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Diffstat (limited to 'src/libsystemd-network/radv-internal.h')
| -rw-r--r-- | src/libsystemd-network/radv-internal.h | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/src/libsystemd-network/radv-internal.h b/src/libsystemd-network/radv-internal.h new file mode 100644 index 0000000..1a26875 --- /dev/null +++ b/src/libsystemd-network/radv-internal.h @@ -0,0 +1,183 @@ +/* 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__) |