[thirdparty/systemd.git] / src / network / networkd-radv.c

/* SPDX-License-Identifier: LGPL-2.1+ */
/***
  Copyright © 2017 Intel Corporation. All rights reserved.
***/

#include <netinet/icmp6.h>
#include <arpa/inet.h>

#include "networkd-address.h"
#include "networkd-manager.h"
#include "networkd-radv.h"
#include "parse-util.h"
#include "sd-radv.h"
#include "string-util.h"
#include "strv.h"

int config_parse_router_prefix_delegation(
                const char *unit,
                const char *filename,
                unsigned line,
                const char *section,
                unsigned section_line,
                const char *lvalue,
                int ltype,
                const char *rvalue,
                void *data,
                void *userdata) {

        Network *network = userdata;
        int d;

        assert(filename);
        assert(section);
        assert(lvalue);
        assert(rvalue);
        assert(data);

        if (streq(rvalue, "static"))
                network->router_prefix_delegation = RADV_PREFIX_DELEGATION_STATIC;
        else if (streq(rvalue, "dhcpv6"))
                network->router_prefix_delegation = RADV_PREFIX_DELEGATION_DHCP6;
        else {
                d = parse_boolean(rvalue);
                if (d > 0)
                        network->router_prefix_delegation = RADV_PREFIX_DELEGATION_BOTH;
                else
                        network->router_prefix_delegation = RADV_PREFIX_DELEGATION_NONE;

                if (d < 0)
                        log_syntax(unit, LOG_ERR, filename, line, -EINVAL, "Router prefix delegation '%s' is invalid, ignoring assignment: %m", rvalue);
        }

        return 0;
}

int config_parse_router_preference(const char *unit,
                                   const char *filename,
                                   unsigned line,
                                   const char *section,
                                   unsigned section_line,
                                   const char *lvalue,
                                   int ltype,
                                   const char *rvalue,
                                   void *data,
                                   void *userdata) {
        Network *network = userdata;

        assert(filename);
        assert(section);
        assert(lvalue);
        assert(rvalue);
        assert(data);

        if (streq(rvalue, "high"))
                network->router_preference = SD_NDISC_PREFERENCE_HIGH;
        else if (STR_IN_SET(rvalue, "medium", "normal", "default"))
                network->router_preference = SD_NDISC_PREFERENCE_MEDIUM;
        else if (streq(rvalue, "low"))
                network->router_preference = SD_NDISC_PREFERENCE_LOW;
        else
                log_syntax(unit, LOG_ERR, filename, line, -EINVAL, "Router preference '%s' is invalid, ignoring assignment: %m", rvalue);

        return 0;
}

void prefix_free(Prefix *prefix) {
        if (!prefix)
                return;

        if (prefix->network) {
                LIST_REMOVE(prefixes, prefix->network->static_prefixes, prefix);
                assert(prefix->network->n_static_prefixes > 0);
                prefix->network->n_static_prefixes--;

                if (prefix->section)
                        hashmap_remove(prefix->network->prefixes_by_section,
                                       prefix->section);
        }

        prefix->radv_prefix = sd_radv_prefix_unref(prefix->radv_prefix);

        free(prefix);
}

int prefix_new(Prefix **ret) {
        _cleanup_(prefix_freep) Prefix *prefix = NULL;

        prefix = new0(Prefix, 1);
        if (!prefix)
                return -ENOMEM;

        if (sd_radv_prefix_new(&prefix->radv_prefix) < 0)
                return -ENOMEM;

        *ret = TAKE_PTR(prefix);

        return 0;
}

int prefix_new_static(Network *network, const char *filename,
                      unsigned section_line, Prefix **ret) {
        _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
        _cleanup_(prefix_freep) Prefix *prefix = NULL;
        int r;

        assert(network);
        assert(ret);
        assert(!!filename == (section_line > 0));

        if (filename) {
                r = network_config_section_new(filename, section_line, &n);
                if (r < 0)
                        return r;

                if (section_line) {
                        prefix = hashmap_get(network->prefixes_by_section, n);
                        if (prefix) {
                                *ret = TAKE_PTR(prefix);

