1e7a0e21c9
This reworks sd-ndisc and networkd substantially to support IPv6 RA much more comprehensively. Since the API is extended quite a bit networkd has been ported over too, and the patch is not as straight-forward as one could wish. The rework includes: - Support for DNSSL, RDNSS and RA routing options in sd-ndisc and networkd. Two new configuration options have been added to networkd to make this configurable. - sd-ndisc now exposes an sd_ndisc_router object that encapsulates a full RA message, and has direct, friendly acessor functions for the singleton RA properties, as well as an iterative interface to iterate through known and unsupported options. The router object may either be retrieved from the wire, or generated from raw data. In many ways the sd-ndisc API now matches the sd-lldp API, except that no implicit database of seen data is kept. (Note that sd-ndisc actually had a half-written, but unused implementaiton of such a store, which is removed now.) - sd-ndisc will now collect the reception timestamps of RA, which is useful to make sd_ndisc_router fully descriptive of what it covers. Fixes: #1079
131 lines
5.2 KiB
C
131 lines
5.2 KiB
C
#ifndef foosdndiscfoo
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#define foosdndiscfoo
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/***
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This file is part of systemd.
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Copyright (C) 2014 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 <inttypes.h>
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#include <net/ethernet.h>
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#include <netinet/in.h>
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#include <sys/types.h>
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#include "sd-event.h"
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#include "_sd-common.h"
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_SD_BEGIN_DECLARATIONS;
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/* Neightbor Discovery Options, RFC 4861, Section 4.6 and
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* https://www.iana.org/assignments/icmpv6-parameters/icmpv6-parameters.xhtml#icmpv6-parameters-5 */
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enum {
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SD_NDISC_OPTION_SOURCE_LL_ADDRESS = 1,
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SD_NDISC_OPTION_TARGET_LL_ADDRESS = 2,
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SD_NDISC_OPTION_PREFIX_INFORMATION = 3,
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SD_NDISC_OPTION_MTU = 5,
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SD_NDISC_OPTION_ROUTE_INFORMATION = 24,
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SD_NDISC_OPTION_RDNSS = 25,
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SD_NDISC_OPTION_FLAGS_EXTENSION = 26,
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SD_NDISC_OPTION_DNSSL = 31,
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SD_NDISC_OPTION_CAPTIVE_PORTAL = 37,
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};
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/* Route preference, RFC 4191, Section 2.1 */
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enum {
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SD_NDISC_PREFERENCE_LOW = 3U,
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SD_NDISC_PREFERENCE_MEDIUM = 0U,
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SD_NDISC_PREFERENCE_HIGH = 1U,
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};
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typedef struct sd_ndisc sd_ndisc;
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typedef struct sd_ndisc_router sd_ndisc_router;
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typedef enum sd_ndisc_event {
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SD_NDISC_EVENT_TIMEOUT = 't',
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SD_NDISC_EVENT_ROUTER = 'r',
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} sd_ndisc_event;
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typedef void (*sd_ndisc_callback_t)(sd_ndisc *nd, sd_ndisc_event event, sd_ndisc_router *rt, void *userdata);
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int sd_ndisc_new(sd_ndisc **ret);
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sd_ndisc *sd_ndisc_ref(sd_ndisc *nd);
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sd_ndisc *sd_ndisc_unref(sd_ndisc *nd);
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int sd_ndisc_start(sd_ndisc *nd);
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int sd_ndisc_stop(sd_ndisc *nd);
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int sd_ndisc_attach_event(sd_ndisc *nd, sd_event *event, int64_t priority);
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int sd_ndisc_detach_event(sd_ndisc *nd);
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sd_event *sd_ndisc_get_event(sd_ndisc *nd);
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int sd_ndisc_set_callback(sd_ndisc *nd, sd_ndisc_callback_t cb, void *userdata);
