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When enabling IPv6 on all interfaces, we may get the host Router Advertisement routes discarded. To avoid this, the user needs to set accept_ra to 2 for the interfaces with such routes. See https://www.kernel.org/doc/Documentation/networking/ip-sysctl.txt on this topic. To avoid user mistakenly losing routes on their hosts, check accept_ra values before enabling IPv6 forwarding. If a RA route is detected, but neither the corresponding device nor global accept_ra is set to 2, the network will fail to start.
101 lines
3.9 KiB
C
101 lines
3.9 KiB
C
/*
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* Copyright (C) 2007-2016 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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* Authors:
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* Mark McLoughlin <markmc@redhat.com>
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* Daniel P. Berrange <berrange@redhat.com>
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*/
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#ifndef __VIR_NETDEVIP_H__
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# define __VIR_NETDEVIP_H__
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# include "virsocketaddr.h"
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typedef struct _virNetDevIPAddr virNetDevIPAddr;
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typedef virNetDevIPAddr *virNetDevIPAddrPtr;
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struct _virNetDevIPAddr {
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virSocketAddr address; /* ipv4 or ipv6 address */
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virSocketAddr peer; /* ipv4 or ipv6 address of peer */
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unsigned int prefix; /* number of 1 bits in the netmask */
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};
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typedef struct _virNetDevIPRoute virNetDevIPRoute;
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typedef virNetDevIPRoute *virNetDevIPRoutePtr;
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struct _virNetDevIPRoute {
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char *family; /* ipv4 or ipv6 - default is ipv4 */
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virSocketAddr address; /* Routed Network IP address */
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/* One or the other of the following two will be used for a given
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* Network address, but never both. The parser guarantees this.
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* The virSocketAddrGetIPPrefix() can be used to get a
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* valid prefix.
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*/
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virSocketAddr netmask; /* ipv4 - either netmask or prefix specified */
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unsigned int prefix; /* ipv6 - only prefix allowed */
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bool has_prefix; /* prefix= was specified */
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unsigned int metric; /* value for metric (defaults to 1) */
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bool has_metric; /* metric= was specified */
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virSocketAddr gateway; /* gateway IP address for ip-route */
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};
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/* A full set of all IP config info for a network device */
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typedef struct _virNetDevIPInfo virNetDevIPInfo;
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typedef virNetDevIPInfo *virNetDevIPInfoPtr;
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struct _virNetDevIPInfo {
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size_t nips;
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virNetDevIPAddrPtr *ips;
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size_t nroutes;
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virNetDevIPRoutePtr *routes;
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};
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/* manipulating/querying the netdev */
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int virNetDevIPAddrAdd(const char *ifname,
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virSocketAddr *addr,
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virSocketAddr *peer,
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unsigned int prefix)
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ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
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int virNetDevIPRouteAdd(const char *ifname,
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virSocketAddrPtr addr,
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unsigned int prefix,
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virSocketAddrPtr gateway,
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unsigned int metric)
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ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(4)
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ATTRIBUTE_RETURN_CHECK;
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int virNetDevIPAddrDel(const char *ifname,
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virSocketAddr *addr,
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unsigned int prefix)
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ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
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int virNetDevIPAddrGet(const char *ifname, virSocketAddrPtr addr)
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ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
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int virNetDevIPWaitDadFinish(virSocketAddrPtr *addrs, size_t count)
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ATTRIBUTE_NONNULL(1);
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bool virNetDevIPCheckIPv6Forwarding(void);
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/* virNetDevIPRoute object */
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void virNetDevIPRouteFree(virNetDevIPRoutePtr def);
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virSocketAddrPtr virNetDevIPRouteGetAddress(virNetDevIPRoutePtr def);
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int virNetDevIPRouteGetPrefix(virNetDevIPRoutePtr def);
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unsigned int virNetDevIPRouteGetMetric(virNetDevIPRoutePtr def);
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virSocketAddrPtr virNetDevIPRouteGetGateway(virNetDevIPRoutePtr def);
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/* virNetDevIPInfo object */
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void virNetDevIPInfoClear(virNetDevIPInfoPtr ip);
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int virNetDevIPInfoAddToDev(const char *ifname,
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virNetDevIPInfo const *ipInfo);
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#endif /* __VIR_NETDEVIP_H__ */
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