                                return 0;
                        }
                }
        }

        r = prefix_new(&prefix);
        if (r < 0)
                return r;

        if (filename) {
                prefix->section = TAKE_PTR(n);

                r = hashmap_put(network->prefixes_by_section, prefix->section,
                                prefix);
                if (r < 0)
                        return r;
        }

        prefix->network = network;
        LIST_APPEND(prefixes, network->static_prefixes, prefix);
        network->n_static_prefixes++;

        *ret = TAKE_PTR(prefix);

        return 0;
}

int config_parse_prefix(const char *unit,
                const char *filename,
                unsigned line,
                const char *section,
                unsigned section_line,
                const char *lvalue,
                int ltype,
                const char *rvalue,
                void *data,
                void *userdata) {

        Network *network = userdata;
        _cleanup_(prefix_freep) Prefix *p = NULL;
        uint8_t prefixlen = 64;
        union in_addr_union in6addr;
        int r;

        assert(filename);
        assert(section);
        assert(lvalue);
        assert(rvalue);
        assert(data);

        r = prefix_new_static(network, filename, section_line, &p);
        if (r < 0)
                return r;

        r = in_addr_prefix_from_string(rvalue, AF_INET6, &in6addr, &prefixlen);
        if (r < 0) {
                log_syntax(unit, LOG_ERR, filename, line, r, "Prefix is invalid, ignoring assignment: %s", rvalue);
                return 0;
        }

        if (sd_radv_prefix_set_prefix(p->radv_prefix, &in6addr.in6, prefixlen) < 0)
                return -EADDRNOTAVAIL;

        log_syntax(unit, LOG_INFO, filename, line, r, "Found prefix %s", rvalue);

        p = NULL;

        return 0;
}

int config_parse_prefix_flags(const char *unit,
                              const char *filename,
                              unsigned line,
                              const char *section,
                              unsigned section_line,
                              const char *lvalue,
                              int ltype,
                              const char *rvalue,
                              void *data,
                              void *userdata) {
        Network *network = userdata;
        _cleanup_(prefix_freep) Prefix *p = NULL;
        int r, val;

        assert(filename);
        assert(section);
        assert(lvalue);
        assert(rvalue);
        assert(data);

        r = prefix_new_static(network, filename, section_line, &p);
        if (r < 0)
                return r;

        r = parse_boolean(rvalue);
        if (r < 0) {
                log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse address flag, ignoring: %s", rvalue);
                return 0;
        }

        val = r;

        if (streq(lvalue, "OnLink"))
                r = sd_radv_prefix_set_onlink(p->radv_prefix, val);
        else if (streq(lvalue, "AddressAutoconfiguration"))
                r = sd_radv_prefix_set_address_autoconfiguration(p->radv_prefix, val);
        if (r < 0)
                return r;

        p = NULL;

        return 0;
}

int config_parse_prefix_lifetime(const char *unit,
                                 const char *filename,
                                 unsigned line,
                                 const char *section,
                                 unsigned section_line,
                                 const char *lvalue,
                                 int ltype,
                                 const char *rvalue,
                                 void *data,
                                 void *userdata) {
        Network *network = userdata;
        _cleanup_(prefix_freep) Prefix *p = NULL;
        usec_t usec;
        int r;

        assert(filename);
        assert(section);
        assert(lvalue);
        assert(rvalue);
        assert(data);

        r = prefix_new_static(network, filename, section_line, &p);
        if (r < 0)
                return r;

        r = parse_sec(rvalue, &usec);
        if (r < 0) {
                log_syntax(unit, LOG_ERR, filename, line, r, "Lifetime is invalid, ignoring assignment: %s", rvalue);
                return 0;
        }

