[thirdparty/systemd.git] / src / libsystemd-network / sd-ndisc-router.c

/* SPDX-License-Identifier: LGPL-2.1-or-later */
/***
  Copyright © 2014 Intel Corporation. All rights reserved.
***/

#include <netinet/icmp6.h>

#include "sd-ndisc.h"

#include "alloc-util.h"
#include "ndisc-internal.h"
#include "ndisc-router-internal.h"
#include "string-table.h"

static sd_ndisc_router* ndisc_router_free(sd_ndisc_router *rt) {
        if (!rt)
                return NULL;

        icmp6_packet_unref(rt->packet);
        set_free(rt->options);
        return mfree(rt);
}

DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_ndisc_router, sd_ndisc_router, ndisc_router_free);

sd_ndisc_router* ndisc_router_new(ICMP6Packet *packet) {
        sd_ndisc_router *rt;

        assert(packet);

        rt = new(sd_ndisc_router, 1);
        if (!rt)
                return NULL;

        *rt = (sd_ndisc_router) {
                .n_ref = 1,
                .packet = icmp6_packet_ref(packet),
                .iterator = ITERATOR_FIRST,
        };

        return rt;
}

int sd_ndisc_router_set_sender_address(sd_ndisc_router *rt, const struct in6_addr *addr) {
        assert_return(rt, -EINVAL);

        return icmp6_packet_set_sender_address(rt->packet, addr);
}

int sd_ndisc_router_get_sender_address(sd_ndisc_router *rt, struct in6_addr *ret) {
        assert_return(rt, -EINVAL);

        return icmp6_packet_get_sender_address(rt->packet, ret);
}

int sd_ndisc_router_get_timestamp(sd_ndisc_router *rt, clockid_t clock, uint64_t *ret) {
        assert_return(rt, -EINVAL);
        assert_return(ret, -EINVAL);

        return icmp6_packet_get_timestamp(rt->packet, clock, ret);
}

#define DEFINE_GET_TIMESTAMP(name)                                      \
        int sd_ndisc_router_##name##_timestamp(                         \
                        sd_ndisc_router *rt,                            \
                        clockid_t clock,                                \
                        uint64_t *ret) {                                \
                                                                        \
                usec_t s, t;                                            \
                int r;                                                  \
                                                                        \
                assert_return(rt, -EINVAL);                             \
                assert_return(ret, -EINVAL);                            \
                                                                        \
                r = sd_ndisc_router_##name(rt, &s);                     \
                if (r < 0)                                              \
                        return r;                                       \
                                                                        \
                r = sd_ndisc_router_get_timestamp(rt, clock, &t);       \
                if (r < 0)                                              \
                        return r;                                       \
                                                                        \
                *ret = time_span_to_stamp(s, t);                        \
                return 0;                                               \
        }

DEFINE_GET_TIMESTAMP(get_lifetime);
DEFINE_GET_TIMESTAMP(prefix_get_valid_lifetime);
DEFINE_GET_TIMESTAMP(prefix_get_preferred_lifetime);
DEFINE_GET_TIMESTAMP(route_get_lifetime);
DEFINE_GET_TIMESTAMP(rdnss_get_lifetime);
DEFINE_GET_TIMESTAMP(dnssl_get_lifetime);
DEFINE_GET_TIMESTAMP(prefix64_get_lifetime);

int ndisc_router_parse(sd_ndisc *nd, sd_ndisc_router *rt) {
        const struct nd_router_advert *a;
        int r;

        assert(rt);
        assert(rt->packet);

        if (rt->packet->raw_size < sizeof(struct nd_router_advert))
                return log_ndisc_errno(nd, SYNTHETIC_ERRNO(EBADMSG),
                                       "Too small to be a router advertisement, ignoring.");

        a = (const struct nd_router_advert*) rt->packet->raw_packet;
        assert(a->nd_ra_type == ND_ROUTER_ADVERT);
        assert(a->nd_ra_code == 0);

        rt->hop_limit = a->nd_ra_curhoplimit;
        rt->flags = a->nd_ra_flags_reserved; /* the first 8 bits */
        rt->lifetime_usec = be16_sec_to_usec(a->nd_ra_router_lifetime, /* max_as_infinity = */ false);
        rt->reachable_time_usec = be32_msec_to_usec(a->nd_ra_reachable, /* mas_as_infinity = */ false);
        rt->retransmission_time_usec = be32_msec_to_usec(a->nd_ra_retransmit, /* max_as_infinity = */ false);

