From 9b8b7ba40accbd303a3378d75022d6d92a2b7771 Mon Sep 17 00:00:00 2001
From: Tomas Pecka <peckato1@fit.cvut.cz>
Date: Mon, 7 Sep 2020 18:26:47 +0200
Subject: [PATCH] Move sd_lldp to libsystemd

Make sd_lldp public in libsystemd. Clients can therefore operate
with LLDP structures and files (e.g. parse LLDP neighbours).
---
 meson.build                            |   1 +
 src/fuzz/meson.build                   |   9 +-
 src/libsystemd-network/lldp-internal.h |  39 --
 src/libsystemd-network/lldp-neighbor.c | 769 -------------------------
 src/libsystemd-network/lldp-neighbor.h |  91 ---
 src/libsystemd-network/lldp-network.c  |  78 ---
 src/libsystemd-network/lldp-network.h  |   6 -
 src/libsystemd-network/meson.build     |   6 -
 src/libsystemd-network/sd-lldp.c       | 498 ----------------
 src/libsystemd-network/test-lldp.c     | 379 ------------
 src/libsystemd/libsystemd.sym          |  41 ++
 src/libsystemd/meson.build             |   6 +
 src/libsystemd/sd-lldp/lldp-internal.h |  39 ++
 src/libsystemd/sd-lldp/lldp-neighbor.c | 769 +++++++++++++++++++++++++
 src/libsystemd/sd-lldp/lldp-neighbor.h |  91 +++
 src/libsystemd/sd-lldp/lldp-network.c  |  78 +++
 src/libsystemd/sd-lldp/lldp-network.h  |   6 +
 src/libsystemd/sd-lldp/sd-lldp.c       | 498 ++++++++++++++++
 src/libsystemd/sd-lldp/test-lldp.c     | 379 ++++++++++++
 src/systemd/meson.build                |   2 +-
 src/test/meson.build                   |  10 +-
 21 files changed, 1919 insertions(+), 1876 deletions(-)
 delete mode 100644 src/libsystemd-network/lldp-internal.h
 delete mode 100644 src/libsystemd-network/lldp-neighbor.c
 delete mode 100644 src/libsystemd-network/lldp-neighbor.h
 delete mode 100644 src/libsystemd-network/lldp-network.c
 delete mode 100644 src/libsystemd-network/lldp-network.h
 delete mode 100644 src/libsystemd-network/sd-lldp.c
 delete mode 100644 src/libsystemd-network/test-lldp.c
 create mode 100644 src/libsystemd/sd-lldp/lldp-internal.h
 create mode 100644 src/libsystemd/sd-lldp/lldp-neighbor.c
 create mode 100644 src/libsystemd/sd-lldp/lldp-neighbor.h
 create mode 100644 src/libsystemd/sd-lldp/lldp-network.c
 create mode 100644 src/libsystemd/sd-lldp/lldp-network.h
 create mode 100644 src/libsystemd/sd-lldp/sd-lldp.c
 create mode 100644 src/libsystemd/sd-lldp/test-lldp.c

diff --git a/meson.build b/meson.build
index 8ccc947e37..1c2099d093 100644
--- a/meson.build
+++ b/meson.build
@@ -1398,6 +1398,7 @@ includes = include_directories('src/basic',
                                'src/libsystemd/sd-event',
                                'src/libsystemd/sd-hwdb',
                                'src/libsystemd/sd-id128',
+                               'src/libsystemd/sd-lldp',
                                'src/libsystemd/sd-netlink',
                                'src/libsystemd/sd-network',
                                'src/libsystemd/sd-resolve',
diff --git a/src/fuzz/meson.build b/src/fuzz/meson.build
index c88812d1de..8171bf58c1 100644
--- a/src/fuzz/meson.build
+++ b/src/fuzz/meson.build
@@ -33,8 +33,8 @@ fuzzers += [
          []],
 
         [['src/fuzz/fuzz-lldp.c'],
-         [libshared,
-          libsystemd_network],
+         [libbasic,libshared_static,libsystemd_static
+          ],
          []],
 
         [['src/fuzz/fuzz-ndisc-rs.c',
@@ -43,8 +43,9 @@ fuzzers += [
           'src/libsystemd-network/icmp6-util.h',
           'src/systemd/sd-dhcp6-client.h',
           'src/systemd/sd-ndisc.h'],
-         [libshared,
-          libsystemd_network],
+         [libsystemd_network,
+          libshared
+          ],
          []],
 
         [['src/fuzz/fuzz-json.c'],
diff --git a/src/libsystemd-network/lldp-internal.h b/src/libsystemd-network/lldp-internal.h
deleted file mode 100644
index 9598438dba..0000000000
--- a/src/libsystemd-network/lldp-internal.h
+++ /dev/null
@@ -1,39 +0,0 @@
-/* SPDX-License-Identifier: LGPL-2.1+ */
-#pragma once
-
-#include "sd-event.h"
-#include "sd-lldp.h"
-
-#include "hashmap.h"
-#include "log.h"
-#include "prioq.h"
-
-struct sd_lldp {
-        unsigned n_ref;
-
-        int ifindex;
-        int fd;
-
-        sd_event *event;
-        int64_t event_priority;
-        sd_event_source *io_event_source;
-        sd_event_source *timer_event_source;
-
-        Prioq *neighbor_by_expiry;
-        Hashmap *neighbor_by_id;
-
-        uint64_t neighbors_max;
-
-        sd_lldp_callback_t callback;
-        void *userdata;
-
-        uint16_t capability_mask;
-
-        struct ether_addr filter_address;
-};
-
-#define log_lldp_errno(error, fmt, ...) log_internal(LOG_DEBUG, error, PROJECT_FILE, __LINE__, __func__, "LLDP: " fmt, ##__VA_ARGS__)
-#define log_lldp(fmt, ...) log_lldp_errno(0, fmt, ##__VA_ARGS__)
-
-const char* lldp_event_to_string(sd_lldp_event e) _const_;
-sd_lldp_event lldp_event_from_string(const char *s) _pure_;
diff --git a/src/libsystemd-network/lldp-neighbor.c b/src/libsystemd-network/lldp-neighbor.c
deleted file mode 100644
index 9bae4a3c6e..0000000000
--- a/src/libsystemd-network/lldp-neighbor.c
+++ /dev/null
@@ -1,769 +0,0 @@
-/* SPDX-License-Identifier: LGPL-2.1+ */
-
-#include "alloc-util.h"
-#include "escape.h"
-#include "ether-addr-util.h"
-#include "hexdecoct.h"
-#include "in-addr-util.h"
-#include "lldp-internal.h"
-#include "lldp-neighbor.h"
-#include "memory-util.h"
-#include "missing.h"
-#include "unaligned.h"
-
-static void lldp_neighbor_id_hash_func(const LLDPNeighborID *id, struct siphash *state) {
-        siphash24_compress(id->chassis_id, id->chassis_id_size, state);
-        siphash24_compress(&id->chassis_id_size, sizeof(id->chassis_id_size), state);
-        siphash24_compress(id->port_id, id->port_id_size, state);
-        siphash24_compress(&id->port_id_size, sizeof(id->port_id_size), state);
-}
-
-int lldp_neighbor_id_compare_func(const LLDPNeighborID *x, const LLDPNeighborID *y) {
-        return memcmp_nn(x->chassis_id, x->chassis_id_size, y->chassis_id, y->chassis_id_size)
-            ?: memcmp_nn(x->port_id, x->port_id_size, y->port_id, y->port_id_size);
-}
-
-DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR(lldp_neighbor_hash_ops, LLDPNeighborID, lldp_neighbor_id_hash_func, lldp_neighbor_id_compare_func,
-                                      sd_lldp_neighbor, lldp_neighbor_unlink);
-
-int lldp_neighbor_prioq_compare_func(const void *a, const void *b) {
-        const sd_lldp_neighbor *x = a, *y = b;
-
-        return CMP(x->until, y->until);
-}
-
-_public_ sd_lldp_neighbor *sd_lldp_neighbor_ref(sd_lldp_neighbor *n) {
-        if (!n)
-                return NULL;
-
-        assert(n->n_ref > 0 || n->lldp);
-        n->n_ref++;
-
-        return n;
-}
-
-static void lldp_neighbor_free(sd_lldp_neighbor *n) {
-        assert(n);
-
-        free(n->id.port_id);
-        free(n->id.chassis_id);
-        free(n->port_description);
-        free(n->system_name);
-        free(n->system_description);
-        free(n->chassis_id_as_string);
-        free(n->port_id_as_string);
-        free(n);
-}
-
-_public_ sd_lldp_neighbor *sd_lldp_neighbor_unref(sd_lldp_neighbor *n) {
-
-        /* Drops one reference from the neighbor. Note that the object is not freed unless it is already unlinked from
-         * the sd_lldp object. */
-
-        if (!n)
-                return NULL;
-
-        assert(n->n_ref > 0);
-        n->n_ref--;
-
-        if (n->n_ref <= 0 && !n->lldp)
-                lldp_neighbor_free(n);
-
-        return NULL;
-}
-
-sd_lldp_neighbor *lldp_neighbor_unlink(sd_lldp_neighbor *n) {
-
-        /* Removes the neighbor object from the LLDP object, and frees it if it also has no other reference. */
-
-        if (!n)
-                return NULL;
-
-        if (!n->lldp)
-                return NULL;
-
-        /* Only remove the neighbor object from the hash table if it's in there, don't complain if it isn't. This is
-         * because we are used as destructor call for hashmap_clear() and thus sometimes are called to de-register
-         * ourselves from the hashtable and sometimes are called after we already are de-registered. */
-
-        (void) hashmap_remove_value(n->lldp->neighbor_by_id, &n->id, n);
-
-        assert_se(prioq_remove(n->lldp->neighbor_by_expiry, n, &n->prioq_idx) >= 0);
-
-        n->lldp = NULL;
-
-        if (n->n_ref <= 0)
-                lldp_neighbor_free(n);
-
-        return NULL;
-}
-
-sd_lldp_neighbor *lldp_neighbor_new(size_t raw_size) {
-        sd_lldp_neighbor *n;
-
-        n = malloc0(ALIGN(sizeof(sd_lldp_neighbor)) + raw_size);
-        if (!n)
-                return NULL;
-
-        n->raw_size = raw_size;
-        n->n_ref = 1;
-
-        return n;
-}
-
-static int parse_string(char **s, const void *q, size_t n) {
-        const char *p = q;
-        char *k;
-
-        assert(s);
-        assert(p || n == 0);
-
-        if (*s) {
-                log_lldp("Found duplicate string, ignoring field.");
-                return 0;
-        }
-
-        /* Strip trailing NULs, just to be nice */
-        while (n > 0 && p[n-1] == 0)
-                n--;
-
-        if (n <= 0) /* Ignore empty strings */
-                return 0;
-
-        /* Look for inner NULs */
-        if (memchr(p, 0, n)) {
-                log_lldp("Found inner NUL in string, ignoring field.");
-                return 0;
-        }
-
-        /* Let's escape weird chars, for security reasons */
-        k = cescape_length(p, n);
-        if (!k)
-                return -ENOMEM;
-
-        free(*s);
-        *s = k;
-
-        return 1;
-}
-
-int lldp_neighbor_parse(sd_lldp_neighbor *n) {
-        struct ether_header h;
-        const uint8_t *p;
-        size_t left;
-        int r;
-
-        assert(n);
-
-        if (n->raw_size < sizeof(struct ether_header)) {
-                log_lldp("Received truncated packet, ignoring.");
-                return -EBADMSG;
-        }
-
-        memcpy(&h, LLDP_NEIGHBOR_RAW(n), sizeof(h));
-
-        if (h.ether_type != htobe16(ETHERTYPE_LLDP)) {
-                log_lldp("Received packet with wrong type, ignoring.");
-                return -EBADMSG;
-        }
-
-        if (h.ether_dhost[0] != 0x01 ||
-            h.ether_dhost[1] != 0x80 ||
-            h.ether_dhost[2] != 0xc2 ||
-            h.ether_dhost[3] != 0x00 ||
-            h.ether_dhost[4] != 0x00 ||
-            !IN_SET(h.ether_dhost[5], 0x00, 0x03, 0x0e)) {
-                log_lldp("Received packet with wrong destination address, ignoring.");
-                return -EBADMSG;
-        }
-
-        memcpy(&n->source_address, h.ether_shost, sizeof(struct ether_addr));
-        memcpy(&n->destination_address, h.ether_dhost, sizeof(struct ether_addr));
-
-        p = (const uint8_t*) LLDP_NEIGHBOR_RAW(n) + sizeof(struct ether_header);
-        left = n->raw_size - sizeof(struct ether_header);
-
-        for (;;) {
-                uint8_t type;
-                uint16_t length;
-
-                if (left < 2) {
-                        log_lldp("TLV lacks header, ignoring.");
-                        return -EBADMSG;
-                }
-
-                type = p[0] >> 1;
-                length = p[1] + (((uint16_t) (p[0] & 1)) << 8);
-                p += 2, left -= 2;
-
-                if (left < length) {
-                        log_lldp("TLV truncated, ignoring datagram.");
-                        return -EBADMSG;
-                }
-
-                switch (type) {
-
-                case SD_LLDP_TYPE_END:
-                        if (length != 0) {
-                                log_lldp("End marker TLV not zero-sized, ignoring datagram.");
-                                return -EBADMSG;
-                        }
-
-                        /* Note that after processing the SD_LLDP_TYPE_END left could still be > 0
-                         * as the message may contain padding (see IEEE 802.1AB-2016, sec. 8.5.12) */
-
-                        goto end_marker;
-
-                case SD_LLDP_TYPE_CHASSIS_ID:
-                        if (length < 2 || length > 256) { /* includes the chassis subtype, hence one extra byte */
-                                log_lldp("Chassis ID field size out of range, ignoring datagram.");
-                                return -EBADMSG;
-                        }
-                        if (n->id.chassis_id) {
-                                log_lldp("Duplicate chassis ID field, ignoring datagram.");
-                                return -EBADMSG;
-                        }
-
-                        n->id.chassis_id = memdup(p, length);
-                        if (!n->id.chassis_id)
-                                return -ENOMEM;
-
-                        n->id.chassis_id_size = length;
-                        break;
-
-                case SD_LLDP_TYPE_PORT_ID:
-                        if (length < 2 || length > 256) { /* includes the port subtype, hence one extra byte */
-                                log_lldp("Port ID field size out of range, ignoring datagram.");
-                                return -EBADMSG;
-                        }
-                        if (n->id.port_id) {
-                                log_lldp("Duplicate port ID field, ignoring datagram.");
-                                return -EBADMSG;
-                        }
-
-                        n->id.port_id = memdup(p, length);
-                        if (!n->id.port_id)
-                                return -ENOMEM;
-
-                        n->id.port_id_size = length;
-                        break;
-
-                case SD_LLDP_TYPE_TTL:
-                        if (length != 2) {
-                                log_lldp("TTL field has wrong size, ignoring datagram.");
-                                return -EBADMSG;
-                        }
-
-                        if (n->has_ttl) {