        /* a value of 0xffffffff represents infinity */
        if (streq(lvalue, "PreferredLifetimeSec"))
                r = sd_radv_prefix_set_preferred_lifetime(p->radv_prefix,
                                                          DIV_ROUND_UP(usec, USEC_PER_SEC));
        else if (streq(lvalue, "ValidLifetimeSec"))
                r = sd_radv_prefix_set_valid_lifetime(p->radv_prefix,
                                                      DIV_ROUND_UP(usec, USEC_PER_SEC));
        if (r < 0)
                return r;

        p = NULL;

        return 0;
}

static int radv_get_ip6dns(Network *network, struct in6_addr **dns,
                           size_t *n_dns) {
        _cleanup_free_ struct in6_addr *addresses = NULL;
        size_t i, n_addresses = 0, n_allocated = 0;

        assert(network);
        assert(dns);
        assert(n_dns);

        for (i = 0; i < network->n_dns; i++) {
                union in_addr_union *addr;

                if (network->dns[i].family != AF_INET6)
                        continue;

                addr = &network->dns[i].address;

                if (in_addr_is_null(AF_INET6, addr) ||
                    in_addr_is_link_local(AF_INET6, addr) ||
                    in_addr_is_localhost(AF_INET6, addr))
                        continue;

                if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
                        return -ENOMEM;

                addresses[n_addresses++] = addr->in6;
        }

        if (addresses) {
                *dns = TAKE_PTR(addresses);

                *n_dns = n_addresses;
        }

        return n_addresses;
}

static int radv_set_dns(Link *link, Link *uplink) {
        _cleanup_free_ struct in6_addr *dns = NULL;
        size_t n_dns;
        usec_t lifetime_usec;
        int r;

        if (!link->network->router_emit_dns)
                return 0;

        if (link->network->router_dns) {
                dns = newdup(struct in6_addr, link->network->router_dns,
                             link->network->n_router_dns);
                if (dns == NULL)
                        return -ENOMEM;

                n_dns = link->network->n_router_dns;
                lifetime_usec = link->network->router_dns_lifetime_usec;

                goto set_dns;
        }

        lifetime_usec = SD_RADV_DEFAULT_DNS_LIFETIME_USEC;

        r = radv_get_ip6dns(link->network, &dns, &n_dns);
        if (r > 0)
                goto set_dns;

        if (uplink) {
                if (uplink->network == NULL) {
                        log_link_debug(uplink, "Cannot fetch DNS servers as uplink interface is not managed by us");
                        return 0;
                }

                r = radv_get_ip6dns(uplink->network, &dns, &n_dns);
                if (r > 0)
                        goto set_dns;
        }

        return 0;

 set_dns:
        return sd_radv_set_rdnss(link->radv,
                                 DIV_ROUND_UP(lifetime_usec, USEC_PER_SEC),
                                 dns, n_dns);
}

static int radv_set_domains(Link *link, Link *uplink) {
        char **search_domains;
        usec_t lifetime_usec;

        if (!link->network->router_emit_domains)
                return 0;

        search_domains = link->network->router_search_domains;
        lifetime_usec = link->network->router_dns_lifetime_usec;

        if (search_domains)
                goto set_domains;

        lifetime_usec = SD_RADV_DEFAULT_DNS_LIFETIME_USEC;

        search_domains = link->network->search_domains;
        if (search_domains)
                goto set_domains;

        if (uplink) {
                if (uplink->network == NULL) {
                        log_link_debug(uplink, "Cannot fetch DNS search domains as uplink interface is not managed by us");
                        return 0;
                }

                search_domains = uplink->network->search_domains;
                if (search_domains)
                        goto set_domains;
        }

        return 0;

 set_domains:
        return sd_radv_set_dnssl(link->radv,
                                 DIV_ROUND_UP(lifetime_usec, USEC_PER_SEC),
                                 search_domains);

