[thirdparty/systemd.git] / src / libsystemd-network / sd-icmp6-nd.c

/***
  This file is part of systemd.

  Copyright (C) 2014 Intel Corporation. All rights reserved.

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <netinet/icmp6.h>
#include <netinet/ip6.h>
#include <string.h>
#include <stdbool.h>
#include <netinet/in.h>
#include <sys/ioctl.h>

#include "socket-util.h"
#include "refcnt.h"
#include "async.h"

#include "dhcp6-internal.h"
#include "sd-icmp6-nd.h"

#define ICMP6_ROUTER_SOLICITATION_INTERVAL      4 * USEC_PER_SEC
#define ICMP6_MAX_ROUTER_SOLICITATIONS          3

enum icmp6_nd_state {
        ICMP6_NEIGHBOR_DISCOVERY_IDLE           = 0,
        ICMP6_ROUTER_SOLICITATION_SENT          = 10,
        ICMP6_ROUTER_ADVERTISMENT_LISTEN        = 11,
};

#define IP6_MIN_MTU (unsigned)1280
#define ICMP6_ND_RECV_SIZE (IP6_MIN_MTU - sizeof(struct ip6_hdr))
#define ICMP6_OPT_LEN_UNITS 8

typedef struct ICMP6Prefix ICMP6Prefix;

struct ICMP6Prefix {
        RefCount n_ref;

        LIST_FIELDS(ICMP6Prefix, prefixes);

        uint8_t len;
        sd_event_source *timeout_valid;
        struct in6_addr addr;
};

struct sd_icmp6_nd {
        RefCount n_ref;

        enum icmp6_nd_state state;
        sd_event *event;
        int event_priority;
        int index;
        struct ether_addr mac_addr;
        uint32_t mtu;
        ICMP6Prefix *expired_prefix;
        LIST_HEAD(ICMP6Prefix, prefixes);
        int fd;
        sd_event_source *recv;
        sd_event_source *timeout;
        int nd_sent;
        sd_icmp6_nd_callback_t callback;
        void *userdata;
};

#define log_icmp6_nd(p, fmt, ...) log_internal(LOG_DEBUG, 0, __FILE__, __LINE__, __func__, "ICMPv6 CLIENT: " fmt, ##__VA_ARGS__)

static ICMP6Prefix *icmp6_prefix_unref(ICMP6Prefix *prefix) {
        if (prefix && REFCNT_DEC(prefix->n_ref) <= 0) {
                prefix->timeout_valid =
                        sd_event_source_unref(prefix->timeout_valid);

                free(prefix);
        }

        return NULL;
}

static int icmp6_prefix_new(ICMP6Prefix **ret) {
        _cleanup_free_ ICMP6Prefix *prefix = NULL;

        assert(ret);

        prefix = new0(ICMP6Prefix, 1);
        if (!prefix)
                return -ENOMEM;

        prefix->n_ref = REFCNT_INIT;
        LIST_INIT(prefixes, prefix);

        *ret = prefix;
        prefix = NULL;

        return 0;
}

static void icmp6_nd_notify(sd_icmp6_nd *nd, int event)
{
        if (nd->callback)
                nd->callback(nd, event, nd->userdata);
}

int sd_icmp6_nd_set_callback(sd_icmp6_nd *nd, sd_icmp6_nd_callback_t callback,
                             void *userdata) {
        assert(nd);

        nd->callback = callback;
        nd->userdata = userdata;

        return 0;
}

int sd_icmp6_nd_set_index(sd_icmp6_nd *nd, int interface_index) {
        assert(nd);
        assert(interface_index >= -1);

        nd->index = interface_index;

        return 0;
}

int sd_icmp6_nd_set_mac(sd_icmp6_nd *nd, const struct ether_addr *mac_addr) {
        assert(nd);

        if (mac_addr)
                memcpy(&nd->mac_addr, mac_addr, sizeof(nd->mac_addr));
        else
                zero(nd->mac_addr);

        return 0;

}

int sd_icmp6_nd_attach_event(sd_icmp6_nd *nd, sd_event *event, int priority) {
        int r;

        assert_return(nd, -EINVAL);
        assert_return(!nd->event, -EBUSY);

        if (event)
                nd->event = sd_event_ref(event);
        else {
                r = sd_event_default(&nd->event);
                if (r < 0)
                        return 0;
        }

        nd->event_priority = priority;

        return 0;
}

int sd_icmp6_nd_detach_event(sd_icmp6_nd *nd) {
        assert_return(nd, -EINVAL);

        nd->event = sd_event_unref(nd->event);

        return 0;
}

sd_event *sd_icmp6_nd_get_event(sd_icmp6_nd *nd) {
        assert(nd);

        return nd->event;
}

sd_icmp6_nd *sd_icmp6_nd_ref(sd_icmp6_nd *nd) {
        assert (nd);

        assert_se(REFCNT_INC(nd->n_ref) >= 2);

        return nd;
}

static int icmp6_nd_init(sd_icmp6_nd *nd) {
        assert(nd);

        nd->recv = sd_event_source_unref(nd->recv);
        nd->fd = asynchronous_close(nd->fd);
        nd->timeout = sd_event_source_unref(nd->timeout);

        return 0;
}

sd_icmp6_nd *sd_icmp6_nd_unref(sd_icmp6_nd *nd) {
        if (nd && REFCNT_DEC(nd->n_ref) == 0) {
                ICMP6Prefix *prefix, *p;

                icmp6_nd_init(nd);
                sd_icmp6_nd_detach_event(nd);

                LIST_FOREACH_SAFE(prefixes, prefix, p, nd->prefixes) {
                        LIST_REMOVE(prefixes, nd->prefixes, prefix);

                        prefix = icmp6_prefix_unref(prefix);
                }

                free(nd);
        }

        return NULL;
}

DEFINE_TRIVIAL_CLEANUP_FUNC(sd_icmp6_nd*, sd_icmp6_nd_unref);
#define _cleanup_sd_icmp6_nd_free_ _cleanup_(sd_icmp6_nd_unrefp)

int sd_icmp6_nd_new(sd_icmp6_nd **ret) {
        _cleanup_sd_icmp6_nd_free_ sd_icmp6_nd *nd = NULL;

        assert(ret);

        nd = new0(sd_icmp6_nd, 1);
        if (!nd)
                return -ENOMEM;

        nd->n_ref = REFCNT_INIT;

        nd->index = -1;
        nd->fd = -1;