-                                log_lldp("Duplicate TTL field, ignoring datagram.");
-                                return -EBADMSG;
-                        }
-
-                        n->ttl = unaligned_read_be16(p);
-                        n->has_ttl = true;
-                        break;
-
-                case SD_LLDP_TYPE_PORT_DESCRIPTION:
-                        r = parse_string(&n->port_description, p, length);
-                        if (r < 0)
-                                return r;
-                        break;
-
-                case SD_LLDP_TYPE_SYSTEM_NAME:
-                        r = parse_string(&n->system_name, p, length);
-                        if (r < 0)
-                                return r;
-                        break;
-
-                case SD_LLDP_TYPE_SYSTEM_DESCRIPTION:
-                        r = parse_string(&n->system_description, p, length);
-                        if (r < 0)
-                                return r;
-                        break;
-
-                case SD_LLDP_TYPE_SYSTEM_CAPABILITIES:
-                        if (length != 4)
-                                log_lldp("System capabilities field has wrong size, ignoring.");
-                        else {
-                                n->system_capabilities = unaligned_read_be16(p);
-                                n->enabled_capabilities = unaligned_read_be16(p + 2);
-                                n->has_capabilities = true;
-                        }
-
-                        break;
-
-                case SD_LLDP_TYPE_PRIVATE:
-                        if (length < 4)
-                                log_lldp("Found private TLV that is too short, ignoring.");
-
-                        break;
-                }
-
-                p += length, left -= length;
-        }
-
-end_marker:
-        if (!n->id.chassis_id || !n->id.port_id || !n->has_ttl) {
-                log_lldp("One or more mandatory TLV missing in datagram. Ignoring.");
-                return -EBADMSG;
-
-        }
-
-        n->rindex = sizeof(struct ether_header);
-
-        return 0;
-}
-
-void lldp_neighbor_start_ttl(sd_lldp_neighbor *n) {
-        assert(n);
-
-        if (n->ttl > 0) {
-                usec_t base;
-
-                /* Use the packet's timestamp if there is one known */
-                base = triple_timestamp_by_clock(&n->timestamp, clock_boottime_or_monotonic());
-                if (base <= 0 || base == USEC_INFINITY)
-                        base = now(clock_boottime_or_monotonic()); /* Otherwise, take the current time */
-
-                n->until = usec_add(base, n->ttl * USEC_PER_SEC);
-        } else
-                n->until = 0;
-
-        if (n->lldp)
-                prioq_reshuffle(n->lldp->neighbor_by_expiry, n, &n->prioq_idx);
-}
-
-bool lldp_neighbor_equal(const sd_lldp_neighbor *a, const sd_lldp_neighbor *b) {
-        if (a == b)
-                return true;
-
-        if (!a || !b)
-                return false;
-
-        if (a->raw_size != b->raw_size)
-                return false;
-
-        return memcmp(LLDP_NEIGHBOR_RAW(a), LLDP_NEIGHBOR_RAW(b), a->raw_size) == 0;
-}
-
-_public_ int sd_lldp_neighbor_get_source_address(sd_lldp_neighbor *n, struct ether_addr* address) {
-        assert_return(n, -EINVAL);
-        assert_return(address, -EINVAL);
-
-        *address = n->source_address;
-        return 0;
-}
-
-_public_ int sd_lldp_neighbor_get_destination_address(sd_lldp_neighbor *n, struct ether_addr* address) {
-        assert_return(n, -EINVAL);
-        assert_return(address, -EINVAL);
-
-        *address = n->destination_address;
-        return 0;
-}
-
-_public_ int sd_lldp_neighbor_get_raw(sd_lldp_neighbor *n, const void **ret, size_t *size) {
-        assert_return(n, -EINVAL);
-        assert_return(ret, -EINVAL);
-        assert_return(size, -EINVAL);
-
-        *ret = LLDP_NEIGHBOR_RAW(n);
-        *size = n->raw_size;
-
-        return 0;
-}
-
-_public_ int sd_lldp_neighbor_get_chassis_id(sd_lldp_neighbor *n, uint8_t *type, const void **ret, size_t *size) {
-        assert_return(n, -EINVAL);
-        assert_return(type, -EINVAL);
-        assert_return(ret, -EINVAL);
-        assert_return(size, -EINVAL);
-
-        assert(n->id.chassis_id_size > 0);
-
-        *type = *(uint8_t*) n->id.chassis_id;
-        *ret = (uint8_t*) n->id.chassis_id + 1;
-        *size = n->id.chassis_id_size - 1;
-
-        return 0;
-}
-
-static int format_mac_address(const void *data, size_t sz, char **ret) {
-        struct ether_addr a;
-        char *k;
-
-        assert(data || sz <= 0);
-
-        if (sz != 7)
-                return 0;
-
-        memcpy(&a, (uint8_t*) data + 1, sizeof(a));
-
-        k = new(char, ETHER_ADDR_TO_STRING_MAX);
-        if (!k)
-                return -ENOMEM;
-
-        *ret = ether_addr_to_string(&a, k);
-        return 1;
-}
-
-static int format_network_address(const void *data, size_t sz, char **ret) {
-        union in_addr_union a;
-        int family, r;
-
-        if (sz == 6 && ((uint8_t*) data)[1] == 1) {
-                memcpy(&a.in, (uint8_t*) data + 2, sizeof(a.in));
-                family = AF_INET;
-        } else if (sz == 18 && ((uint8_t*) data)[1] == 2) {
-                memcpy(&a.in6, (uint8_t*) data + 2, sizeof(a.in6));
-                family = AF_INET6;
-        } else
-                return 0;
-
-        r = in_addr_to_string(family, &a, ret);
-        if (r < 0)
-                return r;
-        return 1;
-}
-
-_public_ int sd_lldp_neighbor_get_chassis_id_as_string(sd_lldp_neighbor *n, const char **ret) {
-        char *k;
-        int r;
-
-        assert_return(n, -EINVAL);
-        assert_return(ret, -EINVAL);
-
-        if (n->chassis_id_as_string) {
-                *ret = n->chassis_id_as_string;
-                return 0;
-        }
-
-        assert(n->id.chassis_id_size > 0);
-
-        switch (*(uint8_t*) n->id.chassis_id) {
-
-        case SD_LLDP_CHASSIS_SUBTYPE_CHASSIS_COMPONENT:
-        case SD_LLDP_CHASSIS_SUBTYPE_INTERFACE_ALIAS:
-        case SD_LLDP_CHASSIS_SUBTYPE_PORT_COMPONENT:
-        case SD_LLDP_CHASSIS_SUBTYPE_INTERFACE_NAME:
-        case SD_LLDP_CHASSIS_SUBTYPE_LOCALLY_ASSIGNED:
-                k = cescape_length((char*) n->id.chassis_id + 1, n->id.chassis_id_size - 1);
-                if (!k)
-                        return -ENOMEM;
-
-                goto done;
-
-        case SD_LLDP_CHASSIS_SUBTYPE_MAC_ADDRESS:
-                r = format_mac_address(n->id.chassis_id, n->id.chassis_id_size, &k);
-                if (r < 0)
-                        return r;
-                if (r > 0)
-                        goto done;
-
-                break;
-
-        case SD_LLDP_CHASSIS_SUBTYPE_NETWORK_ADDRESS:
-                r = format_network_address(n->id.chassis_id, n->id.chassis_id_size, &k);
-                if (r < 0)
-                        return r;
-                if (r > 0)
-                        goto done;
-
-                break;
-        }
-
-        /* Generic fallback */
-        k = hexmem(n->id.chassis_id, n->id.chassis_id_size);
-        if (!k)
-                return -ENOMEM;
-
-done:
-        *ret = n->chassis_id_as_string = k;
-        return 0;
-}
-
-_public_ int sd_lldp_neighbor_get_port_id(sd_lldp_neighbor *n, uint8_t *type, const void **ret, size_t *size) {
-        assert_return(n, -EINVAL);
-        assert_return(type, -EINVAL);
-        assert_return(ret, -EINVAL);
-        assert_return(size, -EINVAL);
-
-        assert(n->id.port_id_size > 0);
-
-        *type = *(uint8_t*) n->id.port_id;
-        *ret = (uint8_t*) n->id.port_id + 1;
-        *size = n->id.port_id_size - 1;
-
-        return 0;
-}
-
-_public_ int sd_lldp_neighbor_get_port_id_as_string(sd_lldp_neighbor *n, const char **ret) {
-        char *k;
-        int r;
-
-        assert_return(n, -EINVAL);
-        assert_return(ret, -EINVAL);
-
-        if (n->port_id_as_string) {
-                *ret = n->port_id_as_string;
-                return 0;
-        }
-
-        assert(n->id.port_id_size > 0);
-
-        switch (*(uint8_t*) n->id.port_id) {
-
-        case SD_LLDP_PORT_SUBTYPE_INTERFACE_ALIAS:
-        case SD_LLDP_PORT_SUBTYPE_PORT_COMPONENT:
-        case SD_LLDP_PORT_SUBTYPE_INTERFACE_NAME:
-        case SD_LLDP_PORT_SUBTYPE_LOCALLY_ASSIGNED:
-                k = cescape_length((char*) n->id.port_id + 1, n->id.port_id_size - 1);
-                if (!k)
-                        return -ENOMEM;
-
-                goto done;
-
-        case SD_LLDP_PORT_SUBTYPE_MAC_ADDRESS:
-                r = format_mac_address(n->id.port_id, n->id.port_id_size, &k);
-                if (r < 0)
-                        return r;
-                if (r > 0)
-                        goto done;
-
-                break;
-
-        case SD_LLDP_PORT_SUBTYPE_NETWORK_ADDRESS:
-                r = format_network_address(n->id.port_id, n->id.port_id_size, &k);
-                if (r < 0)
-                        return r;
-                if (r > 0)
-                        goto done;
-
-                break;
-        }
-
-        /* Generic fallback */
-        k = hexmem(n->id.port_id, n->id.port_id_size);
-        if (!k)
-                return -ENOMEM;
-
-done:
-        *ret = n->port_id_as_string = k;
-        return 0;
-}
-
-_public_ int sd_lldp_neighbor_get_ttl(sd_lldp_neighbor *n, uint16_t *ret_sec) {
-        assert_return(n, -EINVAL);
-        assert_return(ret_sec, -EINVAL);
-
-        *ret_sec = n->ttl;
-        return 0;
-}
-
-_public_ int sd_lldp_neighbor_get_system_name(sd_lldp_neighbor *n, const char **ret) {
-        assert_return(n, -EINVAL);
-        assert_return(ret, -EINVAL);
-
-        if (!n->system_name)
-                return -ENODATA;
-
-        *ret = n->system_name;
-        return 0;
-}
-
-_public_ int sd_lldp_neighbor_get_system_description(sd_lldp_neighbor *n, const char **ret) {
-        assert_return(n, -EINVAL);
-        assert_return(ret, -EINVAL);
-
-        if (!n->system_description)
-                return -ENODATA;
-
-        *ret = n->system_description;
-        return 0;
-}
-
-_public_ int sd_lldp_neighbor_get_port_description(sd_lldp_neighbor *n, const char **ret) {
-        assert_return(n, -EINVAL);
-        assert_return(ret, -EINVAL);
-
-        if (!n->port_description)
-                return -ENODATA;
-
-        *ret = n->port_description;
-        return 0;
-}
-
-_public_ int sd_lldp_neighbor_get_system_capabilities(sd_lldp_neighbor *n, uint16_t *ret) {
-        assert_return(n, -EINVAL);
-        assert_return(ret, -EINVAL);
-
-        if (!n->has_capabilities)
-                return -ENODATA;
-
-        *ret = n->system_capabilities;
-        return 0;
-}
-
-_public_ int sd_lldp_neighbor_get_enabled_capabilities(sd_lldp_neighbor *n, uint16_t *ret) {
-        assert_return(n, -EINVAL);
-        assert_return(ret, -EINVAL);
-
-        if (!n->has_capabilities)
-                return -ENODATA;
-
-        *ret = n->enabled_capabilities;
-        return 0;
-}
-
-_public_ int sd_lldp_neighbor_from_raw(sd_lldp_neighbor **ret, const void *raw, size_t raw_size) {
-        _cleanup_(sd_lldp_neighbor_unrefp) sd_lldp_neighbor *n = NULL;
-        int r;
-
-        assert_return(ret, -EINVAL);
-        assert_return(raw || raw_size <= 0, -EINVAL);
-
-        n = lldp_neighbor_new(raw_size);
-        if (!n)
-                return -ENOMEM;
-
-        memcpy(LLDP_NEIGHBOR_RAW(n), raw, raw_size);
-        r = lldp_neighbor_parse(n);
-        if (r < 0)
-                return r;
-
-        *ret = TAKE_PTR(n);
-
-        return r;
-}
-
-_public_ int sd_lldp_neighbor_tlv_rewind(sd_lldp_neighbor *n) {
-        assert_return(n, -EINVAL);
-
-        assert(n->raw_size >= sizeof(struct ether_header));
-        n->rindex = sizeof(struct ether_header);
-
-        return n->rindex < n->raw_size;
-}
-
-_public_ int sd_lldp_neighbor_tlv_next(sd_lldp_neighbor *n) {
-        size_t length;
-
-        assert_return(n, -EINVAL);
-
-        if (n->rindex == n->raw_size) /* EOF */
-                return -ESPIPE;
-
-        if (n->rindex + 2 > n->raw_size) /* Truncated message */
-                return -EBADMSG;
-
-        length = LLDP_NEIGHBOR_TLV_LENGTH(n);
-        if (n->rindex + 2 + length > n->raw_size)
-                return -EBADMSG;
-
-        n->rindex += 2 + length;
-        return n->rindex < n->raw_size;
-}
-
-_public_ int sd_lldp_neighbor_tlv_get_type(sd_lldp_neighbor *n, uint8_t *type) {
-        assert_return(n, -EINVAL);
-        assert_return(type, -EINVAL);
-
-        if (n->rindex == n->raw_size) /* EOF */
-                return -ESPIPE;
-
-        if (n->rindex + 2 > n->raw_size)
-                return -EBADMSG;
-
-        *type = LLDP_NEIGHBOR_TLV_TYPE(n);
-        return 0;
-}
-
-_public_ int sd_lldp_neighbor_tlv_is_type(sd_lldp_neighbor *n, uint8_t type) {
-        uint8_t k;
-        int r;
-
-        assert_return(n, -EINVAL);
-
-        r = sd_lldp_neighbor_tlv_get_type(n, &k);
-        if (r < 0)
-                return r;
-
-        return type == k;
-}
-
-_public_ int sd_lldp_neighbor_tlv_get_oui(sd_lldp_neighbor *n, uint8_t oui[_SD_ARRAY_STATIC 3], uint8_t *subtype) {
-        const uint8_t *d;
-        size_t length;
-        int r;
-
-        assert_return(n, -EINVAL);
-        assert_return(oui, -EINVAL);
-        assert_return(subtype, -EINVAL);
-
-        r = sd_lldp_neighbor_tlv_is_type(n, SD_LLDP_TYPE_PRIVATE);
-        if (r < 0)
-                return r;
-        if (r == 0)
-                return -ENXIO;
-
-        length = LLDP_NEIGHBOR_TLV_LENGTH(n);
-        if (length < 4)
-                return -EBADMSG;
-
-        if (n->rindex + 2 + length > n->raw_size)
-                return -EBADMSG;
-
-        d = LLDP_NEIGHBOR_TLV_DATA(n);
-        memcpy(oui, d, 3);
-        *subtype = d[3];
-
-        return 0;
-}
-