        /* RFC 4191 section 2.2
         * Prf (Default Router Preference)
         * 2-bit signed integer. Indicates whether to prefer this router over other default routers. If the
         * Router Lifetime is zero, the preference value MUST be set to (00) by the sender and MUST be
         * ignored by the receiver. If the Reserved (10) value is received, the receiver MUST treat the value
         * as if it were (00). */
        rt->preference = (rt->flags >> 3) & 3;
        if (rt->preference == SD_NDISC_PREFERENCE_RESERVED)
                rt->preference = SD_NDISC_PREFERENCE_MEDIUM;

        r = ndisc_parse_options(rt->packet, &rt->options);
        if (r < 0)
                return log_ndisc_errno(nd, r, "Failed to parse NDisc options in router advertisement message, ignoring: %m");

        return 0;
}

int sd_ndisc_router_get_hop_limit(sd_ndisc_router *rt, uint8_t *ret) {
        assert_return(rt, -EINVAL);
        assert_return(ret, -EINVAL);

        *ret = rt->hop_limit;
        return 0;
}

int sd_ndisc_router_get_reachable_time(sd_ndisc_router *rt, uint64_t *ret) {
        assert_return(rt, -EINVAL);
        assert_return(ret, -EINVAL);

        *ret = rt->reachable_time_usec;
        return 0;
}

int sd_ndisc_router_get_retransmission_time(sd_ndisc_router *rt, uint64_t *ret) {
        assert_return(rt, -EINVAL);
        assert_return(ret, -EINVAL);

        *ret = rt->retransmission_time_usec;
        return 0;
}

int sd_ndisc_router_get_flags(sd_ndisc_router *rt, uint64_t *ret) {
        assert_return(rt, -EINVAL);
        assert_return(ret, -EINVAL);

        sd_ndisc_option *p = ndisc_option_get_by_type(rt->options, SD_NDISC_OPTION_FLAGS_EXTENSION);

        *ret = rt->flags | (p ? p->extended_flags : 0);
        return 0;
}

int ndisc_router_flags_to_string(uint64_t flags, char **ret) {
        _cleanup_free_ char *s = NULL;

        assert(ret);

        if (FLAGS_SET(flags, ND_RA_FLAG_MANAGED) &&
            !strextend_with_separator(&s, ", ", "managed"))
                return -ENOMEM;

        if (FLAGS_SET(flags, ND_RA_FLAG_OTHER) &&
            !strextend_with_separator(&s, ", ", "other"))
                return -ENOMEM;

        if (FLAGS_SET(flags, ND_RA_FLAG_HOME_AGENT) &&
            !strextend_with_separator(&s, ", ", "home-agent"))
                return -ENOMEM;

        *ret = TAKE_PTR(s);
        return 0;
}

int sd_ndisc_router_get_lifetime(sd_ndisc_router *rt, uint64_t *ret) {
        assert_return(rt, -EINVAL);

        if (ret)
                *ret = rt->lifetime_usec;

        return rt->lifetime_usec > 0; /* Indicate if the router is still valid or not. */
}

int sd_ndisc_router_get_preference(sd_ndisc_router *rt, uint8_t *ret) {
        assert_return(rt, -EINVAL);
        assert_return(ret, -EINVAL);

        *ret = rt->preference;
        return 0;
}

static const char* const ndisc_router_preference_table[] = {
        [SD_NDISC_PREFERENCE_LOW]    = "low",
        [SD_NDISC_PREFERENCE_MEDIUM] = "medium",
        [SD_NDISC_PREFERENCE_HIGH]   = "high",
};