        LIST_HEAD_INIT(nd->prefixes);

        *ret = nd;
        nd = NULL;

        return 0;
}

int sd_icmp6_ra_get_mtu(sd_icmp6_nd *nd, uint32_t *mtu) {
        assert_return(nd, -EINVAL);
        assert_return(mtu, -EINVAL);

        if (nd->mtu == 0)
                return -ENOMSG;

        *mtu = nd->mtu;

        return 0;
}

static int icmp6_ra_prefix_timeout(sd_event_source *s, uint64_t usec,
                                   void *userdata) {
        sd_icmp6_nd *nd = userdata;
        ICMP6Prefix *prefix, *p;

        assert(nd);

        LIST_FOREACH_SAFE(prefixes, prefix, p, nd->prefixes) {
                if (prefix->timeout_valid != s)
                        continue;

                log_icmp6_nd(nd, "Prefix expired "SD_ICMP6_ADDRESS_FORMAT_STR"/%d",
                             SD_ICMP6_ADDRESS_FORMAT_VAL(prefix->addr),
                             prefix->len);

                LIST_REMOVE(prefixes, nd->prefixes, prefix);

                nd->expired_prefix = prefix;
                icmp6_nd_notify(nd,
                                ICMP6_EVENT_ROUTER_ADVERTISMENT_PREFIX_EXPIRED);
                nd->expired_prefix = NULL;

                prefix = icmp6_prefix_unref(prefix);

                break;
        }

        return 0;
}

static int icmp6_ra_prefix_set_timeout(sd_icmp6_nd *nd,
                                       ICMP6Prefix *prefix,
                                       usec_t valid) {
        usec_t time_now;
        int r;

        assert_return(prefix, -EINVAL);

        r = sd_event_now(nd->event, clock_boottime_or_monotonic(), &time_now);
        if (r < 0)
                return r;

        prefix->timeout_valid = sd_event_source_unref(prefix->timeout_valid);

        r = sd_event_add_time(nd->event, &prefix->timeout_valid,
                        clock_boottime_or_monotonic(), time_now + valid,
                        USEC_PER_SEC, icmp6_ra_prefix_timeout, nd);
        if (r < 0)
                goto error;

        r = sd_event_source_set_priority(prefix->timeout_valid,
                                        nd->event_priority);
        if (r < 0)
                goto error;

        r = sd_event_source_set_description(prefix->timeout_valid,
                                        "icmp6-prefix-timeout");

error:
        if (r < 0)
                prefix->timeout_valid =
                        sd_event_source_unref(prefix->timeout_valid);

        return r;
}

static int icmp6_prefix_match(const struct in6_addr *prefix, uint8_t prefixlen,
                              const struct in6_addr *addr,
                              uint8_t addr_prefixlen) {
        uint8_t bytes, mask, len;

        assert_return(prefix, -EINVAL);
        assert_return(addr, -EINVAL);

        len = MIN(prefixlen, addr_prefixlen);

        bytes = len / 8;
        mask = 0xff << (8 - len % 8);

        if (memcmp(prefix, addr, bytes) != 0 ||
            (prefix->s6_addr[bytes] & mask) != (addr->s6_addr[bytes] & mask))
                return -EADDRNOTAVAIL;

        return 0;
}

static int icmp6_ra_prefix_match(ICMP6Prefix *head, const struct in6_addr *addr,
                                 uint8_t addr_len, ICMP6Prefix **result) {
        ICMP6Prefix *prefix;

        LIST_FOREACH(prefixes, prefix, head) {
                if (icmp6_prefix_match(&prefix->addr, prefix->len, addr,
                                       addr_len) >= 0) {
                        *result = prefix;
                        return 0;
                }
        }

        return -EADDRNOTAVAIL;
}

int sd_icmp6_prefix_match(struct in6_addr *prefix, uint8_t prefixlen,
                          struct in6_addr *addr) {
        return icmp6_prefix_match(prefix, prefixlen, addr,
                                  sizeof(addr->s6_addr) * 8);
}

int sd_icmp6_ra_get_prefixlen(sd_icmp6_nd *nd, const struct in6_addr *addr,
                              uint8_t *prefixlen) {
        int r;
        ICMP6Prefix *prefix;

        assert_return(nd, -EINVAL);
        assert_return(addr, -EINVAL);
        assert_return(prefixlen, -EINVAL);

        r = icmp6_ra_prefix_match(nd->prefixes, addr,
                                  sizeof(addr->s6_addr) * 8, &prefix);
        if (r < 0)
                return r;

        *prefixlen = prefix->len;

        return 0;
}

int sd_icmp6_ra_get_expired_prefix(sd_icmp6_nd *nd, struct in6_addr **addr,
                                uint8_t *prefixlen)
{
        assert_return(nd, -EINVAL);
        assert_return(addr, -EINVAL);
        assert_return(prefixlen, -EINVAL);

        if (!nd->expired_prefix)
                return -EADDRNOTAVAIL;

        *addr = &nd->expired_prefix->addr;
        *prefixlen = nd->expired_prefix->len;

        return 0;
}

static int icmp6_ra_prefix_update(sd_icmp6_nd *nd, ssize_t len,
                                  const struct nd_opt_prefix_info *prefix_opt) {
        int r;
        ICMP6Prefix *prefix;
        uint32_t lifetime;
        char time_string[FORMAT_TIMESPAN_MAX];

        assert_return(nd, -EINVAL);
        assert_return(prefix_opt, -EINVAL);

        if (len < prefix_opt->nd_opt_pi_len)
                return -ENOMSG;

        if (!(prefix_opt->nd_opt_pi_flags_reserved & ND_OPT_PI_FLAG_ONLINK))
                return 0;

        lifetime = be32toh(prefix_opt->nd_opt_pi_valid_time);

        r = icmp6_ra_prefix_match(nd->prefixes,
                                  &prefix_opt->nd_opt_pi_prefix,
                                  prefix_opt->nd_opt_pi_prefix_len, &prefix);

        if (r < 0 && r != -EADDRNOTAVAIL)
                return r;