-_public_ int sd_lldp_neighbor_tlv_is_oui(sd_lldp_neighbor *n, const uint8_t oui[_SD_ARRAY_STATIC 3], uint8_t subtype) {
-        uint8_t k[3], st;
-        int r;
-
-        r = sd_lldp_neighbor_tlv_get_oui(n, k, &st);
-        if (r == -ENXIO)
-                return 0;
-        if (r < 0)
-                return r;
-
-        return memcmp(k, oui, 3) == 0 && st == subtype;
-}
-
-_public_ int sd_lldp_neighbor_tlv_get_raw(sd_lldp_neighbor *n, const void **ret, size_t *size) {
-        size_t length;
-
-        assert_return(n, -EINVAL);
-        assert_return(ret, -EINVAL);
-        assert_return(size, -EINVAL);
-
-        /* Note that this returns the full TLV, including the TLV header */
-
-        if (n->rindex + 2 > n->raw_size)
-                return -EBADMSG;
-
-        length = LLDP_NEIGHBOR_TLV_LENGTH(n);
-        if (n->rindex + 2 + length > n->raw_size)
-                return -EBADMSG;
-
-        *ret = (uint8_t*) LLDP_NEIGHBOR_RAW(n) + n->rindex;
-        *size = length + 2;
-
-        return 0;
-}
-
-_public_ int sd_lldp_neighbor_get_timestamp(sd_lldp_neighbor *n, clockid_t clock, uint64_t *ret) {
-        assert_return(n, -EINVAL);
-        assert_return(TRIPLE_TIMESTAMP_HAS_CLOCK(clock), -EOPNOTSUPP);
-        assert_return(clock_supported(clock), -EOPNOTSUPP);
-        assert_return(ret, -EINVAL);
-
-        if (!triple_timestamp_is_set(&n->timestamp))
-                return -ENODATA;
-
-        *ret = triple_timestamp_by_clock(&n->timestamp, clock);
-        return 0;
-}
diff --git a/src/libsystemd-network/lldp-neighbor.h b/src/libsystemd-network/lldp-neighbor.h
deleted file mode 100644
index 62dbff42ca..0000000000
--- a/src/libsystemd-network/lldp-neighbor.h
+++ /dev/null
@@ -1,91 +0,0 @@
-/* SPDX-License-Identifier: LGPL-2.1+ */
-#pragma once
-
-#include <inttypes.h>
-#include <stdbool.h>
-#include <sys/types.h>
-
-#include "sd-lldp.h"
-
-#include "hash-funcs.h"
-#include "lldp-internal.h"
-#include "time-util.h"
-
-typedef struct LLDPNeighborID {
-        /* The spec calls this an "MSAP identifier" */
-        void *chassis_id;
-        size_t chassis_id_size;
-
-        void *port_id;
-        size_t port_id_size;
-} LLDPNeighborID;
-
-struct sd_lldp_neighbor {
-        /* Neighbor objects stay around as long as they are linked into an "sd_lldp" object or n_ref > 0. */
-        sd_lldp *lldp;
-        unsigned n_ref;
-
-        triple_timestamp timestamp;
-
-        usec_t until;
-        unsigned prioq_idx;
-
-        struct ether_addr source_address;
-        struct ether_addr destination_address;
-
-        LLDPNeighborID id;
-
-        /* The raw packet size. The data is appended to the object, accessible via LLDP_NEIGHBOR_RAW() */
-        size_t raw_size;
-
-        /* The current read index for the iterative TLV interface */
-        size_t rindex;
-
-        /* And a couple of fields parsed out. */
-        bool has_ttl:1;
-        bool has_capabilities:1;
-        bool has_port_vlan_id:1;
-
-        uint16_t ttl;
-
-        uint16_t system_capabilities;
-        uint16_t enabled_capabilities;
-
-        char *port_description;
-        char *system_name;
-        char *system_description;
-
-        uint16_t port_vlan_id;
-
-        char *chassis_id_as_string;
-        char *port_id_as_string;
-};
-
-static inline void *LLDP_NEIGHBOR_RAW(const sd_lldp_neighbor *n) {
-        return (uint8_t*) n + ALIGN(sizeof(sd_lldp_neighbor));
-}
-
-static inline uint8_t LLDP_NEIGHBOR_TLV_TYPE(const sd_lldp_neighbor *n) {
-        return ((uint8_t*) LLDP_NEIGHBOR_RAW(n))[n->rindex] >> 1;
-}
-
-static inline size_t LLDP_NEIGHBOR_TLV_LENGTH(const sd_lldp_neighbor *n) {
-        uint8_t *p;
-
-        p = (uint8_t*) LLDP_NEIGHBOR_RAW(n) + n->rindex;
-        return p[1] + (((size_t) (p[0] & 1)) << 8);
-}
-
-static inline void* LLDP_NEIGHBOR_TLV_DATA(const sd_lldp_neighbor *n) {
-        return ((uint8_t*) LLDP_NEIGHBOR_RAW(n)) + n->rindex + 2;
-}
-
-extern const struct hash_ops lldp_neighbor_hash_ops;
-int lldp_neighbor_id_compare_func(const LLDPNeighborID *x, const LLDPNeighborID *y);
-int lldp_neighbor_prioq_compare_func(const void *a, const void *b);
-
-sd_lldp_neighbor *lldp_neighbor_unlink(sd_lldp_neighbor *n);
-sd_lldp_neighbor *lldp_neighbor_new(size_t raw_size);
-int lldp_neighbor_parse(sd_lldp_neighbor *n);
-void lldp_neighbor_start_ttl(sd_lldp_neighbor *n);
-bool lldp_neighbor_equal(const sd_lldp_neighbor *a, const sd_lldp_neighbor *b);
diff --git a/src/libsystemd-network/lldp-network.c b/src/libsystemd-network/lldp-network.c
deleted file mode 100644
index 870584c0db..0000000000
--- a/src/libsystemd-network/lldp-network.c
+++ /dev/null
@@ -1,78 +0,0 @@
-/* SPDX-License-Identifier: LGPL-2.1+ */
-
-#include <linux/filter.h>
-#include <netinet/if_ether.h>
-
-#include "fd-util.h"
-#include "lldp-network.h"
-#include "missing.h"
-#include "socket-util.h"
-
-int lldp_network_bind_raw_socket(int ifindex) {
-
-        static const struct sock_filter filter[] = {
-                BPF_STMT(BPF_LD + BPF_W + BPF_ABS, offsetof(struct ethhdr, h_dest)),      /* A <- 4 bytes of destination MAC */
-                BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0x0180c200, 1, 0),                    /* A != 01:80:c2:00 */
-                BPF_STMT(BPF_RET + BPF_K, 0),                                             /* drop packet */
-                BPF_STMT(BPF_LD + BPF_H + BPF_ABS, offsetof(struct ethhdr, h_dest) + 4),  /* A <- remaining 2 bytes of destination MAC */
-                BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0x0000, 3, 0),                        /* A != 00:00 */
-                BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0x0003, 2, 0),                        /* A != 00:03 */
-                BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0x000e, 1, 0),                        /* A != 00:0e */
-                BPF_STMT(BPF_RET + BPF_K, 0),                                             /* drop packet */
-                BPF_STMT(BPF_LD + BPF_H + BPF_ABS, offsetof(struct ethhdr, h_proto)),     /* A <- protocol */
-                BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, ETHERTYPE_LLDP, 1, 0),                /* A != ETHERTYPE_LLDP */
-                BPF_STMT(BPF_RET + BPF_K, 0),                                             /* drop packet */
-                BPF_STMT(BPF_RET + BPF_K, (uint32_t) -1),                                 /* accept packet */
-        };
-
-        static const struct sock_fprog fprog = {
-                .len = ELEMENTSOF(filter),
-                .filter = (struct sock_filter*) filter,
-        };
-
-        struct packet_mreq mreq = {
-                .mr_ifindex = ifindex,
-                .mr_type = PACKET_MR_MULTICAST,
-                .mr_alen = ETH_ALEN,
-                .mr_address = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x00 }
-        };
-
-        union sockaddr_union saddrll = {
-                .ll.sll_family = AF_PACKET,
-                .ll.sll_ifindex = ifindex,
-        };
-
-        _cleanup_close_ int fd = -1;
-        int r;
-
-        assert(ifindex > 0);
-
-        fd = socket(PF_PACKET, SOCK_RAW|SOCK_CLOEXEC|SOCK_NONBLOCK,
-                    htobe16(ETHERTYPE_LLDP));
-        if (fd < 0)
-                return -errno;
-
-        r = setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &fprog, sizeof(fprog));
-        if (r < 0)
-                return -errno;
-
-        r = setsockopt(fd, SOL_PACKET, PACKET_ADD_MEMBERSHIP, &mreq, sizeof(mreq));
-        if (r < 0)
-                return -errno;
-
-        mreq.mr_address[ETH_ALEN - 1] = 0x03;
-        r = setsockopt(fd, SOL_PACKET, PACKET_ADD_MEMBERSHIP, &mreq, sizeof(mreq));
-        if (r < 0)
-                return -errno;
-
-        mreq.mr_address[ETH_ALEN - 1] = 0x0E;
-        r = setsockopt(fd, SOL_PACKET, PACKET_ADD_MEMBERSHIP, &mreq, sizeof(mreq));
-        if (r < 0)
-                return -errno;
-
-        r = bind(fd, &saddrll.sa, sizeof(saddrll.ll));
-        if (r < 0)
-                return -errno;
-
-        return TAKE_FD(fd);
-}
diff --git a/src/libsystemd-network/lldp-network.h b/src/libsystemd-network/lldp-network.h
deleted file mode 100644
index e4ed2898a5..0000000000
--- a/src/libsystemd-network/lldp-network.h
+++ /dev/null
@@ -1,6 +0,0 @@
-/* SPDX-License-Identifier: LGPL-2.1+ */
-#pragma once
-
-#include "sd-event.h"
-
-int lldp_network_bind_raw_socket(int ifindex);
diff --git a/src/libsystemd-network/meson.build b/src/libsystemd-network/meson.build
index 56d470ff68..88a72aa900 100644
--- a/src/libsystemd-network/meson.build
+++ b/src/libsystemd-network/meson.build
@@ -33,12 +33,6 @@ sources = files('''
         sd-dhcp6-lease.c
         dhcp-identifier.h
         dhcp-identifier.c
-        lldp-internal.h
-        lldp-network.h
-        lldp-network.c
-        lldp-neighbor.h
-        lldp-neighbor.c
-        sd-lldp.c
 '''.split())
 
 network_internal_h = files('network-internal.h')
diff --git a/src/libsystemd-network/sd-lldp.c b/src/libsystemd-network/sd-lldp.c
deleted file mode 100644
index 1f28c5731f..0000000000
--- a/src/libsystemd-network/sd-lldp.c
+++ /dev/null
@@ -1,498 +0,0 @@
-/* SPDX-License-Identifier: LGPL-2.1+ */
-
-#include <arpa/inet.h>
-#include <linux/sockios.h>
-#include <sys/ioctl.h>
-
-#include "sd-lldp.h"
-
-#include "alloc-util.h"
-#include "ether-addr-util.h"
-#include "event-util.h"
-#include "fd-util.h"
-#include "lldp-internal.h"
-#include "lldp-neighbor.h"
-#include "lldp-network.h"
-#include "memory-util.h"
-#include "socket-util.h"
-#include "sort-util.h"
-#include "string-table.h"
-
-#define LLDP_DEFAULT_NEIGHBORS_MAX 128U
-
-static const char * const lldp_event_table[_SD_LLDP_EVENT_MAX] = {
-        [SD_LLDP_EVENT_ADDED]   = "added",
-        [SD_LLDP_EVENT_REMOVED] = "removed",
-        [SD_LLDP_EVENT_UPDATED]   = "updated",
-        [SD_LLDP_EVENT_REFRESHED] = "refreshed",
-};
-
-DEFINE_STRING_TABLE_LOOKUP(lldp_event, sd_lldp_event);
-
-static void lldp_flush_neighbors(sd_lldp *lldp) {
-        assert(lldp);
-
-        hashmap_clear(lldp->neighbor_by_id);
-}
-
-static void lldp_callback(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n) {
-        assert(lldp);
-        assert(event >= 0 && event < _SD_LLDP_EVENT_MAX);
-
-        if (!lldp->callback) {
-                log_lldp("Received '%s' event.", lldp_event_to_string(event));
-                return;
-        }
-
-        log_lldp("Invoking callback for '%s' event.", lldp_event_to_string(event));
-        lldp->callback(lldp, event, n, lldp->userdata);
-}
-
-static int lldp_make_space(sd_lldp *lldp, size_t extra) {
-        usec_t t = USEC_INFINITY;
-        bool changed = false;
-
-        assert(lldp);
-
-        /* Remove all entries that are past their TTL, and more until at least the specified number of extra entries
-         * are free. */
-
-        for (;;) {
-                _cleanup_(sd_lldp_neighbor_unrefp) sd_lldp_neighbor *n = NULL;
-
-                n = prioq_peek(lldp->neighbor_by_expiry);
-                if (!n)
-                        break;
-
-                sd_lldp_neighbor_ref(n);
-
-                if (hashmap_size(lldp->neighbor_by_id) > LESS_BY(lldp->neighbors_max, extra))
-                        goto remove_one;
-
-                if (t == USEC_INFINITY)
-                        t = now(clock_boottime_or_monotonic());
-
-                if (n->until > t)
-                        break;
-
-        remove_one:
-                lldp_neighbor_unlink(n);
-                lldp_callback(lldp, SD_LLDP_EVENT_REMOVED, n);
-                changed = true;
-        }
-
-        return changed;
-}
-
-static bool lldp_keep_neighbor(sd_lldp *lldp, sd_lldp_neighbor *n) {
-        assert(lldp);
-        assert(n);
-
-        /* Don't keep data with a zero TTL */
-        if (n->ttl <= 0)
-                return false;
-
-        /* Filter out data from the filter address */
-        if (!ether_addr_is_null(&lldp->filter_address) &&
-            ether_addr_equal(&lldp->filter_address, &n->source_address))
-                return false;
-
-        /* Only add if the neighbor has a capability we are interested in. Note that we also store all neighbors with
-         * no caps field set. */
-        if (n->has_capabilities &&
-            (n->enabled_capabilities & lldp->capability_mask) == 0)
-                return false;
-
-        /* Keep everything else */
-        return true;
-}
-
-static int lldp_start_timer(sd_lldp *lldp, sd_lldp_neighbor *neighbor);
-
-static int lldp_add_neighbor(sd_lldp *lldp, sd_lldp_neighbor *n) {
-        _cleanup_(sd_lldp_neighbor_unrefp) sd_lldp_neighbor *old = NULL;
-        bool keep;
-        int r;
-
-        assert(lldp);
-        assert(n);
-        assert(!n->lldp);
-
-        keep = lldp_keep_neighbor(lldp, n);
-
-        /* First retrieve the old entry for this MSAP */
-        old = hashmap_get(lldp->neighbor_by_id, &n->id);
-        if (old) {
-                sd_lldp_neighbor_ref(old);
-
-                if (!keep) {
-                        lldp_neighbor_unlink(old);
-                        lldp_callback(lldp, SD_LLDP_EVENT_REMOVED, old);
-                        return 0;
-                }
-
-                if (lldp_neighbor_equal(n, old)) {
-                        /* Is this equal, then restart the TTL counter, but don't do anything else. */
-                        old->timestamp = n->timestamp;
-                        lldp_start_timer(lldp, old);
-                        lldp_callback(lldp, SD_LLDP_EVENT_REFRESHED, old);
-                        return 0;
-                }
-
-                /* Data changed, remove the old entry, and add a new one */
-                lldp_neighbor_unlink(old);
-
-        } else if (!keep)
-                return 0;
-
-        /* Then, make room for at least one new neighbor */
-        lldp_make_space(lldp, 1);
-