DEFINE_STRING_TABLE_LOOKUP_TO_STRING(ndisc_router_preference, int);

int sd_ndisc_router_get_sender_mac(sd_ndisc_router *rt, struct ether_addr *ret) {
        assert_return(rt, -EINVAL);

        return ndisc_option_get_mac(rt->options, SD_NDISC_OPTION_SOURCE_LL_ADDRESS, ret);
}

int sd_ndisc_router_get_mtu(sd_ndisc_router *rt, uint32_t *ret) {
        assert_return(rt, -EINVAL);
        assert_return(ret, -EINVAL);

        sd_ndisc_option *p = ndisc_option_get_by_type(rt->options, SD_NDISC_OPTION_MTU);
        if (!p)
                return -ENODATA;

        *ret = p->mtu;
        return 0;
}

int sd_ndisc_router_get_captive_portal(sd_ndisc_router *rt, const char **ret) {
        assert_return(rt, -EINVAL);
        assert_return(ret, -EINVAL);

        sd_ndisc_option *p = ndisc_option_get_by_type(rt->options, SD_NDISC_OPTION_CAPTIVE_PORTAL);
        if (!p)
                return -ENODATA;

        *ret = p->captive_portal;
        return 0;
}

int sd_ndisc_router_option_rewind(sd_ndisc_router *rt) {
        assert_return(rt, -EINVAL);

        rt->iterator = ITERATOR_FIRST;
        return sd_ndisc_router_option_next(rt);
}

int sd_ndisc_router_option_next(sd_ndisc_router *rt) {
        assert_return(rt, -EINVAL);

        return set_iterate(rt->options, &rt->iterator, (void**) &rt->current_option);
}

int sd_ndisc_router_option_get_type(sd_ndisc_router *rt, uint8_t *ret) {
        assert_return(rt, -EINVAL);
        assert_return(ret, -EINVAL);

        if (!rt->current_option)
                return -ENODATA;

        *ret = rt->current_option->type;
        return 0;
}

int sd_ndisc_router_option_is_type(sd_ndisc_router *rt, uint8_t type) {
        uint8_t t;
        int r;

        assert_return(rt, -EINVAL);

        r = sd_ndisc_router_option_get_type(rt, &t);
        if (r < 0)
                return r;

        return t == type;
}

int sd_ndisc_router_option_get_raw(sd_ndisc_router *rt, const uint8_t **ret, size_t *ret_size) {
        assert_return(rt, -EINVAL);

        if (!rt->current_option)
                return -ENODATA;

        return ndisc_option_parse(rt->packet, rt->current_option->offset, NULL, ret_size, ret);
}

#define DEFINE_GETTER(name, type, element, element_type)                \
        int sd_ndisc_router_##name##_get_##element(                     \
                        sd_ndisc_router *rt,                            \
                        element_type *ret) {                            \
                                                                        \
                int r;                                                  \
                                                                        \
                assert_return(rt, -EINVAL);                             \
                assert_return(ret, -EINVAL);                            \
                                                                        \
                r = sd_ndisc_router_option_is_type(rt, type);           \
                if (r < 0)                                              \
                        return r;                                       \
                if (r == 0)                                             \
                        return -EMEDIUMTYPE;                            \
                                                                        \
                *ret = rt->current_option->name.element;                \
                return 0;                                               \
        }

DEFINE_GETTER(prefix, SD_NDISC_OPTION_PREFIX_INFORMATION, flags, uint8_t);
DEFINE_GETTER(prefix, SD_NDISC_OPTION_PREFIX_INFORMATION, prefixlen, uint8_t);
DEFINE_GETTER(prefix, SD_NDISC_OPTION_PREFIX_INFORMATION, address, struct in6_addr);
DEFINE_GETTER(prefix, SD_NDISC_OPTION_PREFIX_INFORMATION, valid_lifetime, uint64_t);
DEFINE_GETTER(prefix, SD_NDISC_OPTION_PREFIX_INFORMATION, preferred_lifetime, uint64_t);