}

int radv_emit_dns(Link *link) {
        Link *uplink;
        int r;

        uplink = manager_find_uplink(link->manager, link);

        r = radv_set_dns(link, uplink);
        if (r < 0)
                log_link_warning_errno(link, r, "Could not set RA DNS: %m");

        r = radv_set_domains(link, uplink);
        if (r < 0)
                log_link_warning_errno(link, r, "Could not set RA Domains: %m");

        return 0;
}

int radv_configure(Link *link) {
        int r;
        Prefix *p;

        assert(link);
        assert(link->network);

        r = sd_radv_new(&link->radv);
        if (r < 0)
                return r;

        r = sd_radv_attach_event(link->radv, NULL, 0);
        if (r < 0)
                return r;

        r = sd_radv_set_mac(link->radv, &link->mac);
        if (r < 0)
                return r;

        r = sd_radv_set_ifindex(link->radv, link->ifindex);
        if (r < 0)
                return r;

        r = sd_radv_set_managed_information(link->radv, link->network->router_managed);
        if (r < 0)
                return r;

        r = sd_radv_set_other_information(link->radv, link->network->router_other_information);
        if (r < 0)
                return r;

        /* a value of 0xffffffff represents infinity, 0x0 means this host is
           not a router */
        r = sd_radv_set_router_lifetime(link->radv,
                                        DIV_ROUND_UP(link->network->router_lifetime_usec, USEC_PER_SEC));
        if (r < 0)
                return r;

        if (link->network->router_lifetime_usec > 0) {
                r = sd_radv_set_preference(link->radv,
                                           link->network->router_preference);
                if (r < 0)
                        return r;
        }

        if (IN_SET(link->network->router_prefix_delegation,
                   RADV_PREFIX_DELEGATION_STATIC,
                   RADV_PREFIX_DELEGATION_BOTH)) {
                LIST_FOREACH(prefixes, p, link->network->static_prefixes) {
                        r = sd_radv_add_prefix(link->radv, p->radv_prefix, false);
                        if (r != -EEXIST && r < 0)
                                return r;
                }
        }

