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

/* SPDX-License-Identifier: LGPL-2.1+ */

#include <endian.h>
#include <inttypes.h>
#include <string.h>

#include "alloc-util.h"
#include "env-file.h"
#include "fd-util.h"
#include "hostname-util.h"
#include "missing_network.h"
#include "networkd-lldp-tx.h"
#include "networkd-manager.h"
#include "parse-util.h"
#include "random-util.h"
#include "socket-util.h"
#include "string-util.h"
#include "unaligned.h"

/* The LLDP spec calls this "txFastInit", see 9.2.5.19 */
#define LLDP_TX_FAST_INIT 4U

/* The LLDP spec calls this "msgTxHold", see 9.2.5.6 */
#define LLDP_TX_HOLD 4U

/* The jitter range to add, see 9.2.2. */
#define LLDP_JITTER_USEC (400U * USEC_PER_MSEC)

/* The LLDP spec calls this msgTxInterval, but we subtract half the jitter off it. */
#define LLDP_TX_INTERVAL_USEC (30U * USEC_PER_SEC - LLDP_JITTER_USEC / 2)

/* The LLDP spec calls this msgFastTx, but we subtract half the jitter off it. */
#define LLDP_FAST_TX_USEC (1U * USEC_PER_SEC - LLDP_JITTER_USEC / 2)

static const struct ether_addr lldp_multicast_addr[_LLDP_EMIT_MAX] = {
        [LLDP_EMIT_NEAREST_BRIDGE]  = {{ 0x01, 0x80, 0xc2, 0x00, 0x00, 0x0e }},
        [LLDP_EMIT_NON_TPMR_BRIDGE] = {{ 0x01, 0x80, 0xc2, 0x00, 0x00, 0x03 }},
        [LLDP_EMIT_CUSTOMER_BRIDGE] = {{ 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 }},
};

static int lldp_write_tlv_header(uint8_t **p, uint8_t id, size_t sz) {
        assert(p);

        if (id > 127)
                return -EBADMSG;
        if (sz > 511)
                return -ENOBUFS;

        (*p)[0] = (id << 1) | !!(sz & 256);
        (*p)[1] = sz & 255;

        *p = *p + 2;
        return 0;
}

static int lldp_make_packet(
                LLDPEmit mode,
                const struct ether_addr *hwaddr,
                const char *machine_id,
                const char *ifname,
                uint16_t ttl,
                const char *port_description,
                const char *hostname,
                const char *pretty_hostname,
                uint16_t system_capabilities,
                uint16_t enabled_capabilities,
                void **ret, size_t *sz) {

        size_t machine_id_length, ifname_length, port_description_length = 0, hostname_length = 0, pretty_hostname_length = 0;
        _cleanup_free_ void *packet = NULL;
        struct ether_header *h;
        uint8_t *p;
        size_t l;
        int r;

        assert(mode > LLDP_EMIT_NO);
        assert(mode < _LLDP_EMIT_MAX);
        assert(hwaddr);
        assert(machine_id);
        assert(ifname);
        assert(ret);
        assert(sz);

        machine_id_length = strlen(machine_id);
        ifname_length = strlen(ifname);

        if (port_description)
                port_description_length = strlen(port_description);

        if (hostname)
                hostname_length = strlen(hostname);

        if (pretty_hostname)
                pretty_hostname_length = strlen(pretty_hostname);

        l = sizeof(struct ether_header) +
                /* Chassis ID */
                2 + 1 + machine_id_length +
                /* Port ID */
                2 + 1 + ifname_length +
                /* TTL */
                2 + 2 +
                /* System Capabilities */
                2 + 4 +
                /* End */
                2;

        /* Port Description */
        if (port_description)
                l += 2 + port_description_length;

        /* System Name */
        if (hostname)
                l += 2 + hostname_length;

