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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
/* NetworkManager -- Network link manager
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Copyright (C) 2007 - 2008 Red Hat, Inc.
*/
#include "config.h"
#include "nm-netlink.h"
#include "nm-utils.h"
#include <glib.h>
#include <signal.h>
#include <pthread.h>
#include <unistd.h>
#include <netlink/object-api.h>
static struct nl_cache * link_cache = NULL;
static struct nl_handle * def_nl_handle = NULL;
static struct nl_cache *
get_link_cache (void)
{
struct nl_handle * nlh;
nlh = nm_netlink_get_default_handle ();
if (G_UNLIKELY (!nlh)) {
nm_warning ("couldn't allocate netlink handle.");
return NULL;
}
if (G_UNLIKELY (!link_cache))
link_cache = rtnl_link_alloc_cache (nlh);
if (G_UNLIKELY (!link_cache)) {
nm_warning ("couldn't allocate netlink link cache: %s", nl_geterror ());
return NULL;
}
nl_cache_update (nlh, link_cache);
return link_cache;
}
struct nl_handle *
nm_netlink_get_default_handle (void)
{
struct nl_cb *cb;
#ifdef LIBNL_NEEDS_ADDR_CACHING_WORKAROUND
struct nl_cache *addr_cache;
#endif
if (def_nl_handle)
return def_nl_handle;
cb = nl_cb_alloc(NL_CB_VERBOSE);
def_nl_handle = nl_handle_alloc_cb (cb);
if (!def_nl_handle) {
nm_warning ("couldn't allocate netlink handle.");
return NULL;
}
if (nl_connect (def_nl_handle, NETLINK_ROUTE) < 0) {
nm_error ("couldn't connect to netlink: %s", nl_geterror ());
return NULL;
}
#ifdef LIBNL_NEEDS_ADDR_CACHING_WORKAROUND
/* Work around apparent libnl bug; rtnl_addr requires that all
* addresses have the "peer" attribute set in order to be compared
* for equality, but this attribute is not normally set. As a
* result, most addresses will not compare as equal even to
* themselves, busting caching.
*/
addr_cache = rtnl_addr_alloc_cache (def_nl_handle);
nl_cache_get_ops (addr_cache)->co_obj_ops->oo_id_attrs &= ~0x80;
nl_cache_free (addr_cache);
#endif
return def_nl_handle;
}
int
nm_netlink_iface_to_index (const char *iface)
{
struct nl_cache * cache;
g_return_val_if_fail (iface != NULL, -1);
cache = get_link_cache ();
if (!cache)
return RTNL_LINK_NOT_FOUND;
return rtnl_link_name2i (cache, iface);
}
#define MAX_IFACE_LEN 33
char *
nm_netlink_index_to_iface (int idx)
{
struct nl_cache * cache;
char * buf = NULL;
cache = get_link_cache ();
if (!cache)
return NULL;
buf = g_malloc0 (MAX_IFACE_LEN);
if (buf == NULL) {
nm_warning ("Not enough memory to allocate interface name buffer.");
return NULL;
}
if (rtnl_link_i2name (cache, idx, buf, MAX_IFACE_LEN - 1) == NULL) {
g_free (buf);
buf = NULL;
}
return buf;
}
struct rtnl_link *
nm_netlink_index_to_rtnl_link (int idx)
{
struct nl_cache *cache;
cache = get_link_cache ();
if (!cache)
return NULL;
return rtnl_link_get (cache, idx);
}
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