+// SPDX-License-Identifier: GPL-2.0-or-later
/* Router advertisement
* Copyright (C) 2005 6WIND <jean-mickael.guerin@6wind.com>
* Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra 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, or (at your option) any
- * later version.
- *
- * GNU Zebra 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; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _ZEBRA_RTADV_H
#define _ZEBRA_RTADV_H
+#include "zebra.h"
#include "vty.h"
-#include "zebra/interface.h"
+#include "typesafe.h"
+
+#include "zebra/zserv.h"
#ifdef __cplusplus
extern "C" {
#endif
-/* NB: RTADV is defined in zebra/interface.h above */
+struct interface;
+struct zebra_if;
+
#if defined(HAVE_RTADV)
+PREDECL_SORTLIST_UNIQ(adv_if_list);
+/* Structure which hold status of router advertisement. */
+struct rtadv {
+ int sock;
+
+ struct adv_if_list_head adv_if;
+ struct adv_if_list_head adv_msec_if;
+
+ struct thread *ra_read;
+ struct thread *ra_timer;
+};
+
+PREDECL_RBTREE_UNIQ(rtadv_prefixes);
+
+/* Router advertisement parameter. From RFC4861, RFC6275 and RFC4191. */
+struct rtadvconf {
+ /* A flag indicating whether or not the router sends periodic Router
+ Advertisements and responds to Router Solicitations.
+ Default: false */
+ int AdvSendAdvertisements;
+
+ /* The maximum time allowed between sending unsolicited multicast
+ Router Advertisements from the interface, in milliseconds.
+ MUST be no less than 70 ms [RFC6275 7.5] and no greater
+ than 1800000 ms [RFC4861 6.2.1].
+
+ Default: 600000 milliseconds */
+ int MaxRtrAdvInterval;
+#define RTADV_MAX_RTR_ADV_INTERVAL 600000
+
+ /* The minimum time allowed between sending unsolicited multicast
+ Router Advertisements from the interface, in milliseconds.
+ MUST be no less than 30 ms [RFC6275 7.5].
+ MUST be no greater than .75 * MaxRtrAdvInterval.
+
+ Default: 0.33 * MaxRtrAdvInterval */
+ int MinRtrAdvInterval; /* This field is currently unused. */
+#define RTADV_MIN_RTR_ADV_INTERVAL (0.33 * RTADV_MAX_RTR_ADV_INTERVAL)
+
+ /* Unsolicited Router Advertisements' interval timer. */
+ int AdvIntervalTimer;
+
+ /* The true/false value to be placed in the "Managed address
+ configuration" flag field in the Router Advertisement. See
+ [ADDRCONF].
+
+ Default: false */
+ int AdvManagedFlag;
+ struct timeval lastadvmanagedflag;
+
+
+ /* The true/false value to be placed in the "Other stateful
+ configuration" flag field in the Router Advertisement. See
+ [ADDRCONF].
+
+ Default: false */
+ int AdvOtherConfigFlag;
+ struct timeval lastadvotherconfigflag;
+
+ /* The value to be placed in MTU options sent by the router. A
+ value of zero indicates that no MTU options are sent.
+
+ Default: 0 */
+ int AdvLinkMTU;
+
+
+ /* The value to be placed in the Reachable Time field in the Router
+ Advertisement messages sent by the router. The value zero means
+ unspecified (by this router). MUST be no greater than 3,600,000
+ milliseconds (1 hour).
+
+ Default: 0 */
+ uint32_t AdvReachableTime;
+#define RTADV_MAX_REACHABLE_TIME 3600000
+ struct timeval lastadvreachabletime;
+
+ /* The value to be placed in the Retrans Timer field in the Router
+ Advertisement messages sent by the router. The value zero means
+ unspecified (by this router).
+
+ Default: 0 */
+ int AdvRetransTimer;
+ struct timeval lastadvretranstimer;
+
+ /* The default value to be placed in the Cur Hop Limit field in the
+ Router Advertisement messages sent by the router. The value
+ should be set to that current diameter of the Internet. The
+ value zero means unspecified (by this router).