        /* System Description */
        if (pretty_hostname)
                l += 2 + pretty_hostname_length;

        packet = malloc(l);
        if (!packet)
                return -ENOMEM;

        h = (struct ether_header*) packet;
        h->ether_type = htobe16(ETHERTYPE_LLDP);
        memcpy(h->ether_dhost, lldp_multicast_addr + mode, ETH_ALEN);
        memcpy(h->ether_shost, hwaddr, ETH_ALEN);

        p = (uint8_t*) packet + sizeof(struct ether_header);

        r = lldp_write_tlv_header(&p, SD_LLDP_TYPE_CHASSIS_ID, 1 + machine_id_length);
        if (r < 0)
                return r;
        *(p++) = SD_LLDP_CHASSIS_SUBTYPE_LOCALLY_ASSIGNED;
        p = mempcpy(p, machine_id, machine_id_length);

        r = lldp_write_tlv_header(&p, SD_LLDP_TYPE_PORT_ID, 1 + ifname_length);
        if (r < 0)
                return r;
        *(p++) = SD_LLDP_PORT_SUBTYPE_INTERFACE_NAME;
        p = mempcpy(p, ifname, ifname_length);

        r = lldp_write_tlv_header(&p, SD_LLDP_TYPE_TTL, 2);
        if (r < 0)
                return r;
        unaligned_write_be16(p, ttl);
        p += 2;

        if (port_description) {
                r = lldp_write_tlv_header(&p, SD_LLDP_TYPE_PORT_DESCRIPTION, port_description_length);
                if (r < 0)
                        return r;
                p = mempcpy(p, port_description, port_description_length);
        }

        if (hostname) {
                r = lldp_write_tlv_header(&p, SD_LLDP_TYPE_SYSTEM_NAME, hostname_length);
                if (r < 0)
                        return r;
                p = mempcpy(p, hostname, hostname_length);
        }

        if (pretty_hostname) {
                r = lldp_write_tlv_header(&p, SD_LLDP_TYPE_SYSTEM_DESCRIPTION, pretty_hostname_length);
                if (r < 0)
                        return r;
                p = mempcpy(p, pretty_hostname, pretty_hostname_length);
        }

        r = lldp_write_tlv_header(&p, SD_LLDP_TYPE_SYSTEM_CAPABILITIES, 4);
        if (r < 0)
                return r;
        unaligned_write_be16(p, system_capabilities);
        p += 2;
        unaligned_write_be16(p, enabled_capabilities);
        p += 2;

        r = lldp_write_tlv_header(&p, SD_LLDP_TYPE_END, 0);
        if (r < 0)
                return r;

        assert(p == (uint8_t*) packet + l);

        *ret = TAKE_PTR(packet);
        *sz = l;

        return 0;
}

static int lldp_send_packet(
                int ifindex,
                const struct ether_addr *address,
                const void *packet,
                size_t packet_size) {

        union sockaddr_union sa = {
                .ll.sll_family = AF_PACKET,
                .ll.sll_protocol = htobe16(ETHERTYPE_LLDP),
                .ll.sll_ifindex = ifindex,
                .ll.sll_halen = ETH_ALEN,
        };

        _cleanup_close_ int fd = -1;
        ssize_t l;

        assert(ifindex > 0);
        assert(address);
        assert(packet || packet_size <= 0);

        memcpy(sa.ll.sll_addr, address, ETH_ALEN);

        fd = socket(PF_PACKET, SOCK_RAW|SOCK_CLOEXEC, IPPROTO_RAW);
        if (fd < 0)
                return -errno;

        l = sendto(fd, packet, packet_size, MSG_NOSIGNAL, &sa.sa, sizeof(sa.ll));
        if (l < 0)
                return -errno;

        if ((size_t) l != packet_size)
                return -EIO;

        return 0;
}

static int link_send_lldp(Link *link) {
        char machine_id_string[SD_ID128_STRING_MAX];
        _cleanup_free_ char *hostname = NULL, *pretty_hostname = NULL;
        _cleanup_free_ void *packet = NULL;
        size_t packet_size = 0;
        sd_id128_t machine_id;
        uint16_t caps;
        usec_t ttl;
        int r;

        assert(link);

        if (!link->network || link->network->lldp_emit == LLDP_EMIT_NO)
                return 0;

        assert(link->network->lldp_emit < _LLDP_EMIT_MAX);

        r = sd_id128_get_machine(&machine_id);
        if (r < 0)
                return r;