        /* if router advertisment prefix valid timeout is zero, the timeout
           callback will be called immediately to clean up the prefix */

        if (r == -EADDRNOTAVAIL) {
                r = icmp6_prefix_new(&prefix);
                if (r < 0)
                        return r;

                prefix->len = prefix_opt->nd_opt_pi_prefix_len;

                memcpy(&prefix->addr, &prefix_opt->nd_opt_pi_prefix,
                        sizeof(prefix->addr));

                log_icmp6_nd(nd, "New prefix "SD_ICMP6_ADDRESS_FORMAT_STR"/%d lifetime %d expires in %s",
                             SD_ICMP6_ADDRESS_FORMAT_VAL(prefix->addr),
                             prefix->len, lifetime,
                             format_timespan(time_string, FORMAT_TIMESPAN_MAX,
                                             lifetime * USEC_PER_SEC, 0));

                LIST_PREPEND(prefixes, nd->prefixes, prefix);

        } else {
                if (prefix->len != prefix_opt->nd_opt_pi_prefix_len) {
                        uint8_t prefixlen;

                        prefixlen = MIN(prefix->len, prefix_opt->nd_opt_pi_prefix_len);

                        log_icmp6_nd(nd, "Prefix length mismatch %d/%d using %d",
                                     prefix->len,
                                     prefix_opt->nd_opt_pi_prefix_len,
                                     prefixlen);

                        prefix->len = prefixlen;
                }

                log_icmp6_nd(nd, "Update prefix "SD_ICMP6_ADDRESS_FORMAT_STR"/%d lifetime %d expires in %s",
                             SD_ICMP6_ADDRESS_FORMAT_VAL(prefix->addr),
                             prefix->len, lifetime,
                             format_timespan(time_string, FORMAT_TIMESPAN_MAX,
                                             lifetime * USEC_PER_SEC, 0));
        }

        r = icmp6_ra_prefix_set_timeout(nd, prefix, lifetime * USEC_PER_SEC);

        return r;
}

static int icmp6_ra_parse(sd_icmp6_nd *nd, struct nd_router_advert *ra,
                          ssize_t len) {
        void *opt;
        struct nd_opt_hdr *opt_hdr;

        assert_return(nd, -EINVAL);
        assert_return(ra, -EINVAL);

        len -= sizeof(*ra);
        if (len < ICMP6_OPT_LEN_UNITS) {
                log_icmp6_nd(nd, "Router Advertisement below minimum length");

                return -ENOMSG;
        }

        opt = ra + 1;
        opt_hdr = opt;

        while (len != 0 && len >= opt_hdr->nd_opt_len * ICMP6_OPT_LEN_UNITS) {
                struct nd_opt_mtu *opt_mtu;
                uint32_t mtu;
                struct nd_opt_prefix_info *opt_prefix;

                if (opt_hdr->nd_opt_len == 0)
                        return -ENOMSG;

                switch (opt_hdr->nd_opt_type) {
                case ND_OPT_MTU:
                        opt_mtu = opt;

                        mtu = be32toh(opt_mtu->nd_opt_mtu_mtu);

                        if (mtu != nd->mtu) {
                                nd->mtu = MAX(mtu, IP6_MIN_MTU);

                                log_icmp6_nd(nd, "Router Advertisement link MTU %d using %d",
                                             mtu, nd->mtu);
                        }

                        break;

                case ND_OPT_PREFIX_INFORMATION:
                        opt_prefix = opt;

                        icmp6_ra_prefix_update(nd, len, opt_prefix);

                        break;
                }

                len -= opt_hdr->nd_opt_len * ICMP6_OPT_LEN_UNITS;
                opt = (void *)((char *)opt +
                        opt_hdr->nd_opt_len * ICMP6_OPT_LEN_UNITS);
                opt_hdr = opt;
        }

        if (len > 0)
                log_icmp6_nd(nd, "Router Advertisement contains %zd bytes of trailing garbage", len);

        return 0;
}

static int icmp6_router_advertisment_recv(sd_event_source *s, int fd,
                                          uint32_t revents, void *userdata)
{
        sd_icmp6_nd *nd = userdata;
        int r, buflen = 0;
        ssize_t len;
        _cleanup_free_ struct nd_router_advert *ra = NULL;
        int event = ICMP6_EVENT_ROUTER_ADVERTISMENT_NONE;

        assert(s);
        assert(nd);
        assert(nd->event);

        r = ioctl(fd, FIONREAD, &buflen);
        if (r < 0 || buflen <= 0)
                buflen = ICMP6_ND_RECV_SIZE;

        ra = malloc(buflen);
        if (!ra)
                return -ENOMEM;

        len = read(fd, ra, buflen);
        if (len < 0) {
                log_icmp6_nd(nd, "Could not receive message from UDP socket: %m");
                return 0;
        }

        if (ra->nd_ra_type != ND_ROUTER_ADVERT)
                return 0;

        if (ra->nd_ra_code != 0)
                return 0;

        nd->timeout = sd_event_source_unref(nd->timeout);

        nd->state = ICMP6_ROUTER_ADVERTISMENT_LISTEN;

        if (ra->nd_ra_flags_reserved & ND_RA_FLAG_OTHER )
                event = ICMP6_EVENT_ROUTER_ADVERTISMENT_OTHER;

        if (ra->nd_ra_flags_reserved & ND_RA_FLAG_MANAGED)
                event = ICMP6_EVENT_ROUTER_ADVERTISMENT_MANAGED;

        log_icmp6_nd(nd, "Received Router Advertisement flags %s/%s",
                     ra->nd_ra_flags_reserved & ND_RA_FLAG_MANAGED? "MANAGED": "none",
                     ra->nd_ra_flags_reserved & ND_RA_FLAG_OTHER? "OTHER": "none");

        if (event != ICMP6_EVENT_ROUTER_ADVERTISMENT_NONE) {
                r = icmp6_ra_parse(nd, ra, len);
                if (r < 0) {
                        log_icmp6_nd(nd, "Could not parse Router Advertisement: %s",
                                     strerror(-r));
                        return 0;
                }
        }

        icmp6_nd_notify(nd, event);

        return 0;
}

static int icmp6_router_solicitation_timeout(sd_event_source *s, uint64_t usec,
                                             void *userdata)
{
        sd_icmp6_nd *nd = userdata;
        uint64_t time_now, next_timeout;
        struct ether_addr unset = { };
        struct ether_addr *addr = NULL;
        int r;

        assert(s);
        assert(nd);
        assert(nd->event);

        nd->timeout = sd_event_source_unref(nd->timeout);