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int sd_ndisc_set_ifindex(sd_ndisc *nd, int interface_index);
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int sd_ndisc_set_mac(sd_ndisc *nd, const struct ether_addr *mac_addr);
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int sd_ndisc_get_mtu(sd_ndisc *nd, uint32_t *ret);
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int sd_ndisc_get_hop_limit(sd_ndisc *nd, uint8_t *ret);
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int sd_ndisc_router_from_raw(sd_ndisc_router **ret, const void *raw, size_t raw_size);
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sd_ndisc_router *sd_ndisc_router_ref(sd_ndisc_router *rt);
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sd_ndisc_router *sd_ndisc_router_unref(sd_ndisc_router *rt);
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int sd_ndisc_router_get_address(sd_ndisc_router *rt, struct in6_addr *ret_addr);
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int sd_ndisc_router_get_timestamp(sd_ndisc_router *rt, clockid_t clock, uint64_t *ret);
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int sd_ndisc_router_get_raw(sd_ndisc_router *rt, const void **ret, size_t *size);
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int sd_ndisc_router_get_hop_limit(sd_ndisc_router *rt, uint8_t *ret);
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int sd_ndisc_router_get_flags(sd_ndisc_router *rt, uint64_t *ret_flags);
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int sd_ndisc_router_get_preference(sd_ndisc_router *rt, unsigned *ret);
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int sd_ndisc_router_get_lifetime(sd_ndisc_router *rt, uint16_t *ret_lifetime);
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int sd_ndisc_router_get_mtu(sd_ndisc_router *rt, uint32_t *ret);
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/* Generic option access */
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int sd_ndisc_router_option_rewind(sd_ndisc_router *rt);
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int sd_ndisc_router_option_next(sd_ndisc_router *rt);
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int sd_ndisc_router_option_get_type(sd_ndisc_router *rt, uint8_t *ret);
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int sd_ndisc_router_option_is_type(sd_ndisc_router *rt, uint8_t type);
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int sd_ndisc_router_option_get_raw(sd_ndisc_router *rt, const void **ret, size_t *size);
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/* Specific option access: SD_NDISC_OPTION_PREFIX_INFORMATION */
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int sd_ndisc_router_prefix_get_valid_lifetime(sd_ndisc_router *rt, uint32_t *ret);
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int sd_ndisc_router_prefix_get_preferred_lifetime(sd_ndisc_router *rt, uint32_t *ret);
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int sd_ndisc_router_prefix_get_flags(sd_ndisc_router *rt, uint8_t *ret);
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int sd_ndisc_router_prefix_get_address(sd_ndisc_router *rt, struct in6_addr *ret_addr);
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int sd_ndisc_router_prefix_get_prefixlen(sd_ndisc_router *rt, unsigned *prefixlen);
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/* Specific option access: SD_NDISC_OPTION_ROUTE_INFORMATION */
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int sd_ndisc_router_route_get_lifetime(sd_ndisc_router *rt, uint32_t *ret);
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int sd_ndisc_router_route_get_address(sd_ndisc_router *rt, struct in6_addr *ret_addr);
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int sd_ndisc_router_route_get_prefixlen(sd_ndisc_router *rt, unsigned *prefixlen);
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int sd_ndisc_router_route_get_preference(sd_ndisc_router *rt, unsigned *ret);
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/* Specific option access: SD_NDISC_OPTION_RDNSS */
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int sd_ndisc_router_rdnss_get_addresses(sd_ndisc_router *rt, const struct in6_addr **ret);
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int sd_ndisc_router_rdnss_get_lifetime(sd_ndisc_router *rt, uint32_t *ret);
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/* Specific option access: SD_NDISC_OPTION_DNSSL */
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int sd_ndisc_router_dnssl_get_domains(sd_ndisc_router *rt, char ***ret);
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int sd_ndisc_router_dnssl_get_lifetime(sd_ndisc_router *rt, uint32_t *ret);
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_SD_DEFINE_POINTER_CLEANUP_FUNC(sd_ndisc, sd_ndisc_unref);
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_SD_DEFINE_POINTER_CLEANUP_FUNC(sd_ndisc_router, sd_ndisc_router_unref);
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_SD_END_DECLARATIONS;
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#endif
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