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