mirror of
https://gitlab.freedesktop.org/NetworkManager/NetworkManager.git
synced 2026-01-18 09:50:33 +01:00
149 lines
3.5 KiB
C
149 lines
3.5 KiB
C
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
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/* NetworkManager -- Network link manager
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Copyright (C) 2007 - 2008 Red Hat, Inc.
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*/
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#include "config.h"
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#include "nm-netlink.h"
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#include "nm-logging.h"
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#include <glib.h>
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#include <signal.h>
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#include <pthread.h>
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#include <unistd.h>
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#include <netlink/object-api.h>
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static struct nl_cache * link_cache = NULL;
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static struct nl_handle * def_nl_handle = NULL;
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static struct nl_cache *
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get_link_cache (void)
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{
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struct nl_handle * nlh;
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nlh = nm_netlink_get_default_handle ();
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if (G_UNLIKELY (!nlh)) {
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nm_log_err (LOGD_HW, "couldn't allocate netlink handle.");
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return NULL;
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}
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if (G_UNLIKELY (!link_cache))
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link_cache = rtnl_link_alloc_cache (nlh);
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if (G_UNLIKELY (!link_cache)) {
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nm_log_err (LOGD_HW, "couldn't allocate netlink link cache: %s", nl_geterror ());
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return NULL;
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}
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nl_cache_update (nlh, link_cache);
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return link_cache;
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}
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struct nl_handle *
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nm_netlink_get_default_handle (void)
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{
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struct nl_cb *cb;
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#ifdef LIBNL_NEEDS_ADDR_CACHING_WORKAROUND
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struct nl_cache *addr_cache;
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#endif
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if (def_nl_handle)
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return def_nl_handle;
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cb = nl_cb_alloc(NL_CB_VERBOSE);
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def_nl_handle = nl_handle_alloc_cb (cb);
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if (!def_nl_handle) {
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nm_log_err (LOGD_HW, "couldn't allocate netlink handle.");
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return NULL;
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}
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if (nl_connect (def_nl_handle, NETLINK_ROUTE) < 0) {
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nm_log_err (LOGD_HW, "couldn't connect to netlink: %s", nl_geterror ());
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return NULL;
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}
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#ifdef LIBNL_NEEDS_ADDR_CACHING_WORKAROUND
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/* Work around apparent libnl bug; rtnl_addr requires that all
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* addresses have the "peer" attribute set in order to be compared
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* for equality, but this attribute is not normally set. As a
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* result, most addresses will not compare as equal even to
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* themselves, busting caching.
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*/
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addr_cache = rtnl_addr_alloc_cache (def_nl_handle);
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nl_cache_get_ops (addr_cache)->co_obj_ops->oo_id_attrs &= ~0x80;
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nl_cache_free (addr_cache);
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#endif
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return def_nl_handle;
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}
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int
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nm_netlink_iface_to_index (const char *iface)
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{
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struct nl_cache * cache;
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g_return_val_if_fail (iface != NULL, -1);
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cache = get_link_cache ();
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if (!cache)
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return RTNL_LINK_NOT_FOUND;
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return rtnl_link_name2i (cache, iface);
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}
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#define MAX_IFACE_LEN 33
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char *
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nm_netlink_index_to_iface (int idx)
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{
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struct nl_cache * cache;
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char * buf = NULL;
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cache = get_link_cache ();
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if (!cache)
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return NULL;
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buf = g_malloc0 (MAX_IFACE_LEN);
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if (buf == NULL) {
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nm_log_warn (LOGD_HW, "Not enough memory to allocate interface name buffer.");
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return NULL;
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}
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if (rtnl_link_i2name (cache, idx, buf, MAX_IFACE_LEN - 1) == NULL) {
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g_free (buf);
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buf = NULL;
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}
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return buf;
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}
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struct rtnl_link *
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nm_netlink_index_to_rtnl_link (int idx)
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{
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struct nl_cache *cache;
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cache = get_link_cache ();
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if (!cache)
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return NULL;
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return rtnl_link_get (cache, idx);
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}
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