        (void) gethostname_strict(&hostname);
        (void) parse_env_file(NULL, "/etc/machine-info", "PRETTY_HOSTNAME", &pretty_hostname);

        assert_cc(LLDP_TX_INTERVAL_USEC * LLDP_TX_HOLD + 1 <= (UINT16_MAX - 1) * USEC_PER_SEC);
        ttl = DIV_ROUND_UP(LLDP_TX_INTERVAL_USEC * LLDP_TX_HOLD + 1, USEC_PER_SEC);

        caps = (link->network && link->network->ip_forward != ADDRESS_FAMILY_NO) ?
                SD_LLDP_SYSTEM_CAPABILITIES_ROUTER :
                SD_LLDP_SYSTEM_CAPABILITIES_STATION;

        r = lldp_make_packet(link->network->lldp_emit,
                             &link->mac,
                             sd_id128_to_string(machine_id, machine_id_string),
                             link->ifname,
                             (uint16_t) ttl,
                             link->network ? link->network->description : NULL,
                             hostname,
                             pretty_hostname,
                             SD_LLDP_SYSTEM_CAPABILITIES_STATION|SD_LLDP_SYSTEM_CAPABILITIES_BRIDGE|SD_LLDP_SYSTEM_CAPABILITIES_ROUTER,
                             caps,
                             &packet, &packet_size);
        if (r < 0)
                return r;

        return lldp_send_packet(link->ifindex, lldp_multicast_addr + link->network->lldp_emit, packet, packet_size);
}

static int on_lldp_timer(sd_event_source *s, usec_t t, void *userdata) {
        Link *link = userdata;
        usec_t current, delay, next;
        int r;

        assert(s);
        assert(userdata);

        log_link_debug(link, "Sending LLDP packet...");

        r = link_send_lldp(link);
        if (r < 0)
                log_link_debug_errno(link, r, "Failed to send LLDP packet, ignoring: %m");

        if (link->lldp_tx_fast > 0)
                link->lldp_tx_fast--;

        assert_se(sd_event_now(sd_event_source_get_event(s), clock_boottime_or_monotonic(), &current) >= 0);

        delay = link->lldp_tx_fast > 0 ? LLDP_FAST_TX_USEC : LLDP_TX_INTERVAL_USEC;
        next = usec_add(usec_add(current, delay), (usec_t) random_u64() % LLDP_JITTER_USEC);

        r = sd_event_source_set_time(s, next);
        if (r < 0)
                return log_link_error_errno(link, r, "Failed to restart LLDP timer: %m");

        r = sd_event_source_set_enabled(s, SD_EVENT_ONESHOT);
        if (r < 0)
                return log_link_error_errno(link, r, "Failed to enable LLDP timer: %m");

        return 0;
}

int link_lldp_emit_start(Link *link) {
        usec_t next;
        int r;

        assert(link);

        if (!link->network || link->network->lldp_emit == LLDP_EMIT_NO) {
                link_lldp_emit_stop(link);
                return 0;
        }

        /* Starts the LLDP transmission in "fast" mode. If it is already started, turns "fast" mode back on again. */

        link->lldp_tx_fast = LLDP_TX_FAST_INIT;

        next = usec_add(usec_add(now(clock_boottime_or_monotonic()), LLDP_FAST_TX_USEC),
                     (usec_t) random_u64() % LLDP_JITTER_USEC);

        if (link->lldp_emit_event_source) {
                usec_t old;