        return radv_emit_dns(link);
}
Commit	Line	Data
53e1b683	1	/* SPDX-License-Identifier: LGPL-2.1+ */
091214b6	2	/***
810adae9	3	Copyright © 2017 Intel Corporation. All rights reserved.
091214b6 PF	4	***/
	5
	6	#include <netinet/icmp6.h>
	7	#include <arpa/inet.h>
	8
	9	#include "networkd-address.h"
c555a358	10	#include "networkd-manager.h"
091214b6	11	#include "networkd-radv.h"
6e849e95	12	#include "parse-util.h"
091214b6	13	#include "sd-radv.h"
6e849e95	14	#include "string-util.h"
51517f9e	15	#include "strv.h"
6e849e95	16
9c3b99fe YW	17	int config_parse_router_prefix_delegation(
	18	const char *unit,
	19	const char *filename,
	20	unsigned line,
	21	const char *section,
	22	unsigned section_line,
	23	const char *lvalue,
	24	int ltype,
	25	const char *rvalue,
	26	void *data,
	27	void *userdata) {
	28
56a23cb4 PF	29	Network *network = userdata;
	30	int d;
	31
	32	assert(filename);
	33	assert(section);
	34	assert(lvalue);
	35	assert(rvalue);
	36	assert(data);
	37
	38	if (streq(rvalue, "static"))
	39	network->router_prefix_delegation = RADV_PREFIX_DELEGATION_STATIC;
	40	else if (streq(rvalue, "dhcpv6"))
	41	network->router_prefix_delegation = RADV_PREFIX_DELEGATION_DHCP6;
	42	else {
	43	d = parse_boolean(rvalue);
	44	if (d > 0)
	45	network->router_prefix_delegation = RADV_PREFIX_DELEGATION_BOTH;
	46	else
	47	network->router_prefix_delegation = RADV_PREFIX_DELEGATION_NONE;
	48
	49	if (d < 0)
	50	log_syntax(unit, LOG_ERR, filename, line, -EINVAL, "Router prefix delegation '%s' is invalid, ignoring assignment: %m", rvalue);
	51	}
	52
	53	return 0;
	54	}
	55
6e849e95 PF	56	int config_parse_router_preference(const char *unit,
	57	const char *filename,
	58	unsigned line,
	59	const char *section,
	60	unsigned section_line,
	61	const char *lvalue,
	62	int ltype,
	63	const char *rvalue,
	64	void *data,
	65	void *userdata) {
	66	Network *network = userdata;
	67
	68	assert(filename);
	69	assert(section);
	70	assert(lvalue);
	71	assert(rvalue);
	72	assert(data);
	73
	74	if (streq(rvalue, "high"))
	75	network->router_preference = SD_NDISC_PREFERENCE_HIGH;
	76	else if (STR_IN_SET(rvalue, "medium", "normal", "default"))
	77	network->router_preference = SD_NDISC_PREFERENCE_MEDIUM;
	78	else if (streq(rvalue, "low"))
	79	network->router_preference = SD_NDISC_PREFERENCE_LOW;
	80	else
	81	log_syntax(unit, LOG_ERR, filename, line, -EINVAL, "Router preference '%s' is invalid, ignoring assignment: %m", rvalue);
	82
	83	return 0;
	84	}
	85
	86	void prefix_free(Prefix *prefix) {
	87	if (!prefix)
	88	return;
	89
	90	if (prefix->network) {
	91	LIST_REMOVE(prefixes, prefix->network->static_prefixes, prefix);
	92	assert(prefix->network->n_static_prefixes > 0);
	93	prefix->network->n_static_prefixes--;
	94
	95	if (prefix->section)
	96	hashmap_remove(prefix->network->prefixes_by_section,
	97	prefix->section);
	98	}
	99
	100	prefix->radv_prefix = sd_radv_prefix_unref(prefix->radv_prefix);
	101
	102	free(prefix);
	103	}
	104
	105	int prefix_new(Prefix **ret) {
15b8332e	106	_cleanup_(prefix_freep) Prefix *prefix = NULL;
6e849e95 PF	107
	108	prefix = new0(Prefix, 1);
	109	if (!prefix)
	110	return -ENOMEM;
	111
	112	if (sd_radv_prefix_new(&prefix->radv_prefix) < 0)
	113	return -ENOMEM;
	114
ae2a15bc	115	*ret = TAKE_PTR(prefix);
6e849e95 PF	116