+
+ Default: The value specified in the "Assigned Numbers" RFC
+ [ASSIGNED] that was in effect at the time of implementation. */
+ int AdvCurHopLimit;
+ struct timeval lastadvcurhoplimit;
+
+#define RTADV_DEFAULT_HOPLIMIT 64 /* 64 hops */
+
+ /* The value to be placed in the Router Lifetime field of Router
+ Advertisements sent from the interface, in seconds. MUST be
+ either zero or between MaxRtrAdvInterval and 9000 seconds. A
+ value of zero indicates that the router is not to be used as a
+ default router.
+
+ Default: 3 * MaxRtrAdvInterval */
+ int AdvDefaultLifetime;
+#define RTADV_MAX_RTRLIFETIME 9000 /* 2.5 hours */
+
+ /* A list of prefixes to be placed in Prefix Information options in
+ Router Advertisement messages sent from the interface.
+
+ Default: all prefixes that the router advertises via routing
+ protocols as being on-link for the interface from which the
+ advertisement is sent. The link-local prefix SHOULD NOT be
+ included in the list of advertised prefixes. */
+ struct rtadv_prefixes_head prefixes[1];
+
+ /* The true/false value to be placed in the "Home agent"
+ flag field in the Router Advertisement. See [RFC6275 7.1].
+
+ Default: false */
+ int AdvHomeAgentFlag;
+#ifndef ND_RA_FLAG_HOME_AGENT
+#define ND_RA_FLAG_HOME_AGENT 0x20
+#endif
+
+ /* The value to be placed in Home Agent Information option if Home
+ Flag is set.
+ Default: 0 */
+ int HomeAgentPreference;
+
+ /* The value to be placed in Home Agent Information option if Home
+ Flag is set. Lifetime (seconds) MUST not be greater than 18.2
+ hours.
+ The value 0 has special meaning: use of AdvDefaultLifetime value.
+
+ Default: 0 */
+ int HomeAgentLifetime;
+#define RTADV_MAX_HALIFETIME 65520 /* 18.2 hours */
+
+ /* The true/false value to insert or not an Advertisement Interval
+ option. See [RFC 6275 7.3]
+
+ Default: false */
+ int AdvIntervalOption;
+
+ /* The value to be placed in the Default Router Preference field of
+ a router advertisement. See [RFC 4191 2.1 & 2.2]
+
+ Default: 0 (medium) */
+ int DefaultPreference;
+#define RTADV_PREF_MEDIUM 0x0 /* Per RFC4191. */
+
+ /*
+ * List of recursive DNS servers to include in the RDNSS option.
+ * See [RFC8106 5.1]
+ *
+ * Default: empty list; do not emit RDNSS option
+ */
+ struct list *AdvRDNSSList;
+
+ /*
+ * List of DNS search domains to include in the DNSSL option.
+ * See [RFC8106 5.2]
+ *
+ * Default: empty list; do not emit DNSSL option
+ */
+ struct list *AdvDNSSLList;
+
+ /*
+ * rfc4861 states RAs must be sent at least 3 seconds apart.
+ * We allow faster retransmits to speed up convergence but can
+ * turn that capability off to meet the rfc if needed.
+ */
+ bool UseFastRexmit; /* True if fast rexmits are enabled */
+
+ uint8_t inFastRexmit; /* True if we're rexmits faster than usual */
+
+ /* Track if RA was configured by BGP or by the Operator or both */
+ uint8_t ra_configured; /* Was RA configured? */
+#define BGP_RA_CONFIGURED (1 << 0) /* BGP configured RA? */
+#define VTY_RA_CONFIGURED (1 << 1) /* Operator configured RA? */
+#define VTY_RA_INTERVAL_CONFIGURED \
+ (1 << 2) /* Operator configured RA interval */
+ int NumFastReXmitsRemain; /* Loaded first with number of fast
+ rexmits to do */
+
+#define RTADV_FAST_REXMIT_PERIOD 1 /* 1 sec */
+#define RTADV_NUM_FAST_REXMITS 4 /* Fast Rexmit RA 4 times on certain events \
+ */
+};
+
+struct rtadv_rdnss {
+ /* Address of recursive DNS server to advertise */
+ struct in6_addr addr;
+
+ /*
+ * Lifetime in seconds; all-ones means infinity, zero
+ * stop using it.
+ */
+ uint32_t lifetime;
+
+ /* If lifetime not set, use a default of 3*MaxRtrAdvInterval */
+ int lifetime_set;
+};
+
+/*
+ * [RFC1035 2.3.4] sets the maximum length of a domain name (a sequence of
+ * labels, each prefixed by a length octet) at 255 octets.
