204fb681f6
Router Advertisements are sent uniformly distributed between a minimum and maximum time according to RFC 4861, Section 6.2.4. Default values from RFC 4861 are for now used as minimum and maximum Router Advertisement timeouts. When stopping, a Router Advertisement with a router lifetime set to zero is sent in order to inform any nodes that the interface on this host no longer is a router.
87 lines
2.7 KiB
C
87 lines
2.7 KiB
C
#pragma once
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/***
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This file is part of systemd.
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Copyright (C) 2017 Intel Corporation. All rights reserved.
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "sd-radv.h"
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#include "log.h"
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#include "list.h"
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#include "sparse-endian.h"
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#define SD_RADV_DEFAULT_MIN_TIMEOUT_USEC (200*USEC_PER_SEC)
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#define SD_RADV_DEFAULT_MAX_TIMEOUT_USEC (600*USEC_PER_SEC)
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assert_cc(SD_RADV_DEFAULT_MIN_TIMEOUT_USEC <= SD_RADV_DEFAULT_MAX_TIMEOUT_USEC)
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#define SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC (16*USEC_PER_SEC)
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#define SD_RADV_MAX_INITIAL_RTR_ADVERTISEMENTS 3
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#define SD_RADV_MAX_FINAL_RTR_ADVERTISEMENTS 3
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#define SD_RADV_MIN_DELAY_BETWEEN_RAS 3
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#define SD_RADV_MAX_RA_DELAY_TIME_USEC (500*USEC_PER_MSEC)
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enum RAdvState {
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SD_RADV_STATE_IDLE = 0,
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SD_RADV_STATE_ADVERTISING = 1,
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};
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typedef enum RAdvState RAdvState;
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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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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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uint16_t lifetime;
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unsigned ra_sent;
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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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};
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struct sd_radv_prefix {
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unsigned n_ref;
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struct {
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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 valid_lifetime;
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be32_t preferred_lifetime;
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uint32_t reserved;
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struct in6_addr in6_addr;
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} _packed_ opt;
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LIST_FIELDS(struct sd_radv_prefix, prefix);
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};
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#define log_radv_full(level, error, fmt, ...) log_internal(level, error, __FILE__, __LINE__, __func__, "RADV: " fmt, ##__VA_ARGS__)
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#define log_radv_errno(error, fmt, ...) log_radv_full(LOG_DEBUG, error, fmt, ##__VA_ARGS__)
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#define log_radv_warning_errno(error, fmt, ...) log_radv_full(LOG_WARNING, error, fmt, ##__VA_ARGS__)
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#define log_radv(fmt, ...) log_radv_errno(0, fmt, ##__VA_ARGS__)
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