DEFINE_GETTER(route, SD_NDISC_OPTION_ROUTE_INFORMATION, preference, uint8_t);
DEFINE_GETTER(route, SD_NDISC_OPTION_ROUTE_INFORMATION, prefixlen, uint8_t);
DEFINE_GETTER(route, SD_NDISC_OPTION_ROUTE_INFORMATION, address, struct in6_addr);
DEFINE_GETTER(route, SD_NDISC_OPTION_ROUTE_INFORMATION, lifetime, uint64_t);

DEFINE_GETTER(rdnss, SD_NDISC_OPTION_RDNSS, lifetime, uint64_t);

int sd_ndisc_router_rdnss_get_addresses(sd_ndisc_router *rt, const struct in6_addr **ret) {
        int r;

        assert_return(rt, -EINVAL);
        assert_return(ret, -EINVAL);

        r = sd_ndisc_router_option_is_type(rt, SD_NDISC_OPTION_RDNSS);
        if (r < 0)
                return r;
        if (r == 0)
                return -EMEDIUMTYPE;

        *ret = rt->current_option->rdnss.addresses;
        return (int) rt->current_option->rdnss.n_addresses;
}

DEFINE_GETTER(dnssl, SD_NDISC_OPTION_DNSSL, domains, char**);
DEFINE_GETTER(dnssl, SD_NDISC_OPTION_DNSSL, lifetime, uint64_t);

