_cancel(skb, cnest);
nla_nest_cancel(skb, pnest);
return -ENOMEM;
}
rc = ncsi_write_channel_info(skb, ndp, nc);
if (rc) {
nla_nest_cancel(skb, nest);
nla_nest_cancel(skb, cnest);
nla_nest_cancel(skb, pnest);
return rc;
}
nla_nest_end(skb, nest);
}
nla_nest_end(skb, cnest);
nla_nest_end(skb, pnest);
found = true;
}
if (!found)
return -ENODEV;
return 0;
}
static int ncsi_pkg_info_nl(struct sk_buff *msg, struct genl_info *info)
{
struct ncsi_dev_priv *ndp;
unsigned int package_id;
struct sk_buff *skb;
struct nlattr *attr;
void *hdr;
int rc;
if (!info || !info->attrs)
return -EINVAL;
if (!info->attrs[NCSI_ATTR_IFINDEX])
return -EINVAL;
if (!info->attrs[NCSI_ATTR_PACKAGE_ID])
return -EINVAL;
ndp = ndp_from_ifindex(genl_info_net(info),
nla_get_u32(info->attrs[NCSI_ATTR_IFINDEX]));
if (!ndp)
return -ENODEV;
skb = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!skb)
return -ENOMEM;
hdr = genlmsg_put(skb, info->snd_portid, info->snd_seq,
&ncsi_genl_family, 0, NCSI_CMD_PKG_INFO);
if (!hdr) {
kfree(skb);
return -EMSGSIZE;
}
package_id = nla_get_u32(info->attrs[NCSI_ATTR_PACKAGE_ID]);
attr = nla_nest_start(skb, NCSI_ATTR_PACKAGE_LIST);
rc = ncsi_write_package_info(skb, ndp, package_id);
if (rc) {
nla_nest_cancel(skb, attr);
goto err;
}
nla_nest_end(skb, attr);
genlmsg_end(skb, hdr);
return genlmsg_reply(skb, info);
err:
genlmsg_cancel(skb, hdr);
kfree(skb);
return rc;
}
static int ncsi_pkg_info_all_nl(struct sk_buff *skb,
struct netlink_callback *cb)
{
struct nlattr *attrs[NCSI_ATTR_MAX];
struct ncsi_package *np, *package;
struct ncsi_dev_priv *ndp;
unsigned int package_id;
struct nlattr *attr;
void *hdr;
int rc;
rc = genlmsg_parse(cb->nlh, &ncsi_genl_family, attrs, NCSI_ATTR_MAX,
ncsi_genl_policy, NULL);
if (rc)
return rc;
if (!attrs[NCSI_ATTR_IFINDEX])
return -EINVAL;
ndp = ndp_from_ifindex(get_net(sock_net(skb->sk)),
nla_get_u32(attrs[NCSI_ATTR_IFINDEX]));
if (!ndp)
return -ENODEV;
package_id = cb->args[0];
package = NULL;
NCSI_FOR_EACH_PACKAGE(ndp, np)
if (np->id == package_id)
package = np;
if (!package)
return 0; /* done */
hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
&ncsi_genl_family, 0, NCSI_CMD_PKG_INFO);
if (!hdr) {
rc = -EMSGSIZE;
goto err;
}
attr = nla_nest_start(skb, NCSI_ATTR_PACKAGE_LIST);
rc = ncsi_write_package_info(skb, ndp, package->id);
if (rc) {
nla_nest_cancel(skb, attr);
goto err;
}
nla_nest_end(skb, attr);
genlmsg_end(skb, hdr);
cb->args[0] = package_id + 1;
return skb->len;
err:
genlmsg_cancel(skb, hdr);
return rc;
}
static int ncsi_set_interface_nl(struct sk_buff *msg, struct genl_info *info)
{
struct ncsi_package *np, *package;
struct ncsi_channel *nc, *channel;
u32 package_id, channel_id;
struct ncsi_dev_priv *ndp;
unsigned long flags;
if (!info || !info->attrs)
return -EINVAL;
if (!info->attrs[NCSI_ATTR_IFINDEX])
return -EINVAL;
if (!info->attrs[NCSI_ATTR_PACKAGE_ID])
return -EINVAL;
ndp = ndp_from_ifindex(get_net(sock_net(msg->sk)),
nla_get_u32(info->attrs[NCSI_ATTR_IFINDEX]));
if (!ndp)
return -ENODEV;
package_id = nla_get_u32(info->attrs[NCSI_ATTR_PACKAGE_ID]);
package = NULL;
spin_lock_irqsave(&ndp->lock, flags);
NCSI_FOR_EACH_PACKAGE(ndp, np)