                /* Lower the timeout, maybe */
                r = sd_event_source_get_time(link->lldp_emit_event_source, &old);
                if (r < 0)
                        return r;

                if (old <= next)
                        return 0;

                return sd_event_source_set_time(link->lldp_emit_event_source, next);
        } else {
                r = sd_event_add_time(
                                link->manager->event,
                                &link->lldp_emit_event_source,
                                clock_boottime_or_monotonic(),
                                next,
                                0,
                                on_lldp_timer,
                                link);
                if (r < 0)
                        return r;

                (void) sd_event_source_set_description(link->lldp_emit_event_source, "lldp-tx");
        }

        return 0;
}

void link_lldp_emit_stop(Link *link) {
        assert(link);

        link->lldp_emit_event_source = sd_event_source_unref(link->lldp_emit_event_source);
}

int config_parse_lldp_emit(
                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) {

        LLDPEmit *emit = data;
        int r;

        assert(filename);
        assert(lvalue);
        assert(rvalue);

        if (isempty(rvalue))
                *emit = LLDP_EMIT_NO;
        else if (streq(rvalue, "nearest-bridge"))
                *emit = LLDP_EMIT_NEAREST_BRIDGE;
        else if (streq(rvalue, "non-tpmr-bridge"))
                *emit = LLDP_EMIT_NON_TPMR_BRIDGE;
        else if (streq(rvalue, "customer-bridge"))
                *emit = LLDP_EMIT_CUSTOMER_BRIDGE;
        else {
                r = parse_boolean(rvalue);
                if (r < 0) {
                        log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse LLDP emission setting, ignoring: %s", rvalue);
                        return 0;
                }