DEFINE_GETTER(prefix64, SD_NDISC_OPTION_PREF64, prefixlen, uint8_t);
DEFINE_GETTER(prefix64, SD_NDISC_OPTION_PREF64, prefix, struct in6_addr);
DEFINE_GETTER(prefix64, SD_NDISC_OPTION_PREF64, lifetime, uint64_t);
Commit	Line	Data
db9ecf05	1	/* SPDX-License-Identifier: LGPL-2.1-or-later */
1e7a0e21	2	/***
810adae9	3	Copyright © 2014 Intel Corporation. All rights reserved.
1e7a0e21 LP	4	***/
	5
	6	#include <netinet/icmp6.h>
	7
	8	#include "sd-ndisc.h"
	9
	10	#include "alloc-util.h"
1e7a0e21	11	#include "ndisc-internal.h"
ca34b434	12	#include "ndisc-router-internal.h"
238ed432	13	#include "string-table.h"
1e7a0e21	14
c34cb1d6 YW	15	static sd_ndisc_router* ndisc_router_free(sd_ndisc_router *rt) {
	16	if (!rt)
	17	return NULL;
	18
	19	icmp6_packet_unref(rt->packet);
c0edd6b3	20	set_free(rt->options);
c34cb1d6 YW	21	return mfree(rt);
	22	}
	23
	24	DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_ndisc_router, sd_ndisc_router, ndisc_router_free);
1e7a0e21	25
c34cb1d6	26	sd_ndisc_router* ndisc_router_new(ICMP6Packet *packet) {
1e7a0e21 LP	27	sd_ndisc_router *rt;
1e7a0e21 LP	28
c34cb1d6	29	assert(packet);
4e88a46b	30
c34cb1d6	31	rt = new(sd_ndisc_router, 1);
1e7a0e21 LP	32	if (!rt)
	33	return NULL;
	34
c34cb1d6 YW	35	*rt = (sd_ndisc_router) {
	36	.n_ref = 1,
	37	.packet = icmp6_packet_ref(packet),
c0edd6b3	38	.iterator = ITERATOR_FIRST,
c34cb1d6	39	};
1e7a0e21 LP	40
	41	return rt;
	42	}
	43
95d3570b YW	44	int sd_ndisc_router_set_sender_address(sd_ndisc_router rt, const struct in6_addr addr) {
	45	assert_return(rt, -EINVAL);
	46
	47	return icmp6_packet_set_sender_address(rt->packet, addr);
	48	}
	49
9ca04752	50	int sd_ndisc_router_get_sender_address(sd_ndisc_router rt, struct in6_addr ret) {
1e7a0e21	51	assert_return(rt, -EINVAL);
1e7a0e21	52
c34cb1d6	53	return icmp6_packet_get_sender_address(rt->packet, ret);
1e7a0e21 LP	54	}
1e7a0e21 LP	55
17347053	56	int sd_ndisc_router_get_timestamp(sd_ndisc_router rt, clockid_t clock, uint64_t ret) {
1e7a0e21	57	assert_return(rt, -EINVAL);
1e7a0e21 LP	58	assert_return(ret, -EINVAL);
1e7a0e21 LP	59
c34cb1d6	60	return icmp6_packet_get_timestamp(rt->packet, clock, ret);
1e7a0e21 LP	61	}
1e7a0e21 LP	62
6197db53 YW	63	#define DEFINE_GET_TIMESTAMP(name) \
	64	int sd_ndisc_router_##name##_timestamp( \
	65	sd_ndisc_router *rt, \
	66	clockid_t clock, \
	67	uint64_t *ret) { \
	68	\
	69	usec_t s, t; \
	70	int r; \
	71	\
	72	assert_return(rt, -EINVAL); \
	73	assert_return(ret, -EINVAL); \
	74	\
	75	r = sd_ndisc_router_##name(rt, &s); \
	76	if (r < 0) \
	77	return r; \
	78	\
	79	r = sd_ndisc_router_get_timestamp(rt, clock, &t); \
	80	if (r < 0) \
	81	return r; \
	82	\
	83	*ret = time_span_to_stamp(s, t); \
	84	return 0; \
	85	}
	86
	87	DEFINE_GET_TIMESTAMP(get_lifetime);
	88	DEFINE_GET_TIMESTAMP(prefix_get_valid_lifetime);
	89	DEFINE_GET_TIMESTAMP(prefix_get_preferred_lifetime);
	90	DEFINE_GET_TIMESTAMP(route_get_lifetime);
	91	DEFINE_GET_TIMESTAMP(rdnss_get_lifetime);
	92	DEFINE_GET_TIMESTAMP(dnssl_get_lifetime);
	93	DEFINE_GET_TIMESTAMP(prefix64_get_lifetime);
	94
35388783	95	int ndisc_router_parse(sd_ndisc nd, sd_ndisc_router rt) {
c34cb1d6	96	const struct nd_router_advert *a;