+ */
+#define RTADV_MAX_ENCODED_DOMAIN_NAME 255
+
+struct rtadv_dnssl {
+ /* Domain name without trailing root zone dot (NUL-terminated) */
+ char name[RTADV_MAX_ENCODED_DOMAIN_NAME - 1];
+
+ /* Name encoded as in [RFC1035 3.1] */
+ uint8_t encoded_name[RTADV_MAX_ENCODED_DOMAIN_NAME];
+
+ /* Actual length of encoded_name */
+ size_t encoded_len;
+
+ /* Lifetime as for RDNSS */
+ uint32_t lifetime;
+ int lifetime_set;
+};
+
/* Router advertisement prefix. */
struct rtadv_prefix {
+ struct rtadv_prefixes_item item;
+
/* Prefix to be advertised. */
struct prefix_ipv6 prefix;
#define ND_OPT_HA_INFORMATION 8 /* HA Information Option */
#endif
+
#ifndef HAVE_STRUCT_ND_OPT_ADV_INTERVAL
struct nd_opt_adv_interval { /* Advertisement interval option */
uint8_t nd_opt_ai_type;
#define nd_opt_ai_interval nd_opt_adv_interval_ival
#endif
#endif
+#ifndef ND_OPT_RTR_ADV_INTERVAL
+#define ND_OPT_RTR_ADV_INTERVAL 7
+#endif
+#ifndef ND_OPT_HOME_AGENT_INFO
+#define ND_OPT_HOME_AGENT_INFO 8
+#endif
#ifndef HAVE_STRUCT_ND_OPT_HOMEAGENT_INFO
struct nd_opt_homeagent_info { /* Home Agent info */
} __attribute__((__packed__));
#endif
-#endif /* HAVE_RTADV */
-
/*
* ipv6 nd prefixes can be manually defined, derived from the kernel interface
* configs or both. If both, manual flag/timer settings are used.
extern void rtadv_stop_ra(struct interface *ifp);
extern void rtadv_stop_ra_all(void);
extern void rtadv_cmd_init(void);
-extern void zebra_interface_radv_disable(ZAPI_HANDLER_ARGS);
-extern void zebra_interface_radv_enable(ZAPI_HANDLER_ARGS);
+extern void rtadv_if_init(struct zebra_if *zif);
+extern void rtadv_if_up(struct zebra_if *zif);
+extern void rtadv_if_fini(struct zebra_if *zif);
extern void rtadv_add_prefix(struct zebra_if *zif, const struct prefix_ipv6 *p);
extern void rtadv_delete_prefix(struct zebra_if *zif, const struct prefix *p);
+#else /* !HAVE_RTADV */
+struct rtadv {
+ /* empty structs aren't valid ISO C */
+ char dummy;
+};
+
+struct rtadvconf {
+ /* same again, empty structs aren't valid ISO C */
+ char dummy;
+};
+
+static inline void rtadv_vrf_init(struct zebra_vrf *zvrf)
+{
+}
+static inline void rtadv_vrf_terminate(struct zebra_vrf *zvrf)
+{
+}
+static inline void rtadv_cmd_init(void)
+{
+}
+static inline void rtadv_if_init(struct zebra_if *zif)
+{
+}
+static inline void rtadv_if_up(struct zebra_if *zif)
+{
+}
+static inline void rtadv_if_fini(struct zebra_if *zif)
+{
+}
+static inline void rtadv_add_prefix(struct zebra_if *zif,
+ const struct prefix_ipv6 *p)
+{
+}
+static inline void rtadv_delete_prefix(struct zebra_if *zif,
+ const struct prefix *p)
+{
+}
+static inline void rtadv_stop_ra(struct interface *ifp)
+{
+}
+static inline void rtadv_stop_ra_all(void)
+{
+}
+#endif
+
+extern void zebra_interface_radv_disable(ZAPI_HANDLER_ARGS);
+extern void zebra_interface_radv_enable(ZAPI_HANDLER_ARGS);
+
+extern uint32_t rtadv_get_interfaces_configured_from_bgp(void);
+extern bool rtadv_compiled_in(void);
+
#ifdef __cplusplus
}
#endif
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