	117	return 0;
	118	}
	119
	120	int prefix_new_static(Network network, const char filename,
	121	unsigned section_line, Prefix **ret) {
8e766630 LP	122	_cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
8e766630 LP	123	_cleanup_(prefix_freep) Prefix *prefix = NULL;
6e849e95 PF	124	int r;
	125
	126	assert(network);
	127	assert(ret);
	128	assert(!!filename == (section_line > 0));
	129
	130	if (filename) {
	131	r = network_config_section_new(filename, section_line, &n);
	132	if (r < 0)
	133	return r;
	134
	135	if (section_line) {
	136	prefix = hashmap_get(network->prefixes_by_section, n);
	137	if (prefix) {
1cc6c93a	138	*ret = TAKE_PTR(prefix);
6e849e95 PF	139
	140	return 0;
	141	}
	142	}
	143	}
	144
	145	r = prefix_new(&prefix);
	146	if (r < 0)
	147	return r;
	148
	149	if (filename) {
1cc6c93a	150	prefix->section = TAKE_PTR(n);
6e849e95 PF	151
	152	r = hashmap_put(network->prefixes_by_section, prefix->section,
	153	prefix);
	154	if (r < 0)
	155	return r;
	156	}
	157
	158	prefix->network = network;
	159	LIST_APPEND(prefixes, network->static_prefixes, prefix);
	160	network->n_static_prefixes++;
	161
1cc6c93a	162	*ret = TAKE_PTR(prefix);
6e849e95 PF	163
	164	return 0;
	165	}
	166
	167	int config_parse_prefix(const char *unit,
	168	const char *filename,
	169	unsigned line,
	170	const char *section,
	171	unsigned section_line,
	172	const char *lvalue,
	173	int ltype,
	174	const char *rvalue,
	175	void *data,
	176	void *userdata) {
	177
	178	Network *network = userdata;
8e766630	179	_cleanup_(prefix_freep) Prefix *p = NULL;
6e849e95 PF	180	uint8_t prefixlen = 64;
	181	union in_addr_union in6addr;
	182	int r;
	183
	184	assert(filename);
	185	assert(section);
	186	assert(lvalue);
	187	assert(rvalue);
	188	assert(data);
	189
	190	r = prefix_new_static(network, filename, section_line, &p);
	191	if (r < 0)
	192	return r;
	193
	194	r = in_addr_prefix_from_string(rvalue, AF_INET6, &in6addr, &prefixlen);
	195	if (r < 0) {
	196	log_syntax(unit, LOG_ERR, filename, line, r, "Prefix is invalid, ignoring assignment: %s", rvalue);
	197	return 0;
	198	}
	199
	200	if (sd_radv_prefix_set_prefix(p->radv_prefix, &in6addr.in6, prefixlen) < 0)
	201	return -EADDRNOTAVAIL;
	202
	203	log_syntax(unit, LOG_INFO, filename, line, r, "Found prefix %s", rvalue);
	204
	205	p = NULL;
	206
	207	return 0;
	208	}
	209
	210	int config_parse_prefix_flags(const char *unit,
	211	const char *filename,
	212	unsigned line,
	213	const char *section,
	214	unsigned section_line,
	215	const char *lvalue,
	216	int ltype,
	217	const char *rvalue,
	218	void *data,
	219	void *userdata) {
	220	Network *network = userdata;
8e766630	221	_cleanup_(prefix_freep) Prefix *p = NULL;
6e849e95 PF	222	int r, val;
	223
	224	assert(filename);
	225	assert(section);
	226	assert(lvalue);
	227	assert(rvalue);
	228	assert(data);
	229
	230	r = prefix_new_static(network, filename, section_line, &p);
	231	if (r < 0)
	232	return r;
	233
	234	r = parse_boolean(rvalue);
	235	if (r < 0) {
	236	log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse address flag, ignoring: %s", rvalue);
	237	return 0;
	238	}
	239
	240	val = r;
	241
	242	if (streq(lvalue, "OnLink"))
	243	r = sd_radv_prefix_set_onlink(p->radv_prefix, val);
	244	else if (streq(lvalue, "AddressAutoconfiguration"))