c34cb1d6	97	int r;
1e7a0e21 LP	98
1e7a0e21 LP	99	assert(rt);
c34cb1d6	100	assert(rt->packet);
1e7a0e21	101
c34cb1d6	102	if (rt->packet->raw_size < sizeof(struct nd_router_advert))
35388783 YW	103	return log_ndisc_errno(nd, SYNTHETIC_ERRNO(EBADMSG),
35388783 YW	104	"Too small to be a router advertisement, ignoring.");
1e7a0e21	105
c34cb1d6 YW	106	a = (const struct nd_router_advert*) rt->packet->raw_packet;
	107	assert(a->nd_ra_type == ND_ROUTER_ADVERT);
	108	assert(a->nd_ra_code == 0);
1e7a0e21 LP	109
1e7a0e21 LP	110	rt->hop_limit = a->nd_ra_curhoplimit;
da890466	111	rt->flags = a->nd_ra_flags_reserved; /* the first 8 bits */
6197db53	112	rt->lifetime_usec = be16_sec_to_usec(a->nd_ra_router_lifetime, /* max_as_infinity = */ false);
a68f007a	113	rt->reachable_time_usec = be32_msec_to_usec(a->nd_ra_reachable, /* mas_as_infinity = */ false);
d4c8de21	114	rt->retransmission_time_usec = be32_msec_to_usec(a->nd_ra_retransmit, /* max_as_infinity = */ false);
1e7a0e21	115
c0edd6b3 YW	116	/* RFC 4191 section 2.2
	117	* Prf (Default Router Preference)
	118	* 2-bit signed integer. Indicates whether to prefer this router over other default routers. If the
	119	* Router Lifetime is zero, the preference value MUST be set to (00) by the sender and MUST be
	120	* ignored by the receiver. If the Reserved (10) value is received, the receiver MUST treat the value
	121	* as if it were (00). */
1e7a0e21	122	rt->preference = (rt->flags >> 3) & 3;
c0edd6b3	123	if (rt->preference == SD_NDISC_PREFERENCE_RESERVED)
1e7a0e21 LP	124	rt->preference = SD_NDISC_PREFERENCE_MEDIUM;
1e7a0e21 LP	125
c0edd6b3 YW	126	r = ndisc_parse_options(rt->packet, &rt->options);
	127	if (r < 0)
	128	return log_ndisc_errno(nd, r, "Failed to parse NDisc options in router advertisement message, ignoring: %m");
1e7a0e21	129
1e7a0e21 LP	130	return 0;
	131	}
	132
17347053	133	int sd_ndisc_router_get_hop_limit(sd_ndisc_router rt, uint8_t ret) {
1e7a0e21 LP	134	assert_return(rt, -EINVAL);
	135	assert_return(ret, -EINVAL);
	136
	137	*ret = rt->hop_limit;
	138	return 0;
	139	}
	140
a68f007a YW	141	int sd_ndisc_router_get_reachable_time(sd_ndisc_router rt, uint64_t ret) {
	142	assert_return(rt, -EINVAL);
	143	assert_return(ret, -EINVAL);
	144
	145	*ret = rt->reachable_time_usec;
	146	return 0;
	147	}
	148
d4c8de21 MM	149	int sd_ndisc_router_get_retransmission_time(sd_ndisc_router rt, uint64_t ret) {
	150	assert_return(rt, -EINVAL);
	151	assert_return(ret, -EINVAL);
	152
	153	*ret = rt->retransmission_time_usec;
	154	return 0;
	155	}
	156
3231f624	157	int sd_ndisc_router_get_flags(sd_ndisc_router rt, uint64_t ret) {
1e7a0e21	158	assert_return(rt, -EINVAL);
3231f624	159	assert_return(ret, -EINVAL);
1e7a0e21	160
697c3693	161	sd_ndisc_option *p = ndisc_option_get_by_type(rt->options, SD_NDISC_OPTION_FLAGS_EXTENSION);
c0edd6b3 YW	162
c0edd6b3 YW	163	*ret = rt->flags \| (p ? p->extended_flags : 0);
1e7a0e21 LP	164	return 0;
	165	}
	166
238ed432 YW	167	int ndisc_router_flags_to_string(uint64_t flags, char **ret) {
	168	_cleanup_free_ char *s = NULL;
	169
	170	assert(ret);
	171
	172	if (FLAGS_SET(flags, ND_RA_FLAG_MANAGED) &&
