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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once
/***
Copyright © 2017 Intel Corporation. All rights reserved.
***/
#include <netinet/icmp6.h>
#include "sd-radv.h"
#include "list.h"
#include "ndisc-protocol.h"
#include "network-common.h"
#include "sparse-endian.h"
#include "time-util.h"
/* RFC 4861 section 6.2.1.
* MaxRtrAdvInterval
* The maximum time allowed between sending unsolicited multicast Router Advertisements from the
* interface, in seconds. MUST be no less than 4 seconds and no greater than 1800 seconds.
* Default: 600 seconds */
#define RADV_MIN_MAX_TIMEOUT_USEC (4 * USEC_PER_SEC)
#define RADV_MAX_MAX_TIMEOUT_USEC (1800 * USEC_PER_SEC)
#define RADV_DEFAULT_MAX_TIMEOUT_USEC (600 * USEC_PER_SEC)
/* RFC 4861 section 6.2.1.
* MinRtrAdvInterval
* The minimum time allowed between sending unsolicited multicast Router Advertisements from the
* interface, in seconds. MUST be no less than 3 seconds and no greater than .75 * MaxRtrAdvInterval.
* Default: 0.33 * MaxRtrAdvInterval If MaxRtrAdvInterval >= 9 seconds; otherwise, the Default is
* MaxRtrAdvInterval (Note, this should be a typo. We use 0.75 * MaxRtrAdvInterval). */
#define RADV_MIN_MIN_TIMEOUT_USEC (3 * USEC_PER_SEC)
/* RFC 4861 section 6.2.4.
* AdvDefaultLifetime
* 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. These limits may be overridden by
* specific documents that describe how IPv6 operates over different link layers. For instance, in a
* point-to-point link the peers may have enough information about the number and status of devices at
* the other end so that advertisements are needed less frequently.
* Default: 3 * MaxRtrAdvInterval */
#define RADV_MIN_ROUTER_LIFETIME_USEC RADV_MIN_MAX_TIMEOUT_USEC
#define RADV_MAX_ROUTER_LIFETIME_USEC (9000 * USEC_PER_SEC)
#define RADV_DEFAULT_ROUTER_LIFETIME_USEC (3 * RADV_DEFAULT_MAX_TIMEOUT_USEC)
/* RFC 4861 section 4.2.
* Retrans Timer
* 32-bit unsigned integer. The time, in milliseconds. */
#define RADV_MAX_RETRANSMIT_USEC (UINT32_MAX * USEC_PER_MSEC)
/* draft-ietf-6man-slaac-renum-02 section 4.1.1.
* AdvPreferredLifetime: max(AdvDefaultLifetime, 3 * MaxRtrAdvInterval)
* AdvValidLifetime: 2 * AdvPreferredLifetime */
#define RADV_DEFAULT_PREFERRED_LIFETIME_USEC CONST_MAX(RADV_DEFAULT_ROUTER_LIFETIME_USEC, 3 * RADV_DEFAULT_MAX_TIMEOUT_USEC)
#define RADV_DEFAULT_VALID_LIFETIME_USEC (2 * RADV_DEFAULT_PREFERRED_LIFETIME_USEC)
/* RFC 4861 section 10.
* MAX_INITIAL_RTR_ADVERT_INTERVAL 16 seconds
* MAX_INITIAL_RTR_ADVERTISEMENTS 3 transmissions
* MAX_FINAL_RTR_ADVERTISEMENTS 3 transmissions
* MIN_DELAY_BETWEEN_RAS 3 seconds
* MAX_RA_DELAY_TIME .5 seconds */
#define RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC (16 * USEC_PER_SEC)
#define RADV_MAX_INITIAL_RTR_ADVERTISEMENTS 3
#define RADV_MAX_FINAL_RTR_ADVERTISEMENTS 3
#define RADV_MIN_DELAY_BETWEEN_RAS 3
#define RADV_MAX_RA_DELAY_TIME_USEC (500 * USEC_PER_MSEC)
/* From RFC 8781 section 4.1
* By default, the value of the Scaled Lifetime field SHOULD be set to the lesser of 3 x MaxRtrAdvInterval */
#define RADV_PREF64_DEFAULT_LIFETIME_USEC (3 * RADV_DEFAULT_MAX_TIMEOUT_USEC)
#define RADV_RDNSS_MAX_LIFETIME_USEC (UINT32_MAX * USEC_PER_SEC)
#define RADV_DNSSL_MAX_LIFETIME_USEC (UINT32_MAX * USEC_PER_SEC)
/* rfc6275 7.4 Neighbor Discovery Home Agent Lifetime.
* The default value is the same as the Router Lifetime.