-        r = hashmap_put(lldp->neighbor_by_id, &n->id, n);
-        if (r < 0)
-                goto finish;
-
-        r = prioq_put(lldp->neighbor_by_expiry, n, &n->prioq_idx);
-        if (r < 0) {
-                assert_se(hashmap_remove(lldp->neighbor_by_id, &n->id) == n);
-                goto finish;
-        }
-
-        n->lldp = lldp;
-
-        lldp_start_timer(lldp, n);
-        lldp_callback(lldp, old ? SD_LLDP_EVENT_UPDATED : SD_LLDP_EVENT_ADDED, n);
-
-        return 1;
-
-finish:
-        if (old)
-                lldp_callback(lldp, SD_LLDP_EVENT_REMOVED, old);
-
-        return r;
-}
-
-static int lldp_handle_datagram(sd_lldp *lldp, sd_lldp_neighbor *n) {
-        int r;
-
-        assert(lldp);
-        assert(n);
-
-        r = lldp_neighbor_parse(n);
-        if (r == -EBADMSG) /* Ignore bad messages */
-                return 0;
-        if (r < 0)
-                return r;
-
-        r = lldp_add_neighbor(lldp, n);
-        if (r < 0) {
-                log_lldp_errno(r, "Failed to add datagram. Ignoring.");
-                return 0;
-        }
-
-        log_lldp("Successfully processed LLDP datagram.");
-        return 0;
-}
-
-static int lldp_receive_datagram(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
-        _cleanup_(sd_lldp_neighbor_unrefp) sd_lldp_neighbor *n = NULL;
-        ssize_t space, length;
-        sd_lldp *lldp = userdata;
-        struct timespec ts;
-
-        assert(fd >= 0);
-        assert(lldp);
-
-        space = next_datagram_size_fd(fd);
-        if (space < 0)
-                return log_lldp_errno(space, "Failed to determine datagram size to read: %m");
-
-        n = lldp_neighbor_new(space);
-        if (!n)
-                return -ENOMEM;
-
-        length = recv(fd, LLDP_NEIGHBOR_RAW(n), n->raw_size, MSG_DONTWAIT);
-        if (length < 0) {
-                if (IN_SET(errno, EAGAIN, EINTR))
-                        return 0;
-
-                return log_lldp_errno(errno, "Failed to read LLDP datagram: %m");
-        }
-
-        if ((size_t) length != n->raw_size) {
-                log_lldp("Packet size mismatch.");
-                return -EINVAL;
-        }
-
-        /* Try to get the timestamp of this packet if it is known */
-        if (ioctl(fd, SIOCGSTAMPNS, &ts) >= 0)
-                triple_timestamp_from_realtime(&n->timestamp, timespec_load(&ts));
-        else
-                triple_timestamp_get(&n->timestamp);
-
-        return lldp_handle_datagram(lldp, n);
-}
-
-static void lldp_reset(sd_lldp *lldp) {
-        assert(lldp);
-
-        (void) event_source_disable(lldp->timer_event_source);
-        lldp->io_event_source = sd_event_source_unref(lldp->io_event_source);
-        lldp->fd = safe_close(lldp->fd);
-}
-
-_public_ int sd_lldp_start(sd_lldp *lldp) {
-        int r;
-
-        assert_return(lldp, -EINVAL);
-        assert_return(lldp->event, -EINVAL);
-        assert_return(lldp->ifindex > 0, -EINVAL);
-
-        if (lldp->fd >= 0)
-                return 0;
-
-        assert(!lldp->io_event_source);
-
-        lldp->fd = lldp_network_bind_raw_socket(lldp->ifindex);
-        if (lldp->fd < 0)
-                return lldp->fd;
-
-        r = sd_event_add_io(lldp->event, &lldp->io_event_source, lldp->fd, EPOLLIN, lldp_receive_datagram, lldp);
-        if (r < 0)
-                goto fail;
-
-        r = sd_event_source_set_priority(lldp->io_event_source, lldp->event_priority);
-        if (r < 0)
-                goto fail;
-
-        (void) sd_event_source_set_description(lldp->io_event_source, "lldp-io");
-
-        log_lldp("Started LLDP client");
-        return 1;
-
-fail:
-        lldp_reset(lldp);
-        return r;
-}
-
-_public_ int sd_lldp_stop(sd_lldp *lldp) {
-        assert_return(lldp, -EINVAL);
-
-        if (lldp->fd < 0)
-                return 0;
-
-        log_lldp("Stopping LLDP client");
-
-        lldp_reset(lldp);
-        lldp_flush_neighbors(lldp);
-
-        return 1;
-}
-
-_public_ int sd_lldp_attach_event(sd_lldp *lldp, sd_event *event, int64_t priority) {
-        int r;
-
-        assert_return(lldp, -EINVAL);
-        assert_return(lldp->fd < 0, -EBUSY);
-        assert_return(!lldp->event, -EBUSY);
-
-        if (event)
-                lldp->event = sd_event_ref(event);
-        else {
-                r = sd_event_default(&lldp->event);
-                if (r < 0)
-                        return r;
-        }
-
-        lldp->event_priority = priority;
-
-        return 0;
-}
-
-_public_ int sd_lldp_detach_event(sd_lldp *lldp) {
-
-        assert_return(lldp, -EINVAL);
-        assert_return(lldp->fd < 0, -EBUSY);
-
-        lldp->event = sd_event_unref(lldp->event);
-        return 0;
-}
-
-_public_ sd_event* sd_lldp_get_event(sd_lldp *lldp) {
-        assert_return(lldp, NULL);
-
-        return lldp->event;
-}
-
-_public_ int sd_lldp_set_callback(sd_lldp *lldp, sd_lldp_callback_t cb, void *userdata) {
-        assert_return(lldp, -EINVAL);
-
-        lldp->callback = cb;
-        lldp->userdata = userdata;
-
-        return 0;
-}
-
-_public_ int sd_lldp_set_ifindex(sd_lldp *lldp, int ifindex) {
-        assert_return(lldp, -EINVAL);
-        assert_return(ifindex > 0, -EINVAL);
-        assert_return(lldp->fd < 0, -EBUSY);
-
-        lldp->ifindex = ifindex;
-        return 0;
-}
-
-static sd_lldp* lldp_free(sd_lldp *lldp) {
-        assert(lldp);
-
-        lldp->timer_event_source = sd_event_source_unref(lldp->timer_event_source);
-
-        lldp_reset(lldp);
-        sd_lldp_detach_event(lldp);
-        lldp_flush_neighbors(lldp);
-
-        hashmap_free(lldp->neighbor_by_id);
-        prioq_free(lldp->neighbor_by_expiry);
-        return mfree(lldp);
-}
-
-DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_lldp, sd_lldp, lldp_free);
-
-_public_ int sd_lldp_new(sd_lldp **ret) {
-        _cleanup_(sd_lldp_unrefp) sd_lldp *lldp = NULL;
-        int r;
-
-        assert_return(ret, -EINVAL);
-
-        lldp = new(sd_lldp, 1);
-        if (!lldp)
-                return -ENOMEM;
-
-        *lldp = (sd_lldp) {
-                .n_ref = 1,
-                .fd = -1,
-                .neighbors_max = LLDP_DEFAULT_NEIGHBORS_MAX,
-                .capability_mask = (uint16_t) -1,
-        };
-
-        lldp->neighbor_by_id = hashmap_new(&lldp_neighbor_hash_ops);
-        if (!lldp->neighbor_by_id)
-                return -ENOMEM;
-
-        r = prioq_ensure_allocated(&lldp->neighbor_by_expiry, lldp_neighbor_prioq_compare_func);
-        if (r < 0)
-                return r;
-
-        *ret = TAKE_PTR(lldp);
-
-        return 0;
-}
-
-static int neighbor_compare_func(sd_lldp_neighbor * const *a, sd_lldp_neighbor * const *b) {
-        return lldp_neighbor_id_compare_func(&(*a)->id, &(*b)->id);
-}
-
-static int on_timer_event(sd_event_source *s, uint64_t usec, void *userdata) {
-        sd_lldp *lldp = userdata;
-        int r;
-
-        r = lldp_make_space(lldp, 0);
-        if (r < 0)
-                return log_lldp_errno(r, "Failed to make space: %m");
-
-        r = lldp_start_timer(lldp, NULL);
-        if (r < 0)
-                return log_lldp_errno(r, "Failed to restart timer: %m");
-
-        return 0;
-}
-
-static int lldp_start_timer(sd_lldp *lldp, sd_lldp_neighbor *neighbor) {
-        sd_lldp_neighbor *n;
-
-        assert(lldp);
-
-        if (neighbor)
-                lldp_neighbor_start_ttl(neighbor);
-
-        n = prioq_peek(lldp->neighbor_by_expiry);
-        if (!n)
-                return event_source_disable(lldp->timer_event_source);
-
-        if (!lldp->event)
-                return 0;
-
-        return event_reset_time(lldp->event, &lldp->timer_event_source,
-                                clock_boottime_or_monotonic(),
-                                n->until, 0,
-                                on_timer_event, lldp,
-                                lldp->event_priority, "lldp-timer", true);
-}
-
-_public_ int sd_lldp_get_neighbors(sd_lldp *lldp, sd_lldp_neighbor ***ret) {
-        sd_lldp_neighbor **l = NULL, *n;
-        Iterator i;
-        int k = 0, r;
-
-        assert_return(lldp, -EINVAL);
-        assert_return(ret, -EINVAL);
-
-        if (hashmap_isempty(lldp->neighbor_by_id)) { /* Special shortcut */
-                *ret = NULL;
-                return 0;
-        }
-
-        l = new0(sd_lldp_neighbor*, hashmap_size(lldp->neighbor_by_id));
-        if (!l)
-                return -ENOMEM;
-
-        r = lldp_start_timer(lldp, NULL);
-        if (r < 0) {
-                free(l);
-                return r;
-        }
-
-        HASHMAP_FOREACH(n, lldp->neighbor_by_id, i)
-                l[k++] = sd_lldp_neighbor_ref(n);
-
-        assert((size_t) k == hashmap_size(lldp->neighbor_by_id));
-
-        /* Return things in a stable order */
-        typesafe_qsort(l, k, neighbor_compare_func);
-        *ret = l;
-
-        return k;
-}
-
-_public_ int sd_lldp_set_neighbors_max(sd_lldp *lldp, uint64_t m) {
-        assert_return(lldp, -EINVAL);
-        assert_return(m <= 0, -EINVAL);
-
-        lldp->neighbors_max = m;
-        lldp_make_space(lldp, 0);
-
-        return 0;
-}
-
-_public_ int sd_lldp_match_capabilities(sd_lldp *lldp, uint16_t mask) {
-        assert_return(lldp, -EINVAL);
-        assert_return(mask != 0, -EINVAL);
-
-        lldp->capability_mask = mask;
-
-        return 0;
-}
-
-_public_ int sd_lldp_set_filter_address(sd_lldp *lldp, const struct ether_addr *addr) {
-        assert_return(lldp, -EINVAL);
-
-        /* In order to deal nicely with bridges that send back our own packets, allow one address to be filtered, so
-         * that our own can be filtered out here. */
-
-        if (addr)
-                lldp->filter_address = *addr;
-        else
-                zero(lldp->filter_address);
-
-        return 0;
-}
diff --git a/src/libsystemd-network/test-lldp.c b/src/libsystemd-network/test-lldp.c
deleted file mode 100644
index 7406f94ce0..0000000000
--- a/src/libsystemd-network/test-lldp.c
+++ /dev/null
@@ -1,379 +0,0 @@
-/* SPDX-License-Identifier: LGPL-2.1+ */
-
-#include <arpa/inet.h>
-#include <errno.h>
-#include <net/ethernet.h>
-#include <stdio.h>
-#include <string.h>
-#include <unistd.h>
-
-#include "sd-event.h"
-#include "sd-lldp.h"
-
-#include "alloc-util.h"
-#include "fd-util.h"
-#include "lldp-network.h"
-#include "macro.h"
-#include "string-util.h"
-#include "tests.h"
-
-#define TEST_LLDP_PORT "em1"
-#define TEST_LLDP_TYPE_SYSTEM_NAME "systemd-lldp"
-#define TEST_LLDP_TYPE_SYSTEM_DESC "systemd-lldp-desc"
-
-static int test_fd[2] = { -1, -1 };
-static int lldp_handler_calls;
-
-int lldp_network_bind_raw_socket(int ifindex) {
-        if (socketpair(AF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0, test_fd) < 0)
-                return -errno;
-
-        return test_fd[0];
-}
-
-static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
-        lldp_handler_calls++;
-}
-
-static int start_lldp(sd_lldp **lldp, sd_event *e, sd_lldp_callback_t cb, void *cb_data) {
-        int r;
-
-        r = sd_lldp_new(lldp);
-        if (r < 0)
-                return r;
-
-        r = sd_lldp_set_ifindex(*lldp, 42);
-        if (r < 0)
-                return r;
-
-        r = sd_lldp_set_callback(*lldp, cb, cb_data);
-        if (r < 0)
-                return r;
-
-        r = sd_lldp_attach_event(*lldp, e, 0);
-        if (r < 0)
-                return r;
-
-        r = sd_lldp_start(*lldp);
-        if (r < 0)
-                return r;
-
-        return 0;
-}
-
-static int stop_lldp(sd_lldp *lldp) {
-        int r;
-
-        r = sd_lldp_stop(lldp);
-        if (r < 0)
-                return r;
-
-        r = sd_lldp_detach_event(lldp);
-        if (r < 0)
-                return r;
-
-        sd_lldp_unref(lldp);
-        safe_close(test_fd[1]);
-
-        return 0;
-}
-
-static void test_receive_basic_packet(sd_event *e) {
-
-        static const uint8_t frame[] = {
-                /* Ethernet header */
-                0x01, 0x80, 0xc2, 0x00, 0x00, 0x03,     /* Destination MAC */
-                0x01, 0x02, 0x03, 0x04, 0x05, 0x06,     /* Source MAC */
-                0x88, 0xcc,                             /* Ethertype */
-                /* LLDP mandatory TLVs */
-                0x02, 0x07, 0x04, 0x00, 0x01, 0x02,     /* Chassis: MAC, 00:01:02:03:04:05 */
-                0x03, 0x04, 0x05,
-                0x04, 0x04, 0x05, 0x31, 0x2f, 0x33,     /* Port: interface name, "1/3" */
-                0x06, 0x02, 0x00, 0x78,                 /* TTL: 120 seconds */
-                /* LLDP optional TLVs */
-                0x08, 0x04, 0x50, 0x6f, 0x72, 0x74,     /* Port Description: "Port" */
-                0x0a, 0x03, 0x53, 0x59, 0x53,           /* System Name: "SYS" */
-                0x0c, 0x04, 0x66, 0x6f, 0x6f, 0x00,     /* System Description: "foo" (NULL-terminated) */
-                0x00, 0x00                              /* End Of LLDPDU */
-        };
-
-        sd_lldp *lldp;
-        sd_lldp_neighbor **neighbors;
-        uint8_t type;
-        const void *data;
-        uint16_t ttl;
-        size_t length;
-        const char *str;
-
-        lldp_handler_calls = 0;
-        assert_se(start_lldp(&lldp, e, lldp_handler, NULL) == 0);
-
-        assert_se(write(test_fd[1], frame, sizeof(frame)) == sizeof(frame));
-        sd_event_run(e, 0);
-        assert_se(lldp_handler_calls == 1);
-        assert_se(sd_lldp_get_neighbors(lldp, &neighbors) == 1);
-
-        assert_se(sd_lldp_neighbor_get_chassis_id(neighbors[0], &type, &data, &length) == 0);
-        assert_se(type == SD_LLDP_CHASSIS_SUBTYPE_MAC_ADDRESS);
-        assert_se(length == ETH_ALEN);
-        assert_se(!memcmp(data, "\x00\x01\x02\x03\x04\x05", ETH_ALEN));
-
-        assert_se(sd_lldp_neighbor_get_port_id(neighbors[0], &type, &data, &length) == 0);
-        assert_se(type == SD_LLDP_PORT_SUBTYPE_INTERFACE_NAME);