        if (nd->nd_sent >= ICMP6_MAX_ROUTER_SOLICITATIONS) {
                icmp6_nd_notify(nd, ICMP6_EVENT_ROUTER_ADVERTISMENT_TIMEOUT);
                nd->state = ICMP6_ROUTER_ADVERTISMENT_LISTEN;
        } else {
                if (memcmp(&nd->mac_addr, &unset, sizeof(struct ether_addr)))
                        addr = &nd->mac_addr;

                r = dhcp_network_icmp6_send_router_solicitation(nd->fd, addr);
                if (r < 0)
                        log_icmp6_nd(nd, "Error sending Router Solicitation");
                else {
                        nd->state = ICMP6_ROUTER_SOLICITATION_SENT;
                        log_icmp6_nd(nd, "Sent Router Solicitation");
                }

                nd->nd_sent++;

                r = sd_event_now(nd->event, clock_boottime_or_monotonic(), &time_now);
                if (r < 0) {
                        icmp6_nd_notify(nd, r);
                        return 0;
                }

                next_timeout = time_now + ICMP6_ROUTER_SOLICITATION_INTERVAL;

                r = sd_event_add_time(nd->event, &nd->timeout, clock_boottime_or_monotonic(),
                                      next_timeout, 0,
                                      icmp6_router_solicitation_timeout, nd);
                if (r < 0) {
                        icmp6_nd_notify(nd, r);
                        return 0;
                }

                r = sd_event_source_set_priority(nd->timeout,
                                                 nd->event_priority);
                if (r < 0) {
                        icmp6_nd_notify(nd, r);
                        return 0;
                }

                r = sd_event_source_set_description(nd->timeout, "icmp6-timeout");
                if (r < 0) {
                        icmp6_nd_notify(nd, r);
                        return 0;
                }
        }

        return 0;
}

int sd_icmp6_nd_stop(sd_icmp6_nd *nd) {
        assert_return(nd, -EINVAL);
        assert_return(nd->event, -EINVAL);

        log_icmp6_nd(client, "Stop ICMPv6");

        icmp6_nd_init(nd);

        nd->state = ICMP6_NEIGHBOR_DISCOVERY_IDLE;

        return 0;
}

int sd_icmp6_router_solicitation_start(sd_icmp6_nd *nd) {
        int r;

        assert(nd);
        assert(nd->event);

        if (nd->state != ICMP6_NEIGHBOR_DISCOVERY_IDLE)
                return -EINVAL;

        if (nd->index < 1)
                return -EINVAL;

        r = dhcp_network_icmp6_bind_router_solicitation(nd->index);
        if (r < 0)
                return r;

        nd->fd = r;

        r = sd_event_add_io(nd->event, &nd->recv, nd->fd, EPOLLIN,
                            icmp6_router_advertisment_recv, nd);
        if (r < 0)
                goto error;

        r = sd_event_source_set_priority(nd->recv, nd->event_priority);
        if (r < 0)
                goto error;

        r = sd_event_source_set_description(nd->recv, "icmp6-receive-message");
        if (r < 0)
                goto error;

        r = sd_event_add_time(nd->event, &nd->timeout, clock_boottime_or_monotonic(),
                              0, 0, icmp6_router_solicitation_timeout, nd);
        if (r < 0)
                goto error;

        r = sd_event_source_set_priority(nd->timeout, nd->event_priority);
        if (r < 0)
                goto error;

        r = sd_event_source_set_description(nd->timeout, "icmp6-timeout");
error:
        if (r < 0)
                icmp6_nd_init(nd);
        else
                log_icmp6_nd(client, "Start Router Solicitation");