* The maximum value corresponds to 18.2 hours. 0 MUST NOT be used. */
#define RADV_HOME_AGENT_MAX_LIFETIME_USEC (UINT16_MAX * USEC_PER_SEC)
#define RADV_OPT_ROUTE_INFORMATION 24
#define RADV_OPT_RDNSS 25
#define RADV_OPT_DNSSL 31
/* Pref64 option type (RFC8781, section 4) */
#define RADV_OPT_PREF64 38
enum RAdvState {
RADV_STATE_IDLE = 0,
RADV_STATE_ADVERTISING = 1,
};
typedef enum RAdvState RAdvState;
struct sd_radv_opt_dns {
uint8_t type;
uint8_t length;
uint16_t reserved;
be32_t lifetime;
} _packed_;
struct sd_radv {
unsigned n_ref;
RAdvState state;
int ifindex;
char *ifname;
sd_event *event;
int event_priority;
struct ether_addr mac_addr;
uint8_t hop_limit;
uint8_t flags;
uint32_t mtu;
usec_t retransmit_usec;
usec_t lifetime_usec; /* timespan */
int fd;
unsigned ra_sent;
sd_event_source *recv_event_source;
sd_event_source *timeout_event_source;
unsigned n_prefixes;
LIST_HEAD(sd_radv_prefix, prefixes);
unsigned n_route_prefixes;
LIST_HEAD(sd_radv_route_prefix, route_prefixes);
unsigned n_pref64_prefixes;
LIST_HEAD(sd_radv_pref64_prefix, pref64_prefixes);
size_t n_rdnss;
struct sd_radv_opt_dns *rdnss;
struct sd_radv_opt_dns *dnssl;
/* Mobile IPv6 extension: Home Agent Info. */
struct nd_opt_home_agent_info home_agent;
};
#define radv_prefix_opt__contents { \
uint8_t type; \
uint8_t length; \
uint8_t prefixlen; \
uint8_t flags; \
be32_t lifetime_valid; \
be32_t lifetime_preferred; \
uint32_t reserved; \
struct in6_addr in6_addr; \
}
struct radv_prefix_opt radv_prefix_opt__contents;
/* We need the opt substructure to be packed, because we use it in send(). But
* if we use _packed_, this means that the structure cannot be used directly in
* normal code in general, because the fields might not be properly aligned.
* But in this particular case, the structure is defined in a way that gives
* proper alignment, even without the explicit _packed_ attribute. To appease
* the compiler we use the "unpacked" structure, but we also verify that
* structure contains no holes, so offsets are the same when _packed_ is used.
*/
struct radv_prefix_opt__packed radv_prefix_opt__contents _packed_;
assert_cc(sizeof(struct radv_prefix_opt) == sizeof(struct radv_prefix_opt__packed));
struct sd_radv_prefix {
unsigned n_ref;
struct radv_prefix_opt opt;
LIST_FIELDS(struct sd_radv_prefix, prefix);
/* These are timespans, NOT points in time. */
usec_t lifetime_valid_usec;
usec_t lifetime_preferred_usec;
/* These are points in time specified with clock_boottime_or_monotonic(), NOT timespans. */
usec_t valid_until;
usec_t preferred_until;
};
#define radv_route_prefix_opt__contents { \
uint8_t type; \
uint8_t length; \
uint8_t prefixlen; \
uint8_t flags_reserved; \
be32_t lifetime; \
struct in6_addr in6_addr; \
}
struct radv_route_prefix_opt radv_route_prefix_opt__contents;
struct radv_route_prefix_opt__packed radv_route_prefix_opt__contents _packed_;
assert_cc(sizeof(struct radv_route_prefix_opt) == sizeof(struct radv_route_prefix_opt__packed));
struct sd_radv_route_prefix {
unsigned n_ref;
struct radv_route_prefix_opt opt;
LIST_FIELDS(struct sd_radv_route_prefix, prefix);
/* This is a timespan, NOT a point in time. */
usec_t lifetime_usec;
/* This is a point in time specified with clock_boottime_or_monotonic(), NOT a timespan. */
usec_t valid_until;
};
struct sd_radv_pref64_prefix {
unsigned n_ref;
struct nd_opt_prefix64_info opt;
struct in6_addr in6_addr;
uint8_t prefixlen;
usec_t lifetime_usec;
LIST_FIELDS(struct sd_radv_pref64_prefix, prefix);
};
#define log_radv_errno(radv, error, fmt, ...) \
log_interface_prefix_full_errno( \
"RADV: ", \
sd_radv, radv, \
error, fmt, ##__VA_ARGS__)
#define log_radv(radv, fmt, ...) \
log_interface_prefix_full_errno_zerook( \
"RADV: ", \
sd_radv, radv, \
0, fmt, ##__VA_ARGS__)
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