-        assert_se(length == 3);
-        assert_se(!memcmp(data, "1/3", 3));
-
-        assert_se(sd_lldp_neighbor_get_port_description(neighbors[0], &str) == 0);
-        assert_se(streq(str, "Port"));
-
-        assert_se(sd_lldp_neighbor_get_system_name(neighbors[0], &str) == 0);
-        assert_se(streq(str, "SYS"));
-
-        assert_se(sd_lldp_neighbor_get_system_description(neighbors[0], &str) == 0);
-        assert_se(streq(str, "foo"));
-
-        assert_se(sd_lldp_neighbor_get_ttl(neighbors[0], &ttl) == 0);
-        assert_se(ttl == 120);
-
-        sd_lldp_neighbor_unref(neighbors[0]);
-        free(neighbors);
-
-        assert_se(stop_lldp(lldp) == 0);
-}
-
-static void test_receive_incomplete_packet(sd_event *e) {
-        sd_lldp *lldp;
-        sd_lldp_neighbor **neighbors;
-        uint8_t frame[] = {
-                /* Ethernet header */
-                0x01, 0x80, 0xc2, 0x00, 0x00, 0x03,     /* Destination MAC */
-                0x01, 0x02, 0x03, 0x04, 0x05, 0x06,     /* Source MAC */
-                0x88, 0xcc,                             /* Ethertype */
-                /* LLDP mandatory TLVs */
-                0x02, 0x07, 0x04, 0x00, 0x01, 0x02,     /* Chassis: MAC, 00:01:02:03:04:05 */
-                0x03, 0x04, 0x05,
-                0x04, 0x04, 0x05, 0x31, 0x2f, 0x33,     /* Port: interface name, "1/3" */
-                                                        /* Missing TTL */
-                0x00, 0x00                              /* End Of LLDPDU */
-        };
-
-        lldp_handler_calls = 0;
-        assert_se(start_lldp(&lldp, e, lldp_handler, NULL) == 0);
-
-        assert_se(write(test_fd[1], frame, sizeof(frame)) == sizeof(frame));
-        sd_event_run(e, 0);
-        assert_se(lldp_handler_calls == 0);
-        assert_se(sd_lldp_get_neighbors(lldp, &neighbors) == 0);
-
-        assert_se(stop_lldp(lldp) == 0);
-}
-
-static void test_receive_oui_packet(sd_event *e) {
-        sd_lldp *lldp;
-        sd_lldp_neighbor **neighbors;
-        uint8_t frame[] = {
-                /* Ethernet header */
-                0x01, 0x80, 0xc2, 0x00, 0x00, 0x03,     /* Destination MAC */
-                0x01, 0x02, 0x03, 0x04, 0x05, 0x06,     /* Source MAC */
-                0x88, 0xcc,                             /* Ethertype */
-                /* LLDP mandatory TLVs */
-                0x02, 0x07, 0x04, 0x00, 0x01, 0x02,     /* Chassis: MAC, 00:01:02:03:04:05 */
-                0x03, 0x04, 0x05,
-                0x04, 0x04, 0x05, 0x31, 0x2f, 0x33,     /* Port TLV: interface name, "1/3" */
-                0x06, 0x02, 0x00, 0x78,                 /* TTL: 120 seconds */
-                /* LLDP optional TLVs */
-                0xfe, 0x06, 0x00, 0x80, 0xc2, 0x01,     /* Port VLAN ID: 0x1234 */
-                0x12, 0x34,
-                0xfe, 0x07, 0x00, 0x80, 0xc2, 0x02,     /* Port and protocol: flag 1, PPVID 0x7788 */
-                0x01, 0x77, 0x88,
-                0xfe, 0x0d, 0x00, 0x80, 0xc2, 0x03,     /* VLAN Name: ID 0x1234, name "Vlan51" */
-                0x12, 0x34, 0x06, 0x56, 0x6c, 0x61,
-                0x6e, 0x35, 0x31,
-                0xfe, 0x06, 0x00, 0x80, 0xc2, 0x06,     /* Management VID: 0x0102 */
-                0x01, 0x02,
-                0xfe, 0x09, 0x00, 0x80, 0xc2, 0x07,     /* Link aggregation: status 1, ID 0x00140012 */
-                0x01, 0x00, 0x14, 0x00, 0x12,
-                0xfe, 0x07, 0x00, 0x12, 0x0f, 0x02,     /* 802.3 Power via MDI: PSE, MDI enabled */
-                0x07, 0x01, 0x00,
-                0x00, 0x00                              /* End of LLDPDU */
-        };
-
-        lldp_handler_calls = 0;
-        assert_se(start_lldp(&lldp, e, lldp_handler, NULL) == 0);
-
-        assert_se(write(test_fd[1], frame, sizeof(frame)) == sizeof(frame));
-        sd_event_run(e, 0);
-        assert_se(lldp_handler_calls == 1);
-        assert_se(sd_lldp_get_neighbors(lldp, &neighbors) == 1);
-
-        assert_se(sd_lldp_neighbor_tlv_rewind(neighbors[0]) >= 0);
-        assert_se(sd_lldp_neighbor_tlv_is_type(neighbors[0], SD_LLDP_TYPE_CHASSIS_ID) > 0);
-        assert_se(sd_lldp_neighbor_tlv_next(neighbors[0]) > 0);
-        assert_se(sd_lldp_neighbor_tlv_is_type(neighbors[0], SD_LLDP_TYPE_PORT_ID) > 0);
-        assert_se(sd_lldp_neighbor_tlv_next(neighbors[0]) > 0);
-        assert_se(sd_lldp_neighbor_tlv_is_type(neighbors[0], SD_LLDP_TYPE_TTL) > 0);
-        assert_se(sd_lldp_neighbor_tlv_next(neighbors[0]) > 0);
-        assert_se(sd_lldp_neighbor_tlv_is_oui(neighbors[0], SD_LLDP_OUI_802_1, SD_LLDP_OUI_802_1_SUBTYPE_PORT_VLAN_ID) > 0);
-        assert_se(sd_lldp_neighbor_tlv_next(neighbors[0]) > 0);
-        assert_se(sd_lldp_neighbor_tlv_is_oui(neighbors[0], SD_LLDP_OUI_802_1, SD_LLDP_OUI_802_1_SUBTYPE_PORT_PROTOCOL_VLAN_ID) > 0);
-        assert_se(sd_lldp_neighbor_tlv_next(neighbors[0]) > 0);
-        assert_se(sd_lldp_neighbor_tlv_is_oui(neighbors[0], SD_LLDP_OUI_802_1, SD_LLDP_OUI_802_1_SUBTYPE_VLAN_NAME) > 0);
-        assert_se(sd_lldp_neighbor_tlv_next(neighbors[0]) > 0);
-        assert_se(sd_lldp_neighbor_tlv_is_oui(neighbors[0], SD_LLDP_OUI_802_1, SD_LLDP_OUI_802_1_SUBTYPE_MANAGEMENT_VID) > 0);
-        assert_se(sd_lldp_neighbor_tlv_next(neighbors[0]) > 0);
-        assert_se(sd_lldp_neighbor_tlv_is_oui(neighbors[0], SD_LLDP_OUI_802_1, SD_LLDP_OUI_802_1_SUBTYPE_LINK_AGGREGATION) > 0);
-        assert_se(sd_lldp_neighbor_tlv_next(neighbors[0]) > 0);
-        assert_se(sd_lldp_neighbor_tlv_is_oui(neighbors[0], SD_LLDP_OUI_802_3, SD_LLDP_OUI_802_3_SUBTYPE_POWER_VIA_MDI) > 0);
-        assert_se(sd_lldp_neighbor_tlv_next(neighbors[0]) > 0);
-        assert_se(sd_lldp_neighbor_tlv_is_type(neighbors[0], SD_LLDP_TYPE_END) > 0);
-        assert_se(sd_lldp_neighbor_tlv_next(neighbors[0]) == 0);
-
-        sd_lldp_neighbor_unref(neighbors[0]);
-        free(neighbors);
-
-        assert_se(stop_lldp(lldp) == 0);
-}
-
-static void test_multiple_neighbors_sorted(sd_event *e) {
-
-        static const uint8_t frame1[] = {
-                /* Ethernet header */
-                0x01, 0x80, 0xc2, 0x00, 0x00, 0x03,     /* Destination MAC */
-                0x01, 0x02, 0x03, 0x04, 0x05, 0x06,     /* Source MAC */
-                0x88, 0xcc,                             /* Ethertype */
-                /* LLDP mandatory TLVs */
-                0x02, 0x04, 0x01, '1', '/', '2',        /* Chassis component: "1/2" */
-                0x04, 0x04, 0x02, '2', '/', '3',        /* Port component: "2/3" */
-                0x06, 0x02, 0x00, 0x78,                 /* TTL: 120 seconds */
-                0x00, 0x00                              /* End Of LLDPDU */
-        };
-        static const uint8_t frame2[] = {
-                /* Ethernet header */
-                0x01, 0x80, 0xc2, 0x00, 0x00, 0x03,     /* Destination MAC */
-                0x01, 0x02, 0x03, 0x04, 0x05, 0x06,     /* Source MAC */
-                0x88, 0xcc,                             /* Ethertype */
-                /* LLDP mandatory TLVs */
-                0x02, 0x04, 0x01, '2', '/', '1',        /* Chassis component: "2/1" */
-                0x04, 0x04, 0x02, '1', '/', '3',        /* Port component: "1/3" */
-                0x06, 0x02, 0x00, 0x78,                 /* TTL: 120 seconds */
-                0x00, 0x00                              /* End Of LLDPDU */
-        };
-        static const uint8_t frame3[] = {
-                /* Ethernet header */
-                0x01, 0x80, 0xc2, 0x00, 0x00, 0x03,     /* Destination MAC */
-                0x01, 0x02, 0x03, 0x04, 0x05, 0x06,     /* Source MAC */
-                0x88, 0xcc,                             /* Ethertype */
-                /* LLDP mandatory TLVs */
-                0x02, 0x05, 0x01, '2', '/', '1', '0',   /* Chassis component: "2/10" */
-                0x04, 0x04, 0x02, '1', '/', '0',        /* Port component: "1/0" */
-                0x06, 0x02, 0x00, 0x78,                 /* TTL: 120 seconds */
-                0x00, 0x00                              /* End Of LLDPDU */
-        };
-        static const uint8_t frame4[] = {
-                /* Ethernet header */
-                0x01, 0x80, 0xc2, 0x00, 0x00, 0x03,     /* Destination MAC */
-                0x01, 0x02, 0x03, 0x04, 0x05, 0x06,     /* Source MAC */
-                0x88, 0xcc,                             /* Ethertype */
-                /* LLDP mandatory TLVs */
-                0x02, 0x05, 0x01, '2', '/', '1', '9',   /* Chassis component: "2/19" */
-                0x04, 0x04, 0x02, '1', '/', '0',        /* Port component: "1/0" */
-                0x06, 0x02, 0x00, 0x78,                 /* TTL: 120 seconds */
-                0x00, 0x00                              /* End Of LLDPDU */
-        };
-        static const uint8_t frame5[] = {
-                /* Ethernet header */
-                0x01, 0x80, 0xc2, 0x00, 0x00, 0x03,     /* Destination MAC */
-                0x01, 0x02, 0x03, 0x04, 0x05, 0x06,     /* Source MAC */
-                0x88, 0xcc,                             /* Ethertype */
-                /* LLDP mandatory TLVs */
-                0x02, 0x04, 0x01, '1', '/', '2',        /* Chassis component: "1/2" */
-                0x04, 0x05, 0x02, '2', '/', '1', '0',   /* Port component: "2/10" */
-                0x06, 0x02, 0x00, 0x78,                 /* TTL: 120 seconds */
-                0x00, 0x00                              /* End Of LLDPDU */
-        };
-        static const uint8_t frame6[] = {
-                /* Ethernet header */
-                0x01, 0x80, 0xc2, 0x00, 0x00, 0x03,     /* Destination MAC */
-                0x01, 0x02, 0x03, 0x04, 0x05, 0x06,     /* Source MAC */
-                0x88, 0xcc,                             /* Ethertype */
-                /* LLDP mandatory TLVs */
-                0x02, 0x04, 0x01, '1', '/', '2',        /* Chassis component: "1/2" */
-                0x04, 0x05, 0x02, '2', '/', '3', '9',   /* Port component: "2/10" */
-                0x06, 0x02, 0x00, 0x78,                 /* TTL: 120 seconds */
-                0x00, 0x00                              /* End Of LLDPDU */
-        };
-        static const char* expected[] = {
-                /* ordered pairs of Chassis+Port */
-                "1/2", "2/10",
-                "1/2", "2/3",
-                "1/2", "2/39",
-                "2/1", "1/3",
-                "2/10", "1/0",
-                "2/19", "1/0",
-        };
-
-        sd_lldp *lldp;
-        sd_lldp_neighbor **neighbors;
-        int i;
-        uint8_t type;
-        const void *data;
-        size_t length, expected_length;
-        uint16_t ttl;
-
-        lldp_handler_calls = 0;
-        assert_se(start_lldp(&lldp, e, lldp_handler, NULL) == 0);
-
-        assert_se(write(test_fd[1], frame1, sizeof(frame1)) == sizeof(frame1));
-        sd_event_run(e, 0);
-        assert_se(write(test_fd[1], frame2, sizeof(frame2)) == sizeof(frame2));
-        sd_event_run(e, 0);
-        assert_se(write(test_fd[1], frame3, sizeof(frame3)) == sizeof(frame3));
-        sd_event_run(e, 0);
-        assert_se(write(test_fd[1], frame4, sizeof(frame4)) == sizeof(frame4));
-        sd_event_run(e, 0);
-        assert_se(write(test_fd[1], frame5, sizeof(frame5)) == sizeof(frame5));
-        sd_event_run(e, 0);
-        assert_se(write(test_fd[1], frame6, sizeof(frame6)) == sizeof(frame6));
-        sd_event_run(e, 0);
-        assert_se(lldp_handler_calls == 6);
-
-        assert_se(sd_lldp_get_neighbors(lldp, &neighbors) == 6);
-
-        for (i = 0; i < 6; i++) {
-                assert_se(sd_lldp_neighbor_get_chassis_id(neighbors[i], &type, &data, &length) == 0);
-                assert_se(type == SD_LLDP_CHASSIS_SUBTYPE_CHASSIS_COMPONENT);
-                expected_length = strlen(expected[2 * i]);
-                assert_se(length == expected_length);
-                assert_se(memcmp(data, expected[2 * i], expected_length) == 0);
-
-                assert_se(sd_lldp_neighbor_get_port_id(neighbors[i], &type, &data, &length) == 0);
-                assert_se(type == SD_LLDP_PORT_SUBTYPE_PORT_COMPONENT);
-                expected_length = strlen(expected[2 * i + 1]);
-                assert_se(length == expected_length);
-                assert_se(memcmp(data, expected[2 * i + 1], expected_length) == 0);
-
-                assert_se(sd_lldp_neighbor_get_ttl(neighbors[i], &ttl) == 0);
-                assert_se(ttl == 120);
-        }
-
-        for (i = 0; i < 6; i++)
-                sd_lldp_neighbor_unref(neighbors[i]);
-        free(neighbors);
-
-        assert_se(stop_lldp(lldp) == 0);
-}
-
-int main(int argc, char *argv[]) {
-        _cleanup_(sd_event_unrefp) sd_event *e = NULL;
-
-        test_setup_logging(LOG_DEBUG);
-
-        /* LLDP reception tests */
-        assert_se(sd_event_new(&e) == 0);
-        test_receive_basic_packet(e);
-        test_receive_incomplete_packet(e);
-        test_receive_oui_packet(e);
-        test_multiple_neighbors_sorted(e);
-
-        return 0;
-}
diff --git a/src/libsystemd/libsystemd.sym b/src/libsystemd/libsystemd.sym
index 5ec42e0f1f..48021b86d3 100644
--- a/src/libsystemd/libsystemd.sym
+++ b/src/libsystemd/libsystemd.sym
@@ -681,4 +681,45 @@ LIBSYSTEMD_243 {
 global:
         sd_bus_object_vtable_format;
         sd_event_source_disable_unref;
+
+        sd_lldp_new;
+        sd_lldp_ref;
+        sd_lldp_unref;
+        sd_lldp_start;
+        sd_lldp_stop;
+        sd_lldp_attach_event;
+        sd_lldp_detach_event;
+        sd_lldp_get_event;
+        sd_lldp_set_callback;
+        sd_lldp_set_ifindex;
+        sd_lldp_set_neighbors_max;
+        sd_lldp_match_capabilities;
+        sd_lldp_set_filter_address;
+        sd_lldp_get_neighbors;
+        sd_lldp_neighbor_from_raw;
+        sd_lldp_neighbor_ref;
+        sd_lldp_neighbor_unref;
+        sd_lldp_neighbor_get_source_address;