        return r;
}
Commit	Line	Data
e3169126 PF	1	/***
	2	This file is part of systemd.
	3
	4	Copyright (C) 2014 Intel Corporation. All rights reserved.
	5
	6	systemd is free software; you can redistribute it and/or modify it
	7	under the terms of the GNU Lesser General Public License as published by
	8	the Free Software Foundation; either version 2.1 of the License, or
	9	(at your option) any later version.
	10
	11	systemd is distributed in the hope that it will be useful, but
	12	WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	Lesser General Public License for more details.
	15
	16	You should have received a copy of the GNU Lesser General Public License
	17	along with systemd; If not, see <http://www.gnu.org/licenses/>.
	18	***/
	19
	20	#include <netinet/icmp6.h>
09667885	21	#include <netinet/ip6.h>
e3169126 PF	22	#include <string.h>
	23	#include <stdbool.h>
	24	#include <netinet/in.h>
09667885	25	#include <sys/ioctl.h>
e3169126 PF	26
	27	#include "socket-util.h"
	28	#include "refcnt.h"
	29	#include "async.h"
	30
	31	#include "dhcp6-internal.h"
	32	#include "sd-icmp6-nd.h"
	33
	34	#define ICMP6_ROUTER_SOLICITATION_INTERVAL 4 * USEC_PER_SEC
	35	#define ICMP6_MAX_ROUTER_SOLICITATIONS 3
	36
	37	enum icmp6_nd_state {
	38	ICMP6_NEIGHBOR_DISCOVERY_IDLE = 0,
	39	ICMP6_ROUTER_SOLICITATION_SENT = 10,
	40	ICMP6_ROUTER_ADVERTISMENT_LISTEN = 11,
	41	};
	42
09667885 PF	43	#define IP6_MIN_MTU (unsigned)1280
	44	#define ICMP6_ND_RECV_SIZE (IP6_MIN_MTU - sizeof(struct ip6_hdr))
	45	#define ICMP6_OPT_LEN_UNITS 8
	46
5624c480 PF	47	typedef struct ICMP6Prefix ICMP6Prefix;
	48
	49	struct ICMP6Prefix {
	50	RefCount n_ref;
	51
	52	LIST_FIELDS(ICMP6Prefix, prefixes);
	53
	54	uint8_t len;
	55	sd_event_source *timeout_valid;
	56	struct in6_addr addr;
	57	};
	58
e3169126 PF	59	struct sd_icmp6_nd {
	60	RefCount n_ref;
	61
	62	enum icmp6_nd_state state;
	63	sd_event *event;
	64	int event_priority;
	65	int index;
	66	struct ether_addr mac_addr;
5624c480	67	uint32_t mtu;
bd1957e9	68	ICMP6Prefix *expired_prefix;
5624c480	69	LIST_HEAD(ICMP6Prefix, prefixes);
e3169126 PF	70	int fd;
	71	sd_event_source *recv;
	72	sd_event_source *timeout;
	73	int nd_sent;
	74	sd_icmp6_nd_callback_t callback;
	75	void *userdata;
	76	};
	77
79008bdd	78	#define log_icmp6_nd(p, fmt, ...) log_internal(LOG_DEBUG, 0, __FILE__, __LINE__, __func__, "ICMPv6 CLIENT: " fmt, ##__VA_ARGS__)
e3169126	79
5624c480 PF	80	static ICMP6Prefix icmp6_prefix_unref(ICMP6Prefix prefix) {
	81	if (prefix && REFCNT_DEC(prefix->n_ref) <= 0) {
	82	prefix->timeout_valid =
	83	sd_event_source_unref(prefix->timeout_valid);
	84
	85	free(prefix);
	86	}
	87
	88	return NULL;
	89	}
	90
	91	static int icmp6_prefix_new(ICMP6Prefix **ret) {
	92	_cleanup_free_ ICMP6Prefix *prefix = NULL;
	93
	94	assert(ret);
	95
	96	prefix = new0(ICMP6Prefix, 1);
	97	if (!prefix)
	98	return -ENOMEM;
	99
	100	prefix->n_ref = REFCNT_INIT;
	101	LIST_INIT(prefixes, prefix);
	102
	103	*ret = prefix;
	104	prefix = NULL;
	105
	106	return 0;
	107	}
	108
e3169126 PF	109	static void icmp6_nd_notify(sd_icmp6_nd *nd, int event)
	110	{
	111	if (nd->callback)
	112	nd->callback(nd, event, nd->userdata);
	113	}
	114
	115	int sd_icmp6_nd_set_callback(sd_icmp6_nd *nd, sd_icmp6_nd_callback_t callback,
	116	void *userdata) {
	117	assert(nd);
	118
	119	nd->callback = callback;
	120	nd->userdata = userdata;
	121
	122	return 0;
	123	}
	124
	125	int sd_icmp6_nd_set_index(sd_icmp6_nd *nd, int interface_index) {
	126	assert(nd);
	127	assert(interface_index >= -1);
	128
	129	nd->index = interface_index;
	130
	131	return 0;
	132	}
	133
	134	int sd_icmp6_nd_set_mac(sd_icmp6_nd nd, const struct ether_addr mac_addr) {
	135	assert(nd);
	136
	137	if (mac_addr)
	138	memcpy(&nd->mac_addr, mac_addr, sizeof(nd->mac_addr));
	139	else
eccaf899	140	zero(nd->mac_addr);
e3169126 PF	141
	142	return 0;
	143
	144	}
	145
	146	int sd_icmp6_nd_attach_event(sd_icmp6_nd nd, sd_event event, int priority) {
	147	int r;
	148
	149	assert_return(nd, -EINVAL);
	150	assert_return(!nd->event, -EBUSY);
	151
	152	if (event)
	153	nd->event = sd_event_ref(event);
	154	else {
	155	r = sd_event_default(&nd->event);
	156	if (r < 0)
	157	return 0;
	158	}
	159
	160	nd->event_priority = priority;
	161
	162	return 0;
	163	}
	164
	165	int sd_icmp6_nd_detach_event(sd_icmp6_nd *nd) {
	166	assert_return(nd, -EINVAL);
	167
	168	nd->event = sd_event_unref(nd->event);
	169
	170	return 0;
	171	}
	172
	173	sd_event sd_icmp6_nd_get_event(sd_icmp6_nd nd) {
	174	assert(nd);
	175
	176	return nd->event;
	177	}
	178
	179	sd_icmp6_nd sd_icmp6_nd_ref(sd_icmp6_nd nd) {
	180	assert (nd);
	181
	182	assert_se(REFCNT_INC(nd->n_ref) >= 2);
	183
	184	return nd;
	185	}
	186
	187	static int icmp6_nd_init(sd_icmp6_nd *nd) {
	188	assert(nd);
	189