                *emit = r ? LLDP_EMIT_NEAREST_BRIDGE : LLDP_EMIT_NO;
        }

        return 0;
}
Commit	Line	Data
53e1b683	1	/* SPDX-License-Identifier: LGPL-2.1+ */
8e1ad1ea LP	2
	3	#include <endian.h>
	4	#include <inttypes.h>
	5	#include <string.h>
	6
634f0f98	7	#include "alloc-util.h"
686d13b9	8	#include "env-file.h"
8e1ad1ea	9	#include "fd-util.h"
8e1ad1ea	10	#include "hostname-util.h"
ef118d00	11	#include "missing_network.h"
7272b25e	12	#include "networkd-lldp-tx.h"
23f53b99	13	#include "networkd-manager.h"
7272b25e	14	#include "parse-util.h"
8e1ad1ea LP	15	#include "random-util.h"
	16	#include "socket-util.h"
	17	#include "string-util.h"
	18	#include "unaligned.h"
	19
	20	/* The LLDP spec calls this "txFastInit", see 9.2.5.19 */
	21	#define LLDP_TX_FAST_INIT 4U
	22
	23	/* The LLDP spec calls this "msgTxHold", see 9.2.5.6 */
	24	#define LLDP_TX_HOLD 4U
	25
	26	/* The jitter range to add, see 9.2.2. */
	27	#define LLDP_JITTER_USEC (400U * USEC_PER_MSEC)
	28
	29	/* The LLDP spec calls this msgTxInterval, but we subtract half the jitter off it. */
	30	#define LLDP_TX_INTERVAL_USEC (30U * USEC_PER_SEC - LLDP_JITTER_USEC / 2)
	31
	32	/* The LLDP spec calls this msgFastTx, but we subtract half the jitter off it. */
	33	#define LLDP_FAST_TX_USEC (1U * USEC_PER_SEC - LLDP_JITTER_USEC / 2)
	34
7272b25e LP	35	static const struct ether_addr lldp_multicast_addr[_LLDP_EMIT_MAX] = {
	36	[LLDP_EMIT_NEAREST_BRIDGE] = {{ 0x01, 0x80, 0xc2, 0x00, 0x00, 0x0e }},
	37	[LLDP_EMIT_NON_TPMR_BRIDGE] = {{ 0x01, 0x80, 0xc2, 0x00, 0x00, 0x03 }},
	38	[LLDP_EMIT_CUSTOMER_BRIDGE] = {{ 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 }},
	39	};
	40
8e1ad1ea LP	41	static int lldp_write_tlv_header(uint8_t **p, uint8_t id, size_t sz) {
	42	assert(p);
	43
	44	if (id > 127)
	45	return -EBADMSG;
	46	if (sz > 511)
	47	return -ENOBUFS;
	48
	49	(*p)[0] = (id << 1) \| !!(sz & 256);
	50	(*p)[1] = sz & 255;
	51
	52	p = p + 2;
	53	return 0;
	54	}
	55
	56	static int lldp_make_packet(
7272b25e	57	LLDPEmit mode,
8e1ad1ea LP	58	const struct ether_addr *hwaddr,
	59	const char *machine_id,
	60	const char *ifname,
	61	uint16_t ttl,
	62	const char *port_description,
	63	const char *hostname,
	64	const char *pretty_hostname,
	65	uint16_t system_capabilities,
	66	uint16_t enabled_capabilities,
	67	void *ret, size_t sz) {
	68
	69	size_t machine_id_length, ifname_length, port_description_length = 0, hostname_length = 0, pretty_hostname_length = 0;
	70	_cleanup_free_ void *packet = NULL;
	71	struct ether_header *h;
	72	uint8_t *p;
	73	size_t l;
	74	int r;
	75
7272b25e LP	76	assert(mode > LLDP_EMIT_NO);
7272b25e LP	77	assert(mode < _LLDP_EMIT_MAX);
8e1ad1ea LP	78	assert(hwaddr);
	79	assert(machine_id);
	80	assert(ifname);
	81	assert(ret);
	82	assert(sz);
	83
	84	machine_id_length = strlen(machine_id);
	85	ifname_length = strlen(ifname);
	86
	87	if (port_description)
	88	port_description_length = strlen(port_description);
	89
	90	if (hostname)
	91	hostname_length = strlen(hostname);
	92
	93	if (pretty_hostname)
	94	pretty_hostname_length = strlen(pretty_hostname);