+        sd_lldp_neighbor_get_destination_address;
+        sd_lldp_neighbor_get_timestamp;
+        sd_lldp_neighbor_get_raw;
+        sd_lldp_neighbor_get_chassis_id;
+        sd_lldp_neighbor_get_chassis_id_as_string;
+        sd_lldp_neighbor_get_port_id;
+        sd_lldp_neighbor_get_port_id_as_string;
+        sd_lldp_neighbor_get_ttl;
+        sd_lldp_neighbor_get_system_name;
+        sd_lldp_neighbor_get_system_description;
+        sd_lldp_neighbor_get_port_description;
+        sd_lldp_neighbor_get_mud_url;
+        sd_lldp_neighbor_get_system_capabilities;
+        sd_lldp_neighbor_get_enabled_capabilities;
+        sd_lldp_neighbor_tlv_rewind;
+        sd_lldp_neighbor_tlv_next;
+        sd_lldp_neighbor_tlv_get_type;
+        sd_lldp_neighbor_tlv_is_type;
+        sd_lldp_neighbor_tlv_get_oui;
+        sd_lldp_neighbor_tlv_is_oui;
+        sd_lldp_neighbor_tlv_get_raw;
+
 } LIBSYSTEMD_241;
diff --git a/src/libsystemd/meson.build b/src/libsystemd/meson.build
index 77fe6e780f..e60853959f 100644
--- a/src/libsystemd/meson.build
+++ b/src/libsystemd/meson.build
@@ -70,6 +70,12 @@ libsystemd_sources = files('''
         sd-hwdb/hwdb-util.c
         sd-hwdb/hwdb-util.h
         sd-hwdb/sd-hwdb.c
+        sd-lldp/sd-lldp.c
+        sd-lldp/lldp-internal.h
+        sd-lldp/lldp-neighbor.c
+        sd-lldp/lldp-neighbor.h
+        sd-lldp/lldp-network.c
+        sd-lldp/lldp-network.h
         sd-netlink/generic-netlink.c
         sd-netlink/netlink-internal.h
         sd-netlink/netlink-message.c
diff --git a/src/libsystemd/sd-lldp/lldp-internal.h b/src/libsystemd/sd-lldp/lldp-internal.h
new file mode 100644
index 0000000000..9598438dba
--- /dev/null
+++ b/src/libsystemd/sd-lldp/lldp-internal.h
@@ -0,0 +1,39 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+#pragma once
+
+#include "sd-event.h"
+#include "sd-lldp.h"
+
+#include "hashmap.h"
+#include "log.h"
+#include "prioq.h"
+
+struct sd_lldp {
+        unsigned n_ref;
+
+        int ifindex;
+        int fd;
+
+        sd_event *event;
+        int64_t event_priority;
+        sd_event_source *io_event_source;
+        sd_event_source *timer_event_source;
+
+        Prioq *neighbor_by_expiry;
+        Hashmap *neighbor_by_id;
+
+        uint64_t neighbors_max;
+
+        sd_lldp_callback_t callback;
+        void *userdata;
+
+        uint16_t capability_mask;
+
+        struct ether_addr filter_address;
+};
+
+#define log_lldp_errno(error, fmt, ...) log_internal(LOG_DEBUG, error, PROJECT_FILE, __LINE__, __func__, "LLDP: " fmt, ##__VA_ARGS__)
+#define log_lldp(fmt, ...) log_lldp_errno(0, fmt, ##__VA_ARGS__)
+
+const char* lldp_event_to_string(sd_lldp_event e) _const_;
+sd_lldp_event lldp_event_from_string(const char *s) _pure_;
diff --git a/src/libsystemd/sd-lldp/lldp-neighbor.c b/src/libsystemd/sd-lldp/lldp-neighbor.c
new file mode 100644
index 0000000000..9bae4a3c6e
--- /dev/null
+++ b/src/libsystemd/sd-lldp/lldp-neighbor.c
@@ -0,0 +1,769 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include "alloc-util.h"
+#include "escape.h"
+#include "ether-addr-util.h"
+#include "hexdecoct.h"
+#include "in-addr-util.h"
+#include "lldp-internal.h"
+#include "lldp-neighbor.h"
+#include "memory-util.h"
+#include "missing.h"
+#include "unaligned.h"
+
+static void lldp_neighbor_id_hash_func(const LLDPNeighborID *id, struct siphash *state) {
+        siphash24_compress(id->chassis_id, id->chassis_id_size, state);
+        siphash24_compress(&id->chassis_id_size, sizeof(id->chassis_id_size), state);
+        siphash24_compress(id->port_id, id->port_id_size, state);
+        siphash24_compress(&id->port_id_size, sizeof(id->port_id_size), state);
+}
+
+int lldp_neighbor_id_compare_func(const LLDPNeighborID *x, const LLDPNeighborID *y) {
+        return memcmp_nn(x->chassis_id, x->chassis_id_size, y->chassis_id, y->chassis_id_size)
+            ?: memcmp_nn(x->port_id, x->port_id_size, y->port_id, y->port_id_size);
+}
+
+DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR(lldp_neighbor_hash_ops, LLDPNeighborID, lldp_neighbor_id_hash_func, lldp_neighbor_id_compare_func,
+                                      sd_lldp_neighbor, lldp_neighbor_unlink);
+
+int lldp_neighbor_prioq_compare_func(const void *a, const void *b) {
+        const sd_lldp_neighbor *x = a, *y = b;
+
+        return CMP(x->until, y->until);
+}
+
+_public_ sd_lldp_neighbor *sd_lldp_neighbor_ref(sd_lldp_neighbor *n) {
+        if (!n)
+                return NULL;
+
+        assert(n->n_ref > 0 || n->lldp);
+        n->n_ref++;
+
+        return n;
+}
+
+static void lldp_neighbor_free(sd_lldp_neighbor *n) {
+        assert(n);
+
+        free(n->id.port_id);
+        free(n->id.chassis_id);
+        free(n->port_description);
+        free(n->system_name);
+        free(n->system_description);
+        free(n->chassis_id_as_string);
+        free(n->port_id_as_string);
+        free(n);
+}
+
+_public_ sd_lldp_neighbor *sd_lldp_neighbor_unref(sd_lldp_neighbor *n) {
+
+        /* Drops one reference from the neighbor. Note that the object is not freed unless it is already unlinked from
+         * the sd_lldp object. */
+
+        if (!n)
+                return NULL;
+
+        assert(n->n_ref > 0);
+        n->n_ref--;
+
+        if (n->n_ref <= 0 && !n->lldp)
+                lldp_neighbor_free(n);
+
+        return NULL;
+}
+
+sd_lldp_neighbor *lldp_neighbor_unlink(sd_lldp_neighbor *n) {
+
+        /* Removes the neighbor object from the LLDP object, and frees it if it also has no other reference. */
+
+        if (!n)
+                return NULL;
+
+        if (!n->lldp)
+                return NULL;
+
+        /* Only remove the neighbor object from the hash table if it's in there, don't complain if it isn't. This is
+         * because we are used as destructor call for hashmap_clear() and thus sometimes are called to de-register
+         * ourselves from the hashtable and sometimes are called after we already are de-registered. */
+
+        (void) hashmap_remove_value(n->lldp->neighbor_by_id, &n->id, n);
+
+        assert_se(prioq_remove(n->lldp->neighbor_by_expiry, n, &n->prioq_idx) >= 0);
+
+        n->lldp = NULL;
+
+        if (n->n_ref <= 0)
+                lldp_neighbor_free(n);
+
+        return NULL;
+}
+
+sd_lldp_neighbor *lldp_neighbor_new(size_t raw_size) {
+        sd_lldp_neighbor *n;
+
+        n = malloc0(ALIGN(sizeof(sd_lldp_neighbor)) + raw_size);
+        if (!n)
+                return NULL;
+
+        n->raw_size = raw_size;
+        n->n_ref = 1;
+
+        return n;
+}
+
+static int parse_string(char **s, const void *q, size_t n) {
+        const char *p = q;
+        char *k;
+
+        assert(s);
+        assert(p || n == 0);
+
+        if (*s) {
+                log_lldp("Found duplicate string, ignoring field.");
+                return 0;
+        }
+
+        /* Strip trailing NULs, just to be nice */
+        while (n > 0 && p[n-1] == 0)
+                n--;
+
+        if (n <= 0) /* Ignore empty strings */
+                return 0;
+
+        /* Look for inner NULs */
+        if (memchr(p, 0, n)) {
+                log_lldp("Found inner NUL in string, ignoring field.");
+                return 0;
+        }
+
+        /* Let's escape weird chars, for security reasons */
+        k = cescape_length(p, n);
+        if (!k)
+                return -ENOMEM;
+
+        free(*s);
+        *s = k;
+
+        return 1;
+}
+
+int lldp_neighbor_parse(sd_lldp_neighbor *n) {
+        struct ether_header h;
+        const uint8_t *p;
+        size_t left;
+        int r;
+
+        assert(n);
+
+        if (n->raw_size < sizeof(struct ether_header)) {
+                log_lldp("Received truncated packet, ignoring.");
+                return -EBADMSG;
+        }
+
+        memcpy(&h, LLDP_NEIGHBOR_RAW(n), sizeof(h));
+
+        if (h.ether_type != htobe16(ETHERTYPE_LLDP)) {
+                log_lldp("Received packet with wrong type, ignoring.");
+                return -EBADMSG;
+        }
+
+        if (h.ether_dhost[0] != 0x01 ||
+            h.ether_dhost[1] != 0x80 ||
+            h.ether_dhost[2] != 0xc2 ||
+            h.ether_dhost[3] != 0x00 ||
+            h.ether_dhost[4] != 0x00 ||
+            !IN_SET(h.ether_dhost[5], 0x00, 0x03, 0x0e)) {
+                log_lldp("Received packet with wrong destination address, ignoring.");
+                return -EBADMSG;
+        }
+
+        memcpy(&n->source_address, h.ether_shost, sizeof(struct ether_addr));
+        memcpy(&n->destination_address, h.ether_dhost, sizeof(struct ether_addr));
+
+        p = (const uint8_t*) LLDP_NEIGHBOR_RAW(n) + sizeof(struct ether_header);
+        left = n->raw_size - sizeof(struct ether_header);
+
+        for (;;) {
+                uint8_t type;
+                uint16_t length;
+
+                if (left < 2) {
+                        log_lldp("TLV lacks header, ignoring.");
+                        return -EBADMSG;
+                }
+
+                type = p[0] >> 1;
+                length = p[1] + (((uint16_t) (p[0] & 1)) << 8);
+                p += 2, left -= 2;
+
+                if (left < length) {
+                        log_lldp("TLV truncated, ignoring datagram.");
+                        return -EBADMSG;
+                }
+
+                switch (type) {
+
+                case SD_LLDP_TYPE_END:
+                        if (length != 0) {
+                                log_lldp("End marker TLV not zero-sized, ignoring datagram.");
+                                return -EBADMSG;
+                        }
+
+                        /* Note that after processing the SD_LLDP_TYPE_END left could still be > 0
+                         * as the message may contain padding (see IEEE 802.1AB-2016, sec. 8.5.12) */
+
+                        goto end_marker;
+
+                case SD_LLDP_TYPE_CHASSIS_ID:
+                        if (length < 2 || length > 256) { /* includes the chassis subtype, hence one extra byte */
+                                log_lldp("Chassis ID field size out of range, ignoring datagram.");
+                                return -EBADMSG;
+                        }
+                        if (n->id.chassis_id) {
+                                log_lldp("Duplicate chassis ID field, ignoring datagram.");
+                                return -EBADMSG;
+                        }
+
+                        n->id.chassis_id = memdup(p, length);
+                        if (!n->id.chassis_id)
+                                return -ENOMEM;
+
+                        n->id.chassis_id_size = length;
+                        break;
+
+                case SD_LLDP_TYPE_PORT_ID:
+                        if (length < 2 || length > 256) { /* includes the port subtype, hence one extra byte */
+                                log_lldp("Port ID field size out of range, ignoring datagram.");
+                                return -EBADMSG;
+                        }
+                        if (n->id.port_id) {
+                                log_lldp("Duplicate port ID field, ignoring datagram.");
+                                return -EBADMSG;
+                        }
+
+                        n->id.port_id = memdup(p, length);
+                        if (!n->id.port_id)
+                                return -ENOMEM;
+
+                        n->id.port_id_size = length;
+                        break;
+
+                case SD_LLDP_TYPE_TTL:
+                        if (length != 2) {
+                                log_lldp("TTL field has wrong size, ignoring datagram.");
+                                return -EBADMSG;
+                        }
+
+                        if (n->has_ttl) {
+                                log_lldp("Duplicate TTL field, ignoring datagram.");
+                                return -EBADMSG;
+                        }
+
+                        n->ttl = unaligned_read_be16(p);
+                        n->has_ttl = true;
+                        break;
+
+                case SD_LLDP_TYPE_PORT_DESCRIPTION:
+                        r = parse_string(&n->port_description, p, length);
+                        if (r < 0)
+                                return r;
+                        break;
+
+                case SD_LLDP_TYPE_SYSTEM_NAME:
+                        r = parse_string(&n->system_name, p, length);
+                        if (r < 0)
+                                return r;
+                        break;
+
+                case SD_LLDP_TYPE_SYSTEM_DESCRIPTION:
+                        r = parse_string(&n->system_description, p, length);
+                        if (r < 0)
+                                return r;
+                        break;
+
+                case SD_LLDP_TYPE_SYSTEM_CAPABILITIES:
+                        if (length != 4)
+                                log_lldp("System capabilities field has wrong size, ignoring.");
+                        else {
+                                n->system_capabilities = unaligned_read_be16(p);
+                                n->enabled_capabilities = unaligned_read_be16(p + 2);
+                                n->has_capabilities = true;
+                        }
+
+                        break;
+
+                case SD_LLDP_TYPE_PRIVATE:
+                        if (length < 4)
+                                log_lldp("Found private TLV that is too short, ignoring.");
+
+                        break;
+                }
+
+                p += length, left -= length;
+        }
+
+end_marker:
+        if (!n->id.chassis_id || !n->id.port_id || !n->has_ttl) {
+                log_lldp("One or more mandatory TLV missing in datagram. Ignoring.");
+                return -EBADMSG;
+
+        }
+
+        n->rindex = sizeof(struct ether_header);
+
+        return 0;
+}
+