	173	!strextend_with_separator(&s, ", ", "managed"))
	174	return -ENOMEM;
	175
	176	if (FLAGS_SET(flags, ND_RA_FLAG_OTHER) &&
	177	!strextend_with_separator(&s, ", ", "other"))
	178	return -ENOMEM;
	179
	180	if (FLAGS_SET(flags, ND_RA_FLAG_HOME_AGENT) &&
	181	!strextend_with_separator(&s, ", ", "home-agent"))
	182	return -ENOMEM;
	183
	184	*ret = TAKE_PTR(s);
	185	return 0;
	186	}
	187
6197db53	188	int sd_ndisc_router_get_lifetime(sd_ndisc_router rt, uint64_t ret) {
1e7a0e21	189	assert_return(rt, -EINVAL);
1e7a0e21	190
828b5dbf YW	191	if (ret)
	192	*ret = rt->lifetime_usec;
	193
	194	return rt->lifetime_usec > 0; /* Indicate if the router is still valid or not. */
1e7a0e21 LP	195	}
1e7a0e21 LP	196
9ca04752	197	int sd_ndisc_router_get_preference(sd_ndisc_router rt, uint8_t ret) {
1e7a0e21 LP	198	assert_return(rt, -EINVAL);
	199	assert_return(ret, -EINVAL);
	200
	201	*ret = rt->preference;
	202	return 0;
	203	}
	204
238ed432 YW	205	static const char* const ndisc_router_preference_table[] = {
	206	[SD_NDISC_PREFERENCE_LOW] = "low",
	207	[SD_NDISC_PREFERENCE_MEDIUM] = "medium",
	208	[SD_NDISC_PREFERENCE_HIGH] = "high",
	209	};
	210
	211	DEFINE_STRING_TABLE_LOOKUP_TO_STRING(ndisc_router_preference, int);
	212
b43c2221 YW	213	int sd_ndisc_router_get_sender_mac(sd_ndisc_router rt, struct ether_addr ret) {
	214	assert_return(rt, -EINVAL);
	215
	216	return ndisc_option_get_mac(rt->options, SD_NDISC_OPTION_SOURCE_LL_ADDRESS, ret);
	217	}
	218
17347053	219	int sd_ndisc_router_get_mtu(sd_ndisc_router rt, uint32_t ret) {
1e7a0e21 LP	220	assert_return(rt, -EINVAL);
	221	assert_return(ret, -EINVAL);
	222
697c3693	223	sd_ndisc_option *p = ndisc_option_get_by_type(rt->options, SD_NDISC_OPTION_MTU);
c0edd6b3	224	if (!p)
1e7a0e21 LP	225	return -ENODATA;
1e7a0e21 LP	226
c0edd6b3	227	*ret = p->mtu;
1e7a0e21 LP	228	return 0;
	229	}
	230
9ca04752	231	int sd_ndisc_router_get_captive_portal(sd_ndisc_router rt, const char *ret) {
1e7a0e21 LP	232	assert_return(rt, -EINVAL);
	233	assert_return(ret, -EINVAL);
	234
697c3693	235	sd_ndisc_option *p = ndisc_option_get_by_type(rt->options, SD_NDISC_OPTION_CAPTIVE_PORTAL);
c0edd6b3 YW	236	if (!p)
c0edd6b3 YW	237	return -ENODATA;
1e7a0e21	238
c0edd6b3	239	*ret = p->captive_portal;
1e7a0e21 LP	240	return 0;
	241	}
	242
c0edd6b3	243	int sd_ndisc_router_option_rewind(sd_ndisc_router *rt) {
1e7a0e21	244	assert_return(rt, -EINVAL);
9f702d00	245
c0edd6b3 YW	246	rt->iterator = ITERATOR_FIRST;
c0edd6b3 YW	247	return sd_ndisc_router_option_next(rt);
1e7a0e21 LP	248	}
1e7a0e21 LP	249
c0edd6b3	250	int sd_ndisc_router_option_next(sd_ndisc_router *rt) {
1e7a0e21	251	assert_return(rt, -EINVAL);
1e7a0e21	252
c0edd6b3	253	return set_iterate(rt->options, &rt->iterator, (void**) &rt->current_option);
1e7a0e21 LP	254	}
1e7a0e21 LP	255
c0edd6b3	256	int sd_ndisc_router_option_get_type(sd_ndisc_router rt, uint8_t ret) {
1e7a0e21 LP	257	assert_return(rt, -EINVAL);
	258	assert_return(ret, -EINVAL);
	259
c0edd6b3 YW	260	if (!rt->current_option)
c0edd6b3 YW	261	return -ENODATA;
1e7a0e21	262
c0edd6b3	263	*ret = rt->current_option->type;
1e7a0e21 LP	264	return 0;
	265	}
	266