	190	nd->recv = sd_event_source_unref(nd->recv);
	191	nd->fd = asynchronous_close(nd->fd);
	192	nd->timeout = sd_event_source_unref(nd->timeout);
	193
	194	return 0;
	195	}
	196
	197	sd_icmp6_nd sd_icmp6_nd_unref(sd_icmp6_nd nd) {
f0c4b1c3	198	if (nd && REFCNT_DEC(nd->n_ref) == 0) {
5624c480	199	ICMP6Prefix prefix, p;
e3169126 PF	200
	201	icmp6_nd_init(nd);
	202	sd_icmp6_nd_detach_event(nd);
	203
5624c480 PF	204	LIST_FOREACH_SAFE(prefixes, prefix, p, nd->prefixes) {
	205	LIST_REMOVE(prefixes, nd->prefixes, prefix);
	206
	207	prefix = icmp6_prefix_unref(prefix);
	208	}
	209
e3169126 PF	210	free(nd);
	211	}
	212
	213	return NULL;
	214	}
	215
	216	DEFINE_TRIVIAL_CLEANUP_FUNC(sd_icmp6_nd*, sd_icmp6_nd_unref);
	217	#define _cleanup_sd_icmp6_nd_free_ _cleanup_(sd_icmp6_nd_unrefp)
	218
	219	int sd_icmp6_nd_new(sd_icmp6_nd **ret) {
	220	_cleanup_sd_icmp6_nd_free_ sd_icmp6_nd *nd = NULL;
	221
	222	assert(ret);
	223
	224	nd = new0(sd_icmp6_nd, 1);
	225	if (!nd)
	226	return -ENOMEM;
	227
	228	nd->n_ref = REFCNT_INIT;
	229
	230	nd->index = -1;
03de7ed9	231	nd->fd = -1;
e3169126	232
5624c480 PF	233	LIST_HEAD_INIT(nd->prefixes);
5624c480 PF	234
e3169126 PF	235	*ret = nd;
	236	nd = NULL;
	237
	238	return 0;
	239	}
	240
d14b5bc6 PF	241	int sd_icmp6_ra_get_mtu(sd_icmp6_nd nd, uint32_t mtu) {
	242	assert_return(nd, -EINVAL);
	243	assert_return(mtu, -EINVAL);
	244
	245	if (nd->mtu == 0)
	246	return -ENOMSG;
	247
	248	*mtu = nd->mtu;
	249
	250	return 0;
	251	}
	252
d77bde34 PF	253	static int icmp6_ra_prefix_timeout(sd_event_source *s, uint64_t usec,
	254	void *userdata) {
	255	sd_icmp6_nd *nd = userdata;
	256	ICMP6Prefix prefix, p;
	257
	258	assert(nd);
	259
	260	LIST_FOREACH_SAFE(prefixes, prefix, p, nd->prefixes) {
	261	if (prefix->timeout_valid != s)
	262	continue;
	263
	264	log_icmp6_nd(nd, "Prefix expired "SD_ICMP6_ADDRESS_FORMAT_STR"/%d",
	265	SD_ICMP6_ADDRESS_FORMAT_VAL(prefix->addr),
	266	prefix->len);
	267
	268	LIST_REMOVE(prefixes, nd->prefixes, prefix);
	269
bd1957e9	270	nd->expired_prefix = prefix;
d77bde34 PF	271	icmp6_nd_notify(nd,
d77bde34 PF	272	ICMP6_EVENT_ROUTER_ADVERTISMENT_PREFIX_EXPIRED);
bd1957e9 PF	273	nd->expired_prefix = NULL;
bd1957e9 PF	274
d77bde34 PF	275	prefix = icmp6_prefix_unref(prefix);
	276
	277	break;
	278	}
	279
	280	return 0;
	281	}
	282
	283	static int icmp6_ra_prefix_set_timeout(sd_icmp6_nd *nd,
	284	ICMP6Prefix *prefix,
	285	usec_t valid) {
	286	usec_t time_now;
	287	int r;
	288
	289	assert_return(prefix, -EINVAL);
	290
	291	r = sd_event_now(nd->event, clock_boottime_or_monotonic(), &time_now);
	292	if (r < 0)
	293	return r;
	294
	295	prefix->timeout_valid = sd_event_source_unref(prefix->timeout_valid);
	296
	297	r = sd_event_add_time(nd->event, &prefix->timeout_valid,
	298	clock_boottime_or_monotonic(), time_now + valid,
	299	USEC_PER_SEC, icmp6_ra_prefix_timeout, nd);
	300	if (r < 0)
	301	goto error;
	302
	303	r = sd_event_source_set_priority(prefix->timeout_valid,
	304	nd->event_priority);
	305	if (r < 0)
	306	goto error;
	307
	308	r = sd_event_source_set_description(prefix->timeout_valid,
	309	"icmp6-prefix-timeout");
	310
	311	error:
	312	if (r < 0)
	313	prefix->timeout_valid =
	314	sd_event_source_unref(prefix->timeout_valid);
	315
	316	return r;
	317	}
	318
	319	static int icmp6_prefix_match(const struct in6_addr *prefix, uint8_t prefixlen,
	320	const struct in6_addr *addr,
	321	uint8_t addr_prefixlen) {
	322	uint8_t bytes, mask, len;
	323
	324	assert_return(prefix, -EINVAL);
	325	assert_return(addr, -EINVAL);
	326
	327	len = MIN(prefixlen, addr_prefixlen);
	328
	329	bytes = len / 8;
	330	mask = 0xff << (8 - len % 8);
	331
	332	if (memcmp(prefix, addr, bytes) != 0 \|\|
	333	(prefix->s6_addr[bytes] & mask) != (addr->s6_addr[bytes] & mask))
	334	return -EADDRNOTAVAIL;
	335
	336	return 0;
	337	}
	338
339	static int icmp6_ra_prefix_match(ICMP6Prefix head, const struct in6_addr addr,
340	uint8_t addr_len, ICMP6Prefix **result) {
341	ICMP6Prefix *prefix;
342
343	LIST_FOREACH(prefixes, prefix, head) {
344	if (icmp6_prefix_match(&prefix->addr, prefix->len, addr,
345	addr_len) >= 0) {
346	*result = prefix;
347	return 0;
348	}
349	}
350
351	return -EADDRNOTAVAIL;
352	}
353
354	int sd_icmp6_prefix_match(struct in6_addr *prefix, uint8_t prefixlen,
355	struct in6_addr *addr) {
356	return icmp6_prefix_match(prefix, prefixlen, addr,
357	sizeof(addr->s6_addr) * 8);
358	}
359
360	int sd_icmp6_ra_get_prefixlen(sd_icmp6_nd nd, const struct in6_addr addr,
361	uint8_t *prefixlen) {
362	int r;
363	ICMP6Prefix *prefix;
364
365	assert_return(nd, -EINVAL);
366	assert_return(addr, -EINVAL);
367	assert_return(prefixlen, -EINVAL);
368
369	r = icmp6_ra_prefix_match(nd->prefixes, addr,
370	sizeof(addr->s6_addr) * 8, &prefix);
371	if (r < 0)
372	return r;
373
374	*prefixlen = prefix->len;
375