if (np->id == package_id)
package = np;
if (!package) {
/* The user has set a package that does not exist */
return -ERANGE;
}
channel = NULL;
if (!info->attrs[NCSI_ATTR_CHANNEL_ID]) {
/* Allow any channel */
channel_id = NCSI_RESERVED_CHANNEL;
} else {
channel_id = nla_get_u32(info->attrs[NCSI_ATTR_CHANNEL_ID]);
NCSI_FOR_EACH_CHANNEL(package, nc)
if (nc->id == channel_id)
channel = nc;
}
if (channel_id != NCSI_RESERVED_CHANNEL && !channel) {
/* The user has set a channel that does not exist on this
* package
*/
netdev_info(ndp->ndev.dev, "NCSI: Channel %u does not exist!\n",
channel_id);
return -ERANGE;
}
ndp->force_package = package;
ndp->force_channel = channel;
spin_unlock_irqrestore(&ndp->lock, flags);
netdev_info(ndp->ndev.dev, "Set package 0x%x, channel 0x%x%s as preferred\n",
package_id, channel_id,
channel_id == NCSI_RESERVED_CHANNEL ? " (any)" : "");
/* Bounce the NCSI channel to set changes */
ncsi_stop_dev(&ndp->ndev);
ncsi_start_dev(&ndp->ndev);
return 0;
}
static int ncsi_clear_interface_nl(struct sk_buff *msg, struct genl_info *info)
{
struct ncsi_dev_priv *ndp;
unsigned long flags;
if (!info || !info->attrs)
return -EINVAL;
if (!info->attrs[NCSI_ATTR_IFINDEX])
return -EINVAL;
ndp = ndp_from_ifindex(get_net(sock_net(msg->sk)),
nla_get_u32(info->attrs[NCSI_ATTR_IFINDEX]));
if (!ndp)
return -ENODEV;
/* Clear any override */
spin_lock_irqsave(&ndp->lock, flags);
ndp->force_package = NULL;
ndp->force_channel = NULL;
spin_unlock_irqrestore(&ndp->lock, flags);
netdev_info(ndp->ndev.dev, "NCSI: Cleared preferred package/channel\n");
/* Bounce the NCSI channel to set changes */
ncsi_stop_dev(&ndp->ndev);
ncsi_start_dev(&ndp->ndev);
return 0;
}
static const struct genl_ops ncsi_ops[] = {
{
.cmd = NCSI_CMD_PKG_INFO,
.policy = ncsi_genl_policy,
.doit = ncsi_pkg_info_nl,
.dumpit = ncsi_pkg_info_all_nl,
.flags = 0,
},
{
.cmd = NCSI_CMD_SET_INTERFACE,
.policy = ncsi_genl_policy,
.doit = ncsi_set_interface_nl,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = NCSI_CMD_CLEAR_INTERFACE,
.policy = ncsi_genl_policy,
.doit = ncsi_clear_interface_nl,
.flags = GENL_ADMIN_PERM,
},
};
static struct genl_family ncsi_genl_family __ro_after_init = {
.name = "NCSI",
.version = 0,
.maxattr = NCSI_ATTR_MAX,
.module = THIS_MODULE,
.ops = ncsi_ops,
.n_ops = ARRAY_SIZE(ncsi_ops),
};
int ncsi_init_netlink(struct net_device *dev)
{
int rc;
rc = genl_register_family(&ncsi_genl_family);
if (rc)
netdev_err(dev, "ncsi: failed to register netlink family\n");
return rc;
}
int ncsi_unregister_netlink(struct net_device *dev)
{
int rc;
rc = genl_unregister_family(&ncsi_genl_family);
if (rc)
netdev_err(dev, "ncsi: failed to unregister netlink family\n");
return rc;
}

20
net/ncsi/ncsi-netlink.h Normal file
View File

@ -0,0 +1,20 @@
/*
* Copyright Samuel Mendoza-Jonas, IBM Corporation 2018.
*
* 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.
*/
#ifndef __NCSI_NETLINK_H__
#define __NCSI_NETLINK_H__
#include <linux/netdevice.h>
#include "internal.h"
int ncsi_init_netlink(struct net_device *dev);
int ncsi_unregister_netlink(struct net_device *dev);
#endif /* __NCSI_NETLINK_H__ */