+void lldp_neighbor_start_ttl(sd_lldp_neighbor *n) {
+        assert(n);
+
+        if (n->ttl > 0) {
+                usec_t base;
+
+                /* Use the packet's timestamp if there is one known */
+                base = triple_timestamp_by_clock(&n->timestamp, clock_boottime_or_monotonic());
+                if (base <= 0 || base == USEC_INFINITY)
+                        base = now(clock_boottime_or_monotonic()); /* Otherwise, take the current time */
+
+                n->until = usec_add(base, n->ttl * USEC_PER_SEC);
+        } else
+                n->until = 0;
+
+        if (n->lldp)
+                prioq_reshuffle(n->lldp->neighbor_by_expiry, n, &n->prioq_idx);
+}
+
+bool lldp_neighbor_equal(const sd_lldp_neighbor *a, const sd_lldp_neighbor *b) {
+        if (a == b)
+                return true;
+
+        if (!a || !b)
+                return false;
+
+        if (a->raw_size != b->raw_size)
+                return false;
+
+        return memcmp(LLDP_NEIGHBOR_RAW(a), LLDP_NEIGHBOR_RAW(b), a->raw_size) == 0;
+}
+
+_public_ int sd_lldp_neighbor_get_source_address(sd_lldp_neighbor *n, struct ether_addr* address) {
+        assert_return(n, -EINVAL);
+        assert_return(address, -EINVAL);
+
+        *address = n->source_address;
+        return 0;
+}
+
+_public_ int sd_lldp_neighbor_get_destination_address(sd_lldp_neighbor *n, struct ether_addr* address) {
+        assert_return(n, -EINVAL);
+        assert_return(address, -EINVAL);
+
+        *address = n->destination_address;
+        return 0;
+}
+
+_public_ int sd_lldp_neighbor_get_raw(sd_lldp_neighbor *n, const void **ret, size_t *size) {
+        assert_return(n, -EINVAL);
+        assert_return(ret, -EINVAL);
+        assert_return(size, -EINVAL);
+
+        *ret = LLDP_NEIGHBOR_RAW(n);
+        *size = n->raw_size;
+
+        return 0;
+}
+
+_public_ int sd_lldp_neighbor_get_chassis_id(sd_lldp_neighbor *n, uint8_t *type, const void **ret, size_t *size) {
+        assert_return(n, -EINVAL);
+        assert_return(type, -EINVAL);
+        assert_return(ret, -EINVAL);
+        assert_return(size, -EINVAL);
+
+        assert(n->id.chassis_id_size > 0);
+
+        *type = *(uint8_t*) n->id.chassis_id;
+        *ret = (uint8_t*) n->id.chassis_id + 1;
+        *size = n->id.chassis_id_size - 1;
+
+        return 0;
+}
+
+static int format_mac_address(const void *data, size_t sz, char **ret) {
+        struct ether_addr a;
+        char *k;
+
+        assert(data || sz <= 0);
+
+        if (sz != 7)
+                return 0;
+
+        memcpy(&a, (uint8_t*) data + 1, sizeof(a));
+
+        k = new(char, ETHER_ADDR_TO_STRING_MAX);
+        if (!k)
+                return -ENOMEM;
+
+        *ret = ether_addr_to_string(&a, k);
+        return 1;
+}
+
+static int format_network_address(const void *data, size_t sz, char **ret) {
+        union in_addr_union a;
+        int family, r;
+
+        if (sz == 6 && ((uint8_t*) data)[1] == 1) {
+                memcpy(&a.in, (uint8_t*) data + 2, sizeof(a.in));
+                family = AF_INET;
+        } else if (sz == 18 && ((uint8_t*) data)[1] == 2) {
+                memcpy(&a.in6, (uint8_t*) data + 2, sizeof(a.in6));
+                family = AF_INET6;
+        } else
+                return 0;
+
+        r = in_addr_to_string(family, &a, ret);
+        if (r < 0)
+                return r;
+        return 1;
+}
+
+_public_ int sd_lldp_neighbor_get_chassis_id_as_string(sd_lldp_neighbor *n, const char **ret) {
+        char *k;
+        int r;
+
+        assert_return(n, -EINVAL);
+        assert_return(ret, -EINVAL);
+
+        if (n->chassis_id_as_string) {
+                *ret = n->chassis_id_as_string;
+                return 0;
+        }
+
+        assert(n->id.chassis_id_size > 0);
+
+        switch (*(uint8_t*) n->id.chassis_id) {
+
+        case SD_LLDP_CHASSIS_SUBTYPE_CHASSIS_COMPONENT:
+        case SD_LLDP_CHASSIS_SUBTYPE_INTERFACE_ALIAS:
+        case SD_LLDP_CHASSIS_SUBTYPE_PORT_COMPONENT:
+        case SD_LLDP_CHASSIS_SUBTYPE_INTERFACE_NAME:
+        case SD_LLDP_CHASSIS_SUBTYPE_LOCALLY_ASSIGNED:
+                k = cescape_length((char*) n->id.chassis_id + 1, n->id.chassis_id_size - 1);
+                if (!k)
+                        return -ENOMEM;
+
+                goto done;
+
+        case SD_LLDP_CHASSIS_SUBTYPE_MAC_ADDRESS:
+                r = format_mac_address(n->id.chassis_id, n->id.chassis_id_size, &k);
+                if (r < 0)
+                        return r;
+                if (r > 0)
+                        goto done;
+
+                break;
+
+        case SD_LLDP_CHASSIS_SUBTYPE_NETWORK_ADDRESS:
+                r = format_network_address(n->id.chassis_id, n->id.chassis_id_size, &k);
+                if (r < 0)
+                        return r;
+                if (r > 0)
+                        goto done;
+
+                break;
+        }
+
+        /* Generic fallback */
+        k = hexmem(n->id.chassis_id, n->id.chassis_id_size);
+        if (!k)
+                return -ENOMEM;
+
+done:
+        *ret = n->chassis_id_as_string = k;
+        return 0;
+}
+
+_public_ int sd_lldp_neighbor_get_port_id(sd_lldp_neighbor *n, uint8_t *type, const void **ret, size_t *size) {
+        assert_return(n, -EINVAL);
+        assert_return(type, -EINVAL);
+        assert_return(ret, -EINVAL);
+        assert_return(size, -EINVAL);
+
+        assert(n->id.port_id_size > 0);
+
+        *type = *(uint8_t*) n->id.port_id;
+        *ret = (uint8_t*) n->id.port_id + 1;
+        *size = n->id.port_id_size - 1;
+
+        return 0;
+}
+
+_public_ int sd_lldp_neighbor_get_port_id_as_string(sd_lldp_neighbor *n, const char **ret) {
+        char *k;
+        int r;
+
+        assert_return(n, -EINVAL);
+        assert_return(ret, -EINVAL);
+
+        if (n->port_id_as_string) {
+                *ret = n->port_id_as_string;
+                return 0;
+        }
+
+        assert(n->id.port_id_size > 0);
+
+        switch (*(uint8_t*) n->id.port_id) {
+
+        case SD_LLDP_PORT_SUBTYPE_INTERFACE_ALIAS:
+        case SD_LLDP_PORT_SUBTYPE_PORT_COMPONENT:
+        case SD_LLDP_PORT_SUBTYPE_INTERFACE_NAME:
+        case SD_LLDP_PORT_SUBTYPE_LOCALLY_ASSIGNED:
+                k = cescape_length((char*) n->id.port_id + 1, n->id.port_id_size - 1);
+                if (!k)
+                        return -ENOMEM;
+
+                goto done;
+
+        case SD_LLDP_PORT_SUBTYPE_MAC_ADDRESS:
+                r = format_mac_address(n->id.port_id, n->id.port_id_size, &k);
+                if (r < 0)
+                        return r;
+                if (r > 0)
+                        goto done;
+
+                break;
+
+        case SD_LLDP_PORT_SUBTYPE_NETWORK_ADDRESS:
+                r = format_network_address(n->id.port_id, n->id.port_id_size, &k);
+                if (r < 0)
+                        return r;
+                if (r > 0)
+                        goto done;
+
+                break;
+        }
+
+        /* Generic fallback */
+        k = hexmem(n->id.port_id, n->id.port_id_size);
+        if (!k)
+                return -ENOMEM;
+
+done:
+        *ret = n->port_id_as_string = k;
+        return 0;
+}
+
+_public_ int sd_lldp_neighbor_get_ttl(sd_lldp_neighbor *n, uint16_t *ret_sec) {
+        assert_return(n, -EINVAL);
+        assert_return(ret_sec, -EINVAL);
+
+        *ret_sec = n->ttl;
+        return 0;
+}
+
+_public_ int sd_lldp_neighbor_get_system_name(sd_lldp_neighbor *n, const char **ret) {
+        assert_return(n, -EINVAL);
+        assert_return(ret, -EINVAL);
+
+        if (!n->system_name)
+                return -ENODATA;
+
+        *ret = n->system_name;
+        return 0;
+}
+
+_public_ int sd_lldp_neighbor_get_system_description(sd_lldp_neighbor *n, const char **ret) {
+        assert_return(n, -EINVAL);
+        assert_return(ret, -EINVAL);
+
+        if (!n->system_description)
+                return -ENODATA;
+
+        *ret = n->system_description;
+        return 0;
+}
+
+_public_ int sd_lldp_neighbor_get_port_description(sd_lldp_neighbor *n, const char **ret) {
+        assert_return(n, -EINVAL);
+        assert_return(ret, -EINVAL);
+
+        if (!n->port_description)
+                return -ENODATA;
+
+        *ret = n->port_description;
+        return 0;
+}
+
+_public_ int sd_lldp_neighbor_get_system_capabilities(sd_lldp_neighbor *n, uint16_t *ret) {
+        assert_return(n, -EINVAL);
+        assert_return(ret, -EINVAL);
+
+        if (!n->has_capabilities)
+                return -ENODATA;
+
+        *ret = n->system_capabilities;
+        return 0;
+}
+
+_public_ int sd_lldp_neighbor_get_enabled_capabilities(sd_lldp_neighbor *n, uint16_t *ret) {
+        assert_return(n, -EINVAL);
+        assert_return(ret, -EINVAL);
+
+        if (!n->has_capabilities)
+                return -ENODATA;
+
+        *ret = n->enabled_capabilities;
+        return 0;
+}
+
+_public_ int sd_lldp_neighbor_from_raw(sd_lldp_neighbor **ret, const void *raw, size_t raw_size) {
+        _cleanup_(sd_lldp_neighbor_unrefp) sd_lldp_neighbor *n = NULL;
+        int r;
+
+        assert_return(ret, -EINVAL);
+        assert_return(raw || raw_size <= 0, -EINVAL);
+
+        n = lldp_neighbor_new(raw_size);
+        if (!n)
+                return -ENOMEM;
+
+        memcpy(LLDP_NEIGHBOR_RAW(n), raw, raw_size);
+        r = lldp_neighbor_parse(n);
+        if (r < 0)
+                return r;
+
+        *ret = TAKE_PTR(n);
+
+        return r;
+}
+
+_public_ int sd_lldp_neighbor_tlv_rewind(sd_lldp_neighbor *n) {
+        assert_return(n, -EINVAL);
+
+        assert(n->raw_size >= sizeof(struct ether_header));
+        n->rindex = sizeof(struct ether_header);
+
+        return n->rindex < n->raw_size;
+}
+
+_public_ int sd_lldp_neighbor_tlv_next(sd_lldp_neighbor *n) {
+        size_t length;
+
+        assert_return(n, -EINVAL);
+
+        if (n->rindex == n->raw_size) /* EOF */
+                return -ESPIPE;
+
+        if (n->rindex + 2 > n->raw_size) /* Truncated message */
+                return -EBADMSG;
+
+        length = LLDP_NEIGHBOR_TLV_LENGTH(n);
+        if (n->rindex + 2 + length > n->raw_size)
+                return -EBADMSG;
+
+        n->rindex += 2 + length;
+        return n->rindex < n->raw_size;
+}
+
+_public_ int sd_lldp_neighbor_tlv_get_type(sd_lldp_neighbor *n, uint8_t *type) {
+        assert_return(n, -EINVAL);
+        assert_return(type, -EINVAL);
+
+        if (n->rindex == n->raw_size) /* EOF */
+                return -ESPIPE;
+
+        if (n->rindex + 2 > n->raw_size)
+                return -EBADMSG;
+
+        *type = LLDP_NEIGHBOR_TLV_TYPE(n);
+        return 0;
+}
+
+_public_ int sd_lldp_neighbor_tlv_is_type(sd_lldp_neighbor *n, uint8_t type) {
+        uint8_t k;
+        int r;
+
+        assert_return(n, -EINVAL);
+
+        r = sd_lldp_neighbor_tlv_get_type(n, &k);
+        if (r < 0)
+                return r;
+
+        return type == k;
+}
+
+_public_ int sd_lldp_neighbor_tlv_get_oui(sd_lldp_neighbor *n, uint8_t oui[_SD_ARRAY_STATIC 3], uint8_t *subtype) {
+        const uint8_t *d;
+        size_t length;
+        int r;
+
+        assert_return(n, -EINVAL);
+        assert_return(oui, -EINVAL);
+        assert_return(subtype, -EINVAL);
+
+        r = sd_lldp_neighbor_tlv_is_type(n, SD_LLDP_TYPE_PRIVATE);
+        if (r < 0)
+                return r;
+        if (r == 0)
+                return -ENXIO;
+
+        length = LLDP_NEIGHBOR_TLV_LENGTH(n);
+        if (length < 4)
+                return -EBADMSG;
+
+        if (n->rindex + 2 + length > n->raw_size)
+                return -EBADMSG;
+
+        d = LLDP_NEIGHBOR_TLV_DATA(n);
+        memcpy(oui, d, 3);
+        *subtype = d[3];
+
+        return 0;
+}
+
+_public_ int sd_lldp_neighbor_tlv_is_oui(sd_lldp_neighbor *n, const uint8_t oui[_SD_ARRAY_STATIC 3], uint8_t subtype) {
+        uint8_t k[3], st;
+        int r;
+
+        r = sd_lldp_neighbor_tlv_get_oui(n, k, &st);
+        if (r == -ENXIO)
+                return 0;
+        if (r < 0)
+                return r;
+
+        return memcmp(k, oui, 3) == 0 && st == subtype;
+}
+
+_public_ int sd_lldp_neighbor_tlv_get_raw(sd_lldp_neighbor *n, const void **ret, size_t *size) {
+        size_t length;
+
+        assert_return(n, -EINVAL);
+        assert_return(ret, -EINVAL);
+        assert_return(size, -EINVAL);
+
+        /* Note that this returns the full TLV, including the TLV header */
+
+        if (n->rindex + 2 > n->raw_size)
+                return -EBADMSG;
+
+        length = LLDP_NEIGHBOR_TLV_LENGTH(n);
+        if (n->rindex + 2 + length > n->raw_size)
+                return -EBADMSG;
+
+        *ret = (uint8_t*) LLDP_NEIGHBOR_RAW(n) + n->rindex;
+        *size = length + 2;
+
+        return 0;
+}
+
+_public_ int sd_lldp_neighbor_get_timestamp(sd_lldp_neighbor *n, clockid_t clock, uint64_t *ret) {
+        assert_return(n, -EINVAL);
+        assert_return(TRIPLE_TIMESTAMP_HAS_CLOCK(clock), -EOPNOTSUPP);
+        assert_return(clock_supported(clock), -EOPNOTSUPP);
+        assert_return(ret, -EINVAL);
+
+        if (!triple_timestamp_is_set(&n->timestamp))
+                return -ENODATA;
+
+        *ret = triple_timestamp_by_clock(&n->timestamp, clock);
+        return 0;
+}
diff --git a/src/libsystemd/sd-lldp/lldp-neighbor.h b/src/libsystemd/sd-lldp/lldp-neighbor.h
new file mode 100644
index 0000000000..62dbff42ca
--- /dev/null
+++ b/src/libsystemd/sd-lldp/lldp-neighbor.h
@@ -0,0 +1,91 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+#pragma once
+
+#include <inttypes.h>
+#include <stdbool.h>
+#include <sys/types.h>
+
+#include "sd-lldp.h"
+
+#include "hash-funcs.h"
+#include "lldp-internal.h"
+#include "time-util.h"
+
+typedef struct LLDPNeighborID {
+        /* The spec calls this an "MSAP identifier" */
+        void *chassis_id;
+        size_t chassis_id_size;
+
+        void *port_id;