376	return 0;
377	}
378
bd1957e9 PF	379	int sd_icmp6_ra_get_expired_prefix(sd_icmp6_nd nd, struct in6_addr *addr,
	380	uint8_t *prefixlen)
	381	{
	382	assert_return(nd, -EINVAL);
	383	assert_return(addr, -EINVAL);
	384	assert_return(prefixlen, -EINVAL);
	385
	386	if (!nd->expired_prefix)
	387	return -EADDRNOTAVAIL;
	388
	389	*addr = &nd->expired_prefix->addr;
	390	*prefixlen = nd->expired_prefix->len;
	391
	392	return 0;
	393	}
	394
d77bde34 PF	395	static int icmp6_ra_prefix_update(sd_icmp6_nd *nd, ssize_t len,
	396	const struct nd_opt_prefix_info *prefix_opt) {
	397	int r;
	398	ICMP6Prefix *prefix;
	399	uint32_t lifetime;
	400	char time_string[FORMAT_TIMESPAN_MAX];
	401
	402	assert_return(nd, -EINVAL);
	403	assert_return(prefix_opt, -EINVAL);
	404
	405	if (len < prefix_opt->nd_opt_pi_len)
	406	return -ENOMSG;
	407
	408	if (!(prefix_opt->nd_opt_pi_flags_reserved & ND_OPT_PI_FLAG_ONLINK))
	409	return 0;
	410
	411	lifetime = be32toh(prefix_opt->nd_opt_pi_valid_time);
	412
	413	r = icmp6_ra_prefix_match(nd->prefixes,
	414	&prefix_opt->nd_opt_pi_prefix,
	415	prefix_opt->nd_opt_pi_prefix_len, &prefix);
	416
	417	if (r < 0 && r != -EADDRNOTAVAIL)
	418	return r;
	419
	420	/* if router advertisment prefix valid timeout is zero, the timeout
	421	callback will be called immediately to clean up the prefix */
	422
	423	if (r == -EADDRNOTAVAIL) {
	424	r = icmp6_prefix_new(&prefix);
	425	if (r < 0)
	426	return r;
	427
	428	prefix->len = prefix_opt->nd_opt_pi_prefix_len;
	429
	430	memcpy(&prefix->addr, &prefix_opt->nd_opt_pi_prefix,
	431	sizeof(prefix->addr));
	432
	433	log_icmp6_nd(nd, "New prefix "SD_ICMP6_ADDRESS_FORMAT_STR"/%d lifetime %d expires in %s",
	434	SD_ICMP6_ADDRESS_FORMAT_VAL(prefix->addr),
	435	prefix->len, lifetime,
	436	format_timespan(time_string, FORMAT_TIMESPAN_MAX,
	437	lifetime * USEC_PER_SEC, 0));
	438
	439	LIST_PREPEND(prefixes, nd->prefixes, prefix);
	440
	441	} else {
	442	if (prefix->len != prefix_opt->nd_opt_pi_prefix_len) {
	443	uint8_t prefixlen;
	444
	445	prefixlen = MIN(prefix->len, prefix_opt->nd_opt_pi_prefix_len);
	446
	447	log_icmp6_nd(nd, "Prefix length mismatch %d/%d using %d",
	448	prefix->len,
	449	prefix_opt->nd_opt_pi_prefix_len,
	450	prefixlen);
	451
	452	prefix->len = prefixlen;
	453	}
	454
	455	log_icmp6_nd(nd, "Update prefix "SD_ICMP6_ADDRESS_FORMAT_STR"/%d lifetime %d expires in %s",
	456	SD_ICMP6_ADDRESS_FORMAT_VAL(prefix->addr),
	457	prefix->len, lifetime,
	458	format_timespan(time_string, FORMAT_TIMESPAN_MAX,
459	lifetime * USEC_PER_SEC, 0));
460	}
461
462	r = icmp6_ra_prefix_set_timeout(nd, prefix, lifetime * USEC_PER_SEC);
463
464	return r;
465	}
466
09667885 PF	467	static int icmp6_ra_parse(sd_icmp6_nd nd, struct nd_router_advert ra,
	468	ssize_t len) {
	469	void *opt;
	470	struct nd_opt_hdr *opt_hdr;
	471
	472	assert_return(nd, -EINVAL);
	473	assert_return(ra, -EINVAL);
	474
	475	len -= sizeof(*ra);
	476	if (len < ICMP6_OPT_LEN_UNITS) {
	477	log_icmp6_nd(nd, "Router Advertisement below minimum length");
	478
	479	return -ENOMSG;
	480	}
	481
	482	opt = ra + 1;
	483	opt_hdr = opt;
	484
	485	while (len != 0 && len >= opt_hdr->nd_opt_len * ICMP6_OPT_LEN_UNITS) {
d14b5bc6 PF	486	struct nd_opt_mtu *opt_mtu;
d14b5bc6 PF	487	uint32_t mtu;
d77bde34	488	struct nd_opt_prefix_info *opt_prefix;
09667885 PF	489
	490	if (opt_hdr->nd_opt_len == 0)
	491	return -ENOMSG;
	492
	493	switch (opt_hdr->nd_opt_type) {
d14b5bc6 PF	494	case ND_OPT_MTU:
	495	opt_mtu = opt;
	496
	497	mtu = be32toh(opt_mtu->nd_opt_mtu_mtu);
	498
	499	if (mtu != nd->mtu) {
	500	nd->mtu = MAX(mtu, IP6_MIN_MTU);
	501
	502	log_icmp6_nd(nd, "Router Advertisement link MTU %d using %d",
	503	mtu, nd->mtu);
	504	}
	505
	506	break;
09667885	507
d77bde34 PF	508	case ND_OPT_PREFIX_INFORMATION:
	509	opt_prefix = opt;
	510
	511	icmp6_ra_prefix_update(nd, len, opt_prefix);
	512
	513	break;
09667885 PF	514	}
	515
	516	len -= opt_hdr->nd_opt_len * ICMP6_OPT_LEN_UNITS;
	517	opt = (void )((char )opt +
	518	opt_hdr->nd_opt_len * ICMP6_OPT_LEN_UNITS);
	519	opt_hdr = opt;
	520	}
	521
	522	if (len > 0)
	523	log_icmp6_nd(nd, "Router Advertisement contains %zd bytes of trailing garbage", len);
	524
	525	return 0;
	526	}
	527
e3169126 PF	528	static int icmp6_router_advertisment_recv(sd_event_source *s, int fd,
	529	uint32_t revents, void *userdata)
	530	{
	531	sd_icmp6_nd *nd = userdata;
09667885	532	int r, buflen = 0;
e3169126	533	ssize_t len;
09667885	534	_cleanup_free_ struct nd_router_advert *ra = NULL;
e3169126 PF	535	int event = ICMP6_EVENT_ROUTER_ADVERTISMENT_NONE;
	536
	537	assert(s);
	538	assert(nd);
	539	assert(nd->event);
	540
09667885 PF	541	r = ioctl(fd, FIONREAD, &buflen);
	542	if (r < 0 \|\| buflen <= 0)
	543	buflen = ICMP6_ND_RECV_SIZE;
	544
	545	ra = malloc(buflen);
	546	if (!ra)