c0edd6b3 YW	267	int sd_ndisc_router_option_is_type(sd_ndisc_router *rt, uint8_t type) {
c0edd6b3 YW	268	uint8_t t;
1e7a0e21 LP	269	int r;
	270
	271	assert_return(rt, -EINVAL);
1e7a0e21	272
c0edd6b3	273	r = sd_ndisc_router_option_get_type(rt, &t);
1e7a0e21 LP	274	if (r < 0)
	275	return r;
	276
c0edd6b3	277	return t == type;
1e7a0e21 LP	278	}
1e7a0e21 LP	279
9ca04752	280	int sd_ndisc_router_option_get_raw(sd_ndisc_router rt, const uint8_t ret, size_t ret_size) {
1e7a0e21	281	assert_return(rt, -EINVAL);
1e7a0e21	282
c0edd6b3 YW	283	if (!rt->current_option)
c0edd6b3 YW	284	return -ENODATA;
1e7a0e21	285
9ca04752	286	return ndisc_option_parse(rt->packet, rt->current_option->offset, NULL, ret_size, ret);
1e7a0e21 LP	287	}
1e7a0e21 LP	288
c0edd6b3 YW	289	#define DEFINE_GETTER(name, type, element, element_type) \
	290	int sd_ndisc_router_##name##_get_##element( \
	291	sd_ndisc_router *rt, \
	292	element_type *ret) { \
	293	\
	294	int r; \
	295	\
	296	assert_return(rt, -EINVAL); \
	297	assert_return(ret, -EINVAL); \
	298	\
	299	r = sd_ndisc_router_option_is_type(rt, type); \
	300	if (r < 0) \
	301	return r; \
	302	if (r == 0) \
	303	return -EMEDIUMTYPE; \
	304	\
	305	*ret = rt->current_option->name.element; \
	306	return 0; \
	307	}
1e7a0e21	308
c0edd6b3	309	DEFINE_GETTER(prefix, SD_NDISC_OPTION_PREFIX_INFORMATION, flags, uint8_t);
9ca04752	310	DEFINE_GETTER(prefix, SD_NDISC_OPTION_PREFIX_INFORMATION, prefixlen, uint8_t);
c0edd6b3 YW	311	DEFINE_GETTER(prefix, SD_NDISC_OPTION_PREFIX_INFORMATION, address, struct in6_addr);
	312	DEFINE_GETTER(prefix, SD_NDISC_OPTION_PREFIX_INFORMATION, valid_lifetime, uint64_t);
	313	DEFINE_GETTER(prefix, SD_NDISC_OPTION_PREFIX_INFORMATION, preferred_lifetime, uint64_t);
1e7a0e21	314
9ca04752 YW	315	DEFINE_GETTER(route, SD_NDISC_OPTION_ROUTE_INFORMATION, preference, uint8_t);
9ca04752 YW	316	DEFINE_GETTER(route, SD_NDISC_OPTION_ROUTE_INFORMATION, prefixlen, uint8_t);
c0edd6b3 YW	317	DEFINE_GETTER(route, SD_NDISC_OPTION_ROUTE_INFORMATION, address, struct in6_addr);
c0edd6b3 YW	318	DEFINE_GETTER(route, SD_NDISC_OPTION_ROUTE_INFORMATION, lifetime, uint64_t);
1e7a0e21	319
c0edd6b3	320	DEFINE_GETTER(rdnss, SD_NDISC_OPTION_RDNSS, lifetime, uint64_t);
1e7a0e21	321
c0edd6b3	322	int sd_ndisc_router_rdnss_get_addresses(sd_ndisc_router rt, const struct in6_addr *ret) {
1e7a0e21 LP	323	int r;
	324
	325	assert_return(rt, -EINVAL);
	326	assert_return(ret, -EINVAL);
	327
1e7a0e21 LP	328	r = sd_ndisc_router_option_is_type(rt, SD_NDISC_OPTION_RDNSS);
	329	if (r < 0)
	330	return r;
	331	if (r == 0)
	332	return -EMEDIUMTYPE;
	333
c0edd6b3 YW	334	*ret = rt->current_option->rdnss.addresses;
c0edd6b3 YW	335	return (int) rt->current_option->rdnss.n_addresses;
1e7a0e21 LP	336	}
1e7a0e21 LP	337
9ca04752	338	DEFINE_GETTER(dnssl, SD_NDISC_OPTION_DNSSL, domains, char**);
c0edd6b3	339	DEFINE_GETTER(dnssl, SD_NDISC_OPTION_DNSSL, lifetime, uint64_t);
1e7a0e21	340
9ca04752	341	DEFINE_GETTER(prefix64, SD_NDISC_OPTION_PREF64, prefixlen, uint8_t);
c0edd6b3 YW	342	DEFINE_GETTER(prefix64, SD_NDISC_OPTION_PREF64, prefix, struct in6_addr);
c0edd6b3 YW	343	DEFINE_GETTER(prefix64, SD_NDISC_OPTION_PREF64, lifetime, uint64_t);