| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| #pragma once |
| |
| /*** |
| Copyright © 2017 Intel Corporation. All rights reserved. |
| ***/ |
| |
| #include "sd-radv.h" |
| |
| #include "list.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) |
| /* 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) |
| |
| #define RADV_OPT_ROUTE_INFORMATION 24 |
| #define RADV_OPT_RDNSS 25 |
| #define RADV_OPT_DNSSL 31 |
| |
| 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 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); |
| |
| size_t n_rdnss; |
| struct sd_radv_opt_dns *rdnss; |
| struct sd_radv_opt_dns *dnssl; |
| }; |
| |
| #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; |
| }; |
| |
| #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__) |