	95
	96	l = sizeof(struct ether_header) +
	97	/* Chassis ID */
	98	2 + 1 + machine_id_length +
	99	/* Port ID */
	100	2 + 1 + ifname_length +
	101	/* TTL */
	102	2 + 2 +
	103	/* System Capabilities */
	104	2 + 4 +
	105	/* End */
	106	2;
	107
	108	/* Port Description */
	109	if (port_description)
	110	l += 2 + port_description_length;
	111
	112	/* System Name */
	113	if (hostname)
	114	l += 2 + hostname_length;
	115
	116	/* System Description */
	117	if (pretty_hostname)
	118	l += 2 + pretty_hostname_length;
	119
	120	packet = malloc(l);
	121	if (!packet)
	122	return -ENOMEM;
	123
	124	h = (struct ether_header*) packet;
	125	h->ether_type = htobe16(ETHERTYPE_LLDP);
7272b25e	126	memcpy(h->ether_dhost, lldp_multicast_addr + mode, ETH_ALEN);
8e1ad1ea LP	127	memcpy(h->ether_shost, hwaddr, ETH_ALEN);
	128
	129	p = (uint8_t*) packet + sizeof(struct ether_header);
	130
6afa6767	131	r = lldp_write_tlv_header(&p, SD_LLDP_TYPE_CHASSIS_ID, 1 + machine_id_length);
8e1ad1ea LP	132	if (r < 0)
8e1ad1ea LP	133	return r;
6afa6767	134	*(p++) = SD_LLDP_CHASSIS_SUBTYPE_LOCALLY_ASSIGNED;
8e1ad1ea LP	135	p = mempcpy(p, machine_id, machine_id_length);
8e1ad1ea LP	136
6afa6767	137	r = lldp_write_tlv_header(&p, SD_LLDP_TYPE_PORT_ID, 1 + ifname_length);
8e1ad1ea LP	138	if (r < 0)
8e1ad1ea LP	139	return r;
6afa6767	140	*(p++) = SD_LLDP_PORT_SUBTYPE_INTERFACE_NAME;
8e1ad1ea LP	141	p = mempcpy(p, ifname, ifname_length);
8e1ad1ea LP	142
6afa6767	143	r = lldp_write_tlv_header(&p, SD_LLDP_TYPE_TTL, 2);
8e1ad1ea LP	144	if (r < 0)
	145	return r;
	146	unaligned_write_be16(p, ttl);
	147	p += 2;
	148
	149	if (port_description) {
6afa6767	150	r = lldp_write_tlv_header(&p, SD_LLDP_TYPE_PORT_DESCRIPTION, port_description_length);
8e1ad1ea LP	151	if (r < 0)
	152	return r;
	153	p = mempcpy(p, port_description, port_description_length);
	154	}
	155
	156	if (hostname) {
6afa6767	157	r = lldp_write_tlv_header(&p, SD_LLDP_TYPE_SYSTEM_NAME, hostname_length);
8e1ad1ea LP	158	if (r < 0)
	159	return r;
	160	p = mempcpy(p, hostname, hostname_length);
	161	}
	162
	163	if (pretty_hostname) {
6afa6767	164	r = lldp_write_tlv_header(&p, SD_LLDP_TYPE_SYSTEM_DESCRIPTION, pretty_hostname_length);
8e1ad1ea LP	165	if (r < 0)
	166	return r;
	167	p = mempcpy(p, pretty_hostname, pretty_hostname_length);
	168	}
	169
6afa6767	170	r = lldp_write_tlv_header(&p, SD_LLDP_TYPE_SYSTEM_CAPABILITIES, 4);
8e1ad1ea LP	171	if (r < 0)
	172	return r;
	173	unaligned_write_be16(p, system_capabilities);
	174	p += 2;
	175	unaligned_write_be16(p, enabled_capabilities);
	176	p += 2;
	177
6afa6767	178	r = lldp_write_tlv_header(&p, SD_LLDP_TYPE_END, 0);
8e1ad1ea LP	179	if (r < 0)
	180	return r;
	181
	182	assert(p == (uint8_t*) packet + l);
	183
1cc6c93a	184	*ret = TAKE_PTR(packet);
8e1ad1ea LP	185	*sz = l;
8e1ad1ea LP	186
8e1ad1ea LP	187	return 0;
	188	}
	189
7272b25e LP	190	static int lldp_send_packet(
	191	int ifindex,
	192	const struct ether_addr *address,
	193	const void *packet,
	194	size_t packet_size) {
8e1ad1ea LP	195
	196	union sockaddr_union sa = {
	197	.ll.sll_family = AF_PACKET,