	245	r = sd_radv_prefix_set_address_autoconfiguration(p->radv_prefix, val);
	246	if (r < 0)
	247	return r;
	248
	249	p = NULL;
	250
	251	return 0;
	252	}
	253
	254	int config_parse_prefix_lifetime(const char *unit,
	255	const char *filename,
	256	unsigned line,
	257	const char *section,
	258	unsigned section_line,
	259	const char *lvalue,
	260	int ltype,
	261	const char *rvalue,
	262	void *data,
	263	void *userdata) {
	264	Network *network = userdata;
8e766630	265	_cleanup_(prefix_freep) Prefix *p = NULL;
6e849e95 PF	266	usec_t usec;
	267	int r;
	268
	269	assert(filename);
	270	assert(section);
	271	assert(lvalue);
	272	assert(rvalue);
	273	assert(data);
	274
	275	r = prefix_new_static(network, filename, section_line, &p);
	276	if (r < 0)
	277	return r;
	278
	279	r = parse_sec(rvalue, &usec);
	280	if (r < 0) {
	281	log_syntax(unit, LOG_ERR, filename, line, r, "Lifetime is invalid, ignoring assignment: %s", rvalue);
	282	return 0;
	283	}
	284
	285	/* a value of 0xffffffff represents infinity */
	286	if (streq(lvalue, "PreferredLifetimeSec"))
	287	r = sd_radv_prefix_set_preferred_lifetime(p->radv_prefix,
	288	DIV_ROUND_UP(usec, USEC_PER_SEC));
	289	else if (streq(lvalue, "ValidLifetimeSec"))
	290	r = sd_radv_prefix_set_valid_lifetime(p->radv_prefix,
	291	DIV_ROUND_UP(usec, USEC_PER_SEC));
	292	if (r < 0)
	293	return r;
	294
	295	p = NULL;
	296
	297	return 0;
	298	}
091214b6	299
c555a358 PF	300	static int radv_get_ip6dns(Network network, struct in6_addr *dns,
	301	size_t *n_dns) {
	302	_cleanup_free_ struct in6_addr *addresses = NULL;
	303	size_t i, n_addresses = 0, n_allocated = 0;
	304
	305	assert(network);
	306	assert(dns);
	307	assert(n_dns);
	308
	309	for (i = 0; i < network->n_dns; i++) {
	310	union in_addr_union *addr;
	311
	312	if (network->dns[i].family != AF_INET6)
	313	continue;
	314
	315	addr = &network->dns[i].address;
	316
	317	if (in_addr_is_null(AF_INET6, addr) \|\|
	318	in_addr_is_link_local(AF_INET6, addr) \|\|
	319	in_addr_is_localhost(AF_INET6, addr))
	320	continue;
	321
	322	if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
	323	return -ENOMEM;
	324
	325	addresses[n_addresses++] = addr->in6;
	326	}
	327
	328	if (addresses) {
ae2a15bc	329	*dns = TAKE_PTR(addresses);
c555a358 PF	330
	331	*n_dns = n_addresses;
	332	}
	333
	334	return n_addresses;
	335	}
	336
	337	static int radv_set_dns(Link link, Link uplink) {
	338	_cleanup_free_ struct in6_addr *dns = NULL;
	339	size_t n_dns;
	340	usec_t lifetime_usec;
	341	int r;
	342
	343	if (!link->network->router_emit_dns)
	344	return 0;
	345
	346	if (link->network->router_dns) {
	347	dns = newdup(struct in6_addr, link->network->router_dns,
	348	link->network->n_router_dns);
	349	if (dns == NULL)
	350	return -ENOMEM;
	351
	352	n_dns = link->network->n_router_dns;
	353	lifetime_usec = link->network->router_dns_lifetime_usec;
	354
	355	goto set_dns;
	356	}
	357
	358	lifetime_usec = SD_RADV_DEFAULT_DNS_LIFETIME_USEC;
	359
	360	r = radv_get_ip6dns(link->network, &dns, &n_dns);
	361	if (r > 0)
	362	goto set_dns;
	363
	364	if (uplink) {
349a981d PF	365	if (uplink->network == NULL) {
	366	log_link_debug(uplink, "Cannot fetch DNS servers as uplink interface is not managed by us");
	367	return 0;
	368	}
	369
c555a358 PF	370	r = radv_get_ip6dns(uplink->network, &dns, &n_dns);