	547	return -ENOMEM;
	548
	549	len = read(fd, ra, buflen);
	550	if (len < 0) {
	551	log_icmp6_nd(nd, "Could not receive message from UDP socket: %m");
e3169126	552	return 0;
09667885	553	}
e3169126	554
09667885	555	if (ra->nd_ra_type != ND_ROUTER_ADVERT)
e3169126 PF	556	return 0;
e3169126 PF	557
09667885	558	if (ra->nd_ra_code != 0)
e3169126 PF	559	return 0;
	560
	561	nd->timeout = sd_event_source_unref(nd->timeout);
	562
	563	nd->state = ICMP6_ROUTER_ADVERTISMENT_LISTEN;
	564
09667885	565	if (ra->nd_ra_flags_reserved & ND_RA_FLAG_OTHER )
e3169126 PF	566	event = ICMP6_EVENT_ROUTER_ADVERTISMENT_OTHER;
e3169126 PF	567
09667885	568	if (ra->nd_ra_flags_reserved & ND_RA_FLAG_MANAGED)
e3169126 PF	569	event = ICMP6_EVENT_ROUTER_ADVERTISMENT_MANAGED;
e3169126 PF	570
06b643e7	571	log_icmp6_nd(nd, "Received Router Advertisement flags %s/%s",
09667885 PF	572	ra->nd_ra_flags_reserved & ND_RA_FLAG_MANAGED? "MANAGED": "none",
	573	ra->nd_ra_flags_reserved & ND_RA_FLAG_OTHER? "OTHER": "none");
	574
	575	if (event != ICMP6_EVENT_ROUTER_ADVERTISMENT_NONE) {
	576	r = icmp6_ra_parse(nd, ra, len);
	577	if (r < 0) {
	578	log_icmp6_nd(nd, "Could not parse Router Advertisement: %s",
	579	strerror(-r));
	580	return 0;
	581	}
	582	}
e3169126 PF	583
	584	icmp6_nd_notify(nd, event);
	585
	586	return 0;
	587	}
	588
	589	static int icmp6_router_solicitation_timeout(sd_event_source *s, uint64_t usec,
	590	void *userdata)
	591	{
	592	sd_icmp6_nd *nd = userdata;
	593	uint64_t time_now, next_timeout;
	594	struct ether_addr unset = { };
	595	struct ether_addr *addr = NULL;
	596	int r;
	597
	598	assert(s);
	599	assert(nd);
	600	assert(nd->event);
	601
	602	nd->timeout = sd_event_source_unref(nd->timeout);
	603
	604	if (nd->nd_sent >= ICMP6_MAX_ROUTER_SOLICITATIONS) {
	605	icmp6_nd_notify(nd, ICMP6_EVENT_ROUTER_ADVERTISMENT_TIMEOUT);
	606	nd->state = ICMP6_ROUTER_ADVERTISMENT_LISTEN;
	607	} else {
	608	if (memcmp(&nd->mac_addr, &unset, sizeof(struct ether_addr)))
	609	addr = &nd->mac_addr;
	610
	611	r = dhcp_network_icmp6_send_router_solicitation(nd->fd, addr);
	612	if (r < 0)
	613	log_icmp6_nd(nd, "Error sending Router Solicitation");
	614	else {
	615	nd->state = ICMP6_ROUTER_SOLICITATION_SENT;
	616	log_icmp6_nd(nd, "Sent Router Solicitation");
	617	}
	618
	619	nd->nd_sent++;
	620
fa94c34b	621	r = sd_event_now(nd->event, clock_boottime_or_monotonic(), &time_now);
e3169126 PF	622	if (r < 0) {
	623	icmp6_nd_notify(nd, r);
	624	return 0;
	625	}
	626
	627	next_timeout = time_now + ICMP6_ROUTER_SOLICITATION_INTERVAL;
	628
fa94c34b	629	r = sd_event_add_time(nd->event, &nd->timeout, clock_boottime_or_monotonic(),
e3169126 PF	630	next_timeout, 0,
	631	icmp6_router_solicitation_timeout, nd);
	632	if (r < 0) {
	633	icmp6_nd_notify(nd, r);
	634	return 0;
	635	}
	636
	637	r = sd_event_source_set_priority(nd->timeout,
	638	nd->event_priority);
	639	if (r < 0) {
	640	icmp6_nd_notify(nd, r);
	641	return 0;
	642	}
9021bb9f	643
356779df	644	r = sd_event_source_set_description(nd->timeout, "icmp6-timeout");
9021bb9f TG	645	if (r < 0) {
	646	icmp6_nd_notify(nd, r);
	647	return 0;
	648	}
e3169126 PF	649	}
	650
	651	return 0;
	652	}
	653
836cf090 PF	654	int sd_icmp6_nd_stop(sd_icmp6_nd *nd) {
	655	assert_return(nd, -EINVAL);
	656	assert_return(nd->event, -EINVAL);
	657
	658	log_icmp6_nd(client, "Stop ICMPv6");
	659
	660	icmp6_nd_init(nd);
	661
	662	nd->state = ICMP6_NEIGHBOR_DISCOVERY_IDLE;
	663
	664	return 0;
	665	}
	666
e3169126 PF	667	int sd_icmp6_router_solicitation_start(sd_icmp6_nd *nd) {
	668	int r;
	669
	670	assert(nd);
	671	assert(nd->event);
	672
	673	if (nd->state != ICMP6_NEIGHBOR_DISCOVERY_IDLE)
	674	return -EINVAL;
	675
	676	if (nd->index < 1)
	677	return -EINVAL;
	678
	679	r = dhcp_network_icmp6_bind_router_solicitation(nd->index);
	680	if (r < 0)
	681	return r;
	682
	683	nd->fd = r;
	684
	685	r = sd_event_add_io(nd->event, &nd->recv, nd->fd, EPOLLIN,
	686	icmp6_router_advertisment_recv, nd);
	687	if (r < 0)
	688	goto error;
	689
	690	r = sd_event_source_set_priority(nd->recv, nd->event_priority);
	691	if (r < 0)
	692	goto error;
	693
356779df	694	r = sd_event_source_set_description(nd->recv, "icmp6-receive-message");
9021bb9f TG	695	if (r < 0)
	696	goto error;
	697
fa94c34b	698	r = sd_event_add_time(nd->event, &nd->timeout, clock_boottime_or_monotonic(),
e3169126 PF	699	0, 0, icmp6_router_solicitation_timeout, nd);
	700	if (r < 0)
	701	goto error;
	702
	703	r = sd_event_source_set_priority(nd->timeout, nd->event_priority);
9021bb9f TG	704	if (r < 0)
9021bb9f TG	705	goto error;
e3169126	706
356779df	707	r = sd_event_source_set_description(nd->timeout, "icmp6-timeout");
e3169126 PF	708	error:
	709	if (r < 0)
	710	icmp6_nd_init(nd);
	711	else
	712	log_icmp6_nd(client, "Start Router Solicitation");
	713
	714	return r;
	715	}