	198	.ll.sll_protocol = htobe16(ETHERTYPE_LLDP),
	199	.ll.sll_ifindex = ifindex,
	200	.ll.sll_halen = ETH_ALEN,
8e1ad1ea LP	201	};
	202
	203	_cleanup_close_ int fd = -1;
	204	ssize_t l;
	205
	206	assert(ifindex > 0);
7272b25e	207	assert(address);
8e1ad1ea LP	208	assert(packet \|\| packet_size <= 0);
8e1ad1ea LP	209
7272b25e LP	210	memcpy(sa.ll.sll_addr, address, ETH_ALEN);
7272b25e LP	211
8e1ad1ea LP	212	fd = socket(PF_PACKET, SOCK_RAW\|SOCK_CLOEXEC, IPPROTO_RAW);
	213	if (fd < 0)
	214	return -errno;
	215
	216	l = sendto(fd, packet, packet_size, MSG_NOSIGNAL, &sa.sa, sizeof(sa.ll));
	217	if (l < 0)
	218	return -errno;
	219
	220	if ((size_t) l != packet_size)
	221	return -EIO;
	222
	223	return 0;
	224	}
	225
	226	static int link_send_lldp(Link *link) {
	227	char machine_id_string[SD_ID128_STRING_MAX];
	228	_cleanup_free_ char hostname = NULL, pretty_hostname = NULL;
	229	_cleanup_free_ void *packet = NULL;
	230	size_t packet_size = 0;
	231	sd_id128_t machine_id;
	232	uint16_t caps;
	233	usec_t ttl;
	234	int r;
	235
7272b25e LP	236	assert(link);
	237
	238	if (!link->network \|\| link->network->lldp_emit == LLDP_EMIT_NO)
	239	return 0;
	240
	241	assert(link->network->lldp_emit < _LLDP_EMIT_MAX);
	242
8e1ad1ea LP	243	r = sd_id128_get_machine(&machine_id);
	244	if (r < 0)
	245	return r;
	246
	247	(void) gethostname_strict(&hostname);
13df9c39	248	(void) parse_env_file(NULL, "/etc/machine-info", "PRETTY_HOSTNAME", &pretty_hostname);
8e1ad1ea	249
c8cf4dc1	250	assert_cc(LLDP_TX_INTERVAL_USEC * LLDP_TX_HOLD + 1 <= (UINT16_MAX - 1) * USEC_PER_SEC);
8e1ad1ea	251	ttl = DIV_ROUND_UP(LLDP_TX_INTERVAL_USEC * LLDP_TX_HOLD + 1, USEC_PER_SEC);
8e1ad1ea LP	252
8e1ad1ea LP	253	caps = (link->network && link->network->ip_forward != ADDRESS_FAMILY_NO) ?
6afa6767 BG	254	SD_LLDP_SYSTEM_CAPABILITIES_ROUTER :
6afa6767 BG	255	SD_LLDP_SYSTEM_CAPABILITIES_STATION;
8e1ad1ea	256
7272b25e LP	257	r = lldp_make_packet(link->network->lldp_emit,
7272b25e LP	258	&link->mac,
8e1ad1ea LP	259	sd_id128_to_string(machine_id, machine_id_string),
	260	link->ifname,
	261	(uint16_t) ttl,
	262	link->network ? link->network->description : NULL,
	263	hostname,
	264	pretty_hostname,
6afa6767	265	SD_LLDP_SYSTEM_CAPABILITIES_STATION\|SD_LLDP_SYSTEM_CAPABILITIES_BRIDGE\|SD_LLDP_SYSTEM_CAPABILITIES_ROUTER,
8e1ad1ea LP	266	caps,
	267	&packet, &packet_size);
	268	if (r < 0)
	269	return r;
	270
7272b25e	271	return lldp_send_packet(link->ifindex, lldp_multicast_addr + link->network->lldp_emit, packet, packet_size);
8e1ad1ea LP	272	}
	273
	274	static int on_lldp_timer(sd_event_source s, usec_t t, void userdata) {
	275	Link *link = userdata;
	276	usec_t current, delay, next;
	277	int r;
	278
	279	assert(s);
	280	assert(userdata);
	281
	282	log_link_debug(link, "Sending LLDP packet...");
	283
	284	r = link_send_lldp(link);
	285	if (r < 0)
	286	log_link_debug_errno(link, r, "Failed to send LLDP packet, ignoring: %m");
	287
	288	if (link->lldp_tx_fast > 0)
	289	link->lldp_tx_fast--;
	290
	291	assert_se(sd_event_now(sd_event_source_get_event(s), clock_boottime_or_monotonic(), &current) >= 0);