	371	if (r > 0)
	372	goto set_dns;
	373	}
	374
	375	return 0;
	376
	377	set_dns:
	378	return sd_radv_set_rdnss(link->radv,
	379	DIV_ROUND_UP(lifetime_usec, USEC_PER_SEC),
	380	dns, n_dns);
	381	}
	382
	383	static int radv_set_domains(Link link, Link uplink) {
	384	char **search_domains;
	385	usec_t lifetime_usec;
	386
	387	if (!link->network->router_emit_domains)
	388	return 0;
	389
	390	search_domains = link->network->router_search_domains;
	391	lifetime_usec = link->network->router_dns_lifetime_usec;
	392
	393	if (search_domains)
	394	goto set_domains;
	395
	396	lifetime_usec = SD_RADV_DEFAULT_DNS_LIFETIME_USEC;
	397
	398	search_domains = link->network->search_domains;
	399	if (search_domains)
	400	goto set_domains;
	401
	402	if (uplink) {
349a981d PF	403	if (uplink->network == NULL) {
	404	log_link_debug(uplink, "Cannot fetch DNS search domains as uplink interface is not managed by us");
	405	return 0;
	406	}
	407
c555a358 PF	408	search_domains = uplink->network->search_domains;
	409	if (search_domains)
	410	goto set_domains;
	411	}
	412
	413	return 0;
	414
	415	set_domains:
	416	return sd_radv_set_dnssl(link->radv,
	417	DIV_ROUND_UP(lifetime_usec, USEC_PER_SEC),
	418	search_domains);
	419
	420	}
	421
	422	int radv_emit_dns(Link *link) {
	423	Link *uplink;
	424	int r;
	425
	426	uplink = manager_find_uplink(link->manager, link);
	427
	428	r = radv_set_dns(link, uplink);
	429	if (r < 0)
	430	log_link_warning_errno(link, r, "Could not set RA DNS: %m");
	431
	432	r = radv_set_domains(link, uplink);
	433	if (r < 0)
	434	log_link_warning_errno(link, r, "Could not set RA Domains: %m");
	435
	436	return 0;
	437	}
	438
091214b6 PF	439	int radv_configure(Link *link) {
	440	int r;
	441	Prefix *p;
	442
	443	assert(link);
	444	assert(link->network);
	445
	446	r = sd_radv_new(&link->radv);
	447	if (r < 0)
	448	return r;
	449
	450	r = sd_radv_attach_event(link->radv, NULL, 0);
	451	if (r < 0)
	452	return r;
	453
	454	r = sd_radv_set_mac(link->radv, &link->mac);
	455	if (r < 0)
	456	return r;
	457
	458	r = sd_radv_set_ifindex(link->radv, link->ifindex);
	459	if (r < 0)
	460	return r;
	461
	462	r = sd_radv_set_managed_information(link->radv, link->network->router_managed);
	463	if (r < 0)
	464	return r;
	465
	466	r = sd_radv_set_other_information(link->radv, link->network->router_other_information);
	467	if (r < 0)
	468	return r;
	469
301a2fb9 PF	470	/* a value of 0xffffffff represents infinity, 0x0 means this host is
301a2fb9 PF	471	not a router */
091214b6	472	r = sd_radv_set_router_lifetime(link->radv,
945e3225	473	DIV_ROUND_UP(link->network->router_lifetime_usec, USEC_PER_SEC));
091214b6 PF	474	if (r < 0)
	475	return r;
	476
	477	if (link->network->router_lifetime_usec > 0) {
	478	r = sd_radv_set_preference(link->radv,
	479	link->network->router_preference);
	480	if (r < 0)
	481	return r;
	482	}
	483
56a23cb4 PF	484	if (IN_SET(link->network->router_prefix_delegation,
	485	RADV_PREFIX_DELEGATION_STATIC,
	486	RADV_PREFIX_DELEGATION_BOTH)) {
	487	LIST_FOREACH(prefixes, p, link->network->static_prefixes) {
d601b566	488	r = sd_radv_add_prefix(link->radv, p->radv_prefix, false);
56a23cb4 PF	489	if (r != -EEXIST && r < 0)
	490	return r;
	491	}
091214b6 PF	492	}
091214b6 PF	493
c555a358	494	return radv_emit_dns(link);
091214b6	495	}