	292
	293	delay = link->lldp_tx_fast > 0 ? LLDP_FAST_TX_USEC : LLDP_TX_INTERVAL_USEC;
	294	next = usec_add(usec_add(current, delay), (usec_t) random_u64() % LLDP_JITTER_USEC);
	295
	296	r = sd_event_source_set_time(s, next);
	297	if (r < 0)
	298	return log_link_error_errno(link, r, "Failed to restart LLDP timer: %m");
	299
	300	r = sd_event_source_set_enabled(s, SD_EVENT_ONESHOT);
	301	if (r < 0)
	302	return log_link_error_errno(link, r, "Failed to enable LLDP timer: %m");
	303
	304	return 0;
	305	}
	306
7272b25e	307	int link_lldp_emit_start(Link *link) {
8e1ad1ea LP	308	usec_t next;
	309	int r;
	310
	311	assert(link);
	312
7272b25e LP	313	if (!link->network \|\| link->network->lldp_emit == LLDP_EMIT_NO) {
	314	link_lldp_emit_stop(link);
	315	return 0;
	316	}
	317
8e1ad1ea LP	318	/* Starts the LLDP transmission in "fast" mode. If it is already started, turns "fast" mode back on again. */
	319
	320	link->lldp_tx_fast = LLDP_TX_FAST_INIT;
	321
	322	next = usec_add(usec_add(now(clock_boottime_or_monotonic()), LLDP_FAST_TX_USEC),
	323	(usec_t) random_u64() % LLDP_JITTER_USEC);
	324
7272b25e	325	if (link->lldp_emit_event_source) {
8e1ad1ea LP	326	usec_t old;
	327
	328	/* Lower the timeout, maybe */
7272b25e	329	r = sd_event_source_get_time(link->lldp_emit_event_source, &old);
8e1ad1ea LP	330	if (r < 0)
	331	return r;
	332
	333	if (old <= next)
	334	return 0;
	335
7272b25e	336	return sd_event_source_set_time(link->lldp_emit_event_source, next);
8e1ad1ea LP	337	} else {
	338	r = sd_event_add_time(
	339	link->manager->event,
7272b25e	340	&link->lldp_emit_event_source,
8e1ad1ea LP	341	clock_boottime_or_monotonic(),
	342	next,
	343	0,
	344	on_lldp_timer,
	345	link);
	346	if (r < 0)
	347	return r;
	348
7272b25e	349	(void) sd_event_source_set_description(link->lldp_emit_event_source, "lldp-tx");
8e1ad1ea LP	350	}
	351
	352	return 0;
	353	}
	354
7272b25e	355	void link_lldp_emit_stop(Link *link) {
8e1ad1ea LP	356	assert(link);
8e1ad1ea LP	357
7272b25e LP	358	link->lldp_emit_event_source = sd_event_source_unref(link->lldp_emit_event_source);
	359	}
	360
	361	int config_parse_lldp_emit(
	362	const char *unit,
	363	const char *filename,
	364	unsigned line,
	365	const char *section,
	366	unsigned section_line,
	367	const char *lvalue,
	368	int ltype,
	369	const char *rvalue,
	370	void *data,
	371	void *userdata) {
	372
	373	LLDPEmit *emit = data;
	374	int r;
	375
	376	assert(filename);
	377	assert(lvalue);
	378	assert(rvalue);
	379
	380	if (isempty(rvalue))
	381	*emit = LLDP_EMIT_NO;
	382	else if (streq(rvalue, "nearest-bridge"))
	383	*emit = LLDP_EMIT_NEAREST_BRIDGE;
	384	else if (streq(rvalue, "non-tpmr-bridge"))
	385	*emit = LLDP_EMIT_NON_TPMR_BRIDGE;
	386	else if (streq(rvalue, "customer-bridge"))
	387	*emit = LLDP_EMIT_CUSTOMER_BRIDGE;
	388	else {
	389	r = parse_boolean(rvalue);
	390	if (r < 0) {
	391	log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse LLDP emission setting, ignoring: %s", rvalue);
	392	return 0;
	393	}
	394
	395	*emit = r ? LLDP_EMIT_NEAREST_BRIDGE : LLDP_EMIT_NO;
	396	}
	397
	398	return 0;
8e1ad1ea	399	}