+        size_t port_id_size;
+} LLDPNeighborID;
+
+struct sd_lldp_neighbor {
+        /* Neighbor objects stay around as long as they are linked into an "sd_lldp" object or n_ref > 0. */
+        sd_lldp *lldp;
+        unsigned n_ref;
+
+        triple_timestamp timestamp;
+
+        usec_t until;
+        unsigned prioq_idx;
+
+        struct ether_addr source_address;
+        struct ether_addr destination_address;
+
+        LLDPNeighborID id;
+
+        /* The raw packet size. The data is appended to the object, accessible via LLDP_NEIGHBOR_RAW() */
+        size_t raw_size;
+
+        /* The current read index for the iterative TLV interface */
+        size_t rindex;
+
+        /* And a couple of fields parsed out. */
+        bool has_ttl:1;
+        bool has_capabilities:1;
+        bool has_port_vlan_id:1;
+
+        uint16_t ttl;
+
+        uint16_t system_capabilities;
+        uint16_t enabled_capabilities;
+
+        char *port_description;
+        char *system_name;
+        char *system_description;
+
+        uint16_t port_vlan_id;
+
+        char *chassis_id_as_string;
+        char *port_id_as_string;
+};
+
+static inline void *LLDP_NEIGHBOR_RAW(const sd_lldp_neighbor *n) {
+        return (uint8_t*) n + ALIGN(sizeof(sd_lldp_neighbor));
+}
+
+static inline uint8_t LLDP_NEIGHBOR_TLV_TYPE(const sd_lldp_neighbor *n) {
+        return ((uint8_t*) LLDP_NEIGHBOR_RAW(n))[n->rindex] >> 1;
+}
+
+static inline size_t LLDP_NEIGHBOR_TLV_LENGTH(const sd_lldp_neighbor *n) {
+        uint8_t *p;
+
+        p = (uint8_t*) LLDP_NEIGHBOR_RAW(n) + n->rindex;
+        return p[1] + (((size_t) (p[0] & 1)) << 8);
+}
+
+static inline void* LLDP_NEIGHBOR_TLV_DATA(const sd_lldp_neighbor *n) {
+        return ((uint8_t*) LLDP_NEIGHBOR_RAW(n)) + n->rindex + 2;
+}
+
+extern const struct hash_ops lldp_neighbor_hash_ops;
+int lldp_neighbor_id_compare_func(const LLDPNeighborID *x, const LLDPNeighborID *y);
+int lldp_neighbor_prioq_compare_func(const void *a, const void *b);
+
+sd_lldp_neighbor *lldp_neighbor_unlink(sd_lldp_neighbor *n);
+sd_lldp_neighbor *lldp_neighbor_new(size_t raw_size);
+int lldp_neighbor_parse(sd_lldp_neighbor *n);
+void lldp_neighbor_start_ttl(sd_lldp_neighbor *n);
+bool lldp_neighbor_equal(const sd_lldp_neighbor *a, const sd_lldp_neighbor *b);
diff --git a/src/libsystemd/sd-lldp/lldp-network.c b/src/libsystemd/sd-lldp/lldp-network.c
new file mode 100644
index 0000000000..870584c0db
--- /dev/null
+++ b/src/libsystemd/sd-lldp/lldp-network.c
@@ -0,0 +1,78 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <linux/filter.h>
+#include <netinet/if_ether.h>
+
+#include "fd-util.h"
+#include "lldp-network.h"
+#include "missing.h"
+#include "socket-util.h"
+
+int lldp_network_bind_raw_socket(int ifindex) {
+
+        static const struct sock_filter filter[] = {
+                BPF_STMT(BPF_LD + BPF_W + BPF_ABS, offsetof(struct ethhdr, h_dest)),      /* A <- 4 bytes of destination MAC */
+                BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0x0180c200, 1, 0),                    /* A != 01:80:c2:00 */
+                BPF_STMT(BPF_RET + BPF_K, 0),                                             /* drop packet */
+                BPF_STMT(BPF_LD + BPF_H + BPF_ABS, offsetof(struct ethhdr, h_dest) + 4),  /* A <- remaining 2 bytes of destination MAC */
+                BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0x0000, 3, 0),                        /* A != 00:00 */
+                BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0x0003, 2, 0),                        /* A != 00:03 */
+                BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0x000e, 1, 0),                        /* A != 00:0e */
+                BPF_STMT(BPF_RET + BPF_K, 0),                                             /* drop packet */
+                BPF_STMT(BPF_LD + BPF_H + BPF_ABS, offsetof(struct ethhdr, h_proto)),     /* A <- protocol */
+                BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, ETHERTYPE_LLDP, 1, 0),                /* A != ETHERTYPE_LLDP */
+                BPF_STMT(BPF_RET + BPF_K, 0),                                             /* drop packet */
+                BPF_STMT(BPF_RET + BPF_K, (uint32_t) -1),                                 /* accept packet */
+        };
+
+        static const struct sock_fprog fprog = {
+                .len = ELEMENTSOF(filter),
+                .filter = (struct sock_filter*) filter,
+        };
+
+        struct packet_mreq mreq = {
+                .mr_ifindex = ifindex,
+                .mr_type = PACKET_MR_MULTICAST,
+                .mr_alen = ETH_ALEN,
+                .mr_address = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x00 }
+        };
+
+        union sockaddr_union saddrll = {
+                .ll.sll_family = AF_PACKET,
+                .ll.sll_ifindex = ifindex,
+        };
+
+        _cleanup_close_ int fd = -1;
+        int r;
+
+        assert(ifindex > 0);
+
+        fd = socket(PF_PACKET, SOCK_RAW|SOCK_CLOEXEC|SOCK_NONBLOCK,
+                    htobe16(ETHERTYPE_LLDP));
+        if (fd < 0)
+                return -errno;
+
+        r = setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &fprog, sizeof(fprog));
+        if (r < 0)
+                return -errno;
+
+        r = setsockopt(fd, SOL_PACKET, PACKET_ADD_MEMBERSHIP, &mreq, sizeof(mreq));
+        if (r < 0)
+                return -errno;
+
+        mreq.mr_address[ETH_ALEN - 1] = 0x03;
+        r = setsockopt(fd, SOL_PACKET, PACKET_ADD_MEMBERSHIP, &mreq, sizeof(mreq));
+        if (r < 0)
+                return -errno;
+
+        mreq.mr_address[ETH_ALEN - 1] = 0x0E;
+        r = setsockopt(fd, SOL_PACKET, PACKET_ADD_MEMBERSHIP, &mreq, sizeof(mreq));
+        if (r < 0)
+                return -errno;
+
+        r = bind(fd, &saddrll.sa, sizeof(saddrll.ll));
+        if (r < 0)
+                return -errno;
+
+        return TAKE_FD(fd);
+}
diff --git a/src/libsystemd/sd-lldp/lldp-network.h b/src/libsystemd/sd-lldp/lldp-network.h
new file mode 100644
index 0000000000..e4ed2898a5
--- /dev/null
+++ b/src/libsystemd/sd-lldp/lldp-network.h
@@ -0,0 +1,6 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+#pragma once
+
+#include "sd-event.h"
+
+int lldp_network_bind_raw_socket(int ifindex);
diff --git a/src/libsystemd/sd-lldp/sd-lldp.c b/src/libsystemd/sd-lldp/sd-lldp.c
new file mode 100644
index 0000000000..1f28c5731f
--- /dev/null
+++ b/src/libsystemd/sd-lldp/sd-lldp.c
@@ -0,0 +1,498 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <arpa/inet.h>
+#include <linux/sockios.h>
+#include <sys/ioctl.h>
+
+#include "sd-lldp.h"
+
+#include "alloc-util.h"
+#include "ether-addr-util.h"
+#include "event-util.h"
+#include "fd-util.h"
+#include "lldp-internal.h"
+#include "lldp-neighbor.h"
+#include "lldp-network.h"
+#include "memory-util.h"
+#include "socket-util.h"
+#include "sort-util.h"
+#include "string-table.h"
+
+#define LLDP_DEFAULT_NEIGHBORS_MAX 128U
+
+static const char * const lldp_event_table[_SD_LLDP_EVENT_MAX] = {
+        [SD_LLDP_EVENT_ADDED]   = "added",
+        [SD_LLDP_EVENT_REMOVED] = "removed",
+        [SD_LLDP_EVENT_UPDATED]   = "updated",
+        [SD_LLDP_EVENT_REFRESHED] = "refreshed",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(lldp_event, sd_lldp_event);
+
+static void lldp_flush_neighbors(sd_lldp *lldp) {
+        assert(lldp);
+
+        hashmap_clear(lldp->neighbor_by_id);
+}
+
+static void lldp_callback(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n) {
+        assert(lldp);
+        assert(event >= 0 && event < _SD_LLDP_EVENT_MAX);
+
+        if (!lldp->callback) {
+                log_lldp("Received '%s' event.", lldp_event_to_string(event));
+                return;
+        }
+
+        log_lldp("Invoking callback for '%s' event.", lldp_event_to_string(event));
+        lldp->callback(lldp, event, n, lldp->userdata);
+}
+
+static int lldp_make_space(sd_lldp *lldp, size_t extra) {
+        usec_t t = USEC_INFINITY;
+        bool changed = false;
+
+        assert(lldp);
+
+        /* Remove all entries that are past their TTL, and more until at least the specified number of extra entries
+         * are free. */
+
+        for (;;) {
+                _cleanup_(sd_lldp_neighbor_unrefp) sd_lldp_neighbor *n = NULL;
+
+                n = prioq_peek(lldp->neighbor_by_expiry);
+                if (!n)
+                        break;
+
+                sd_lldp_neighbor_ref(n);
+
+                if (hashmap_size(lldp->neighbor_by_id) > LESS_BY(lldp->neighbors_max, extra))
+                        goto remove_one;
+
+                if (t == USEC_INFINITY)
+                        t = now(clock_boottime_or_monotonic());
+
+                if (n->until > t)
+                        break;
+
+        remove_one:
+                lldp_neighbor_unlink(n);
+                lldp_callback(lldp, SD_LLDP_EVENT_REMOVED, n);
+                changed = true;
+        }
+
+        return changed;
+}
+
+static bool lldp_keep_neighbor(sd_lldp *lldp, sd_lldp_neighbor *n) {
+        assert(lldp);
+        assert(n);
+
+        /* Don't keep data with a zero TTL */
+        if (n->ttl <= 0)
+                return false;
+
+        /* Filter out data from the filter address */
+        if (!ether_addr_is_null(&lldp->filter_address) &&
+            ether_addr_equal(&lldp->filter_address, &n->source_address))
+                return false;
+
+        /* Only add if the neighbor has a capability we are interested in. Note that we also store all neighbors with
+         * no caps field set. */
+        if (n->has_capabilities &&
+            (n->enabled_capabilities & lldp->capability_mask) == 0)
+                return false;
+
+        /* Keep everything else */
+        return true;
+}
+
+static int lldp_start_timer(sd_lldp *lldp, sd_lldp_neighbor *neighbor);
+
+static int lldp_add_neighbor(sd_lldp *lldp, sd_lldp_neighbor *n) {
+        _cleanup_(sd_lldp_neighbor_unrefp) sd_lldp_neighbor *old = NULL;
+        bool keep;
+        int r;
+
+        assert(lldp);
+        assert(n);
+        assert(!n->lldp);
+
+        keep = lldp_keep_neighbor(lldp, n);
+
+        /* First retrieve the old entry for this MSAP */
+        old = hashmap_get(lldp->neighbor_by_id, &n->id);
+        if (old) {
+                sd_lldp_neighbor_ref(old);
+
+                if (!keep) {
+                        lldp_neighbor_unlink(old);
+                        lldp_callback(lldp, SD_LLDP_EVENT_REMOVED, old);
+                        return 0;
+                }
+
+                if (lldp_neighbor_equal(n, old)) {
+                        /* Is this equal, then restart the TTL counter, but don't do anything else. */
+                        old->timestamp = n->timestamp;
+                        lldp_start_timer(lldp, old);
+                        lldp_callback(lldp, SD_LLDP_EVENT_REFRESHED, old);
+                        return 0;
+                }
+
+                /* Data changed, remove the old entry, and add a new one */
+                lldp_neighbor_unlink(old);
+
+        } else if (!keep)
+                return 0;
+
+        /* Then, make room for at least one new neighbor */
+        lldp_make_space(lldp, 1);
+
+        r = hashmap_put(lldp->neighbor_by_id, &n->id, n);
+        if (r < 0)
+                goto finish;
+
+        r = prioq_put(lldp->neighbor_by_expiry, n, &n->prioq_idx);
+        if (r < 0) {
+                assert_se(hashmap_remove(lldp->neighbor_by_id, &n->id) == n);
+                goto finish;
+        }
+
+        n->lldp = lldp;
+
+        lldp_start_timer(lldp, n);
+        lldp_callback(lldp, old ? SD_LLDP_EVENT_UPDATED : SD_LLDP_EVENT_ADDED, n);
+
+        return 1;
+
+finish:
+        if (old)
+                lldp_callback(lldp, SD_LLDP_EVENT_REMOVED, old);
+
+        return r;
+}
+
+static int lldp_handle_datagram(sd_lldp *lldp, sd_lldp_neighbor *n) {
+        int r;
+
+        assert(lldp);
+        assert(n);
+
+        r = lldp_neighbor_parse(n);
+        if (r == -EBADMSG) /* Ignore bad messages */
+                return 0;
+        if (r < 0)
+                return r;
+
+        r = lldp_add_neighbor(lldp, n);
+        if (r < 0) {
+                log_lldp_errno(r, "Failed to add datagram. Ignoring.");
+                return 0;
+        }
+
+        log_lldp("Successfully processed LLDP datagram.");
+        return 0;
+}
+
+static int lldp_receive_datagram(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
+        _cleanup_(sd_lldp_neighbor_unrefp) sd_lldp_neighbor *n = NULL;
+        ssize_t space, length;
+        sd_lldp *lldp = userdata;
+        struct timespec ts;
+
+        assert(fd >= 0);
+        assert(lldp);
+
+        space = next_datagram_size_fd(fd);
+        if (space < 0)
+                return log_lldp_errno(space, "Failed to determine datagram size to read: %m");
+
+        n = lldp_neighbor_new(space);
+        if (!n)
+                return -ENOMEM;
+
+        length = recv(fd, LLDP_NEIGHBOR_RAW(n), n->raw_size, MSG_DONTWAIT);
+        if (length < 0) {
+                if (IN_SET(errno, EAGAIN, EINTR))
+                        return 0;
+
+                return log_lldp_errno(errno, "Failed to read LLDP datagram: %m");
+        }
+
+        if ((size_t) length != n->raw_size) {
+                log_lldp("Packet size mismatch.");
+                return -EINVAL;
+        }
+
+        /* Try to get the timestamp of this packet if it is known */
+        if (ioctl(fd, SIOCGSTAMPNS, &ts) >= 0)
+                triple_timestamp_from_realtime(&n->timestamp, timespec_load(&ts));
+        else
+                triple_timestamp_get(&n->timestamp);
+
+        return lldp_handle_datagram(lldp, n);
+}
+
+static void lldp_reset(sd_lldp *lldp) {
+        assert(lldp);
+
+        (void) event_source_disable(lldp->timer_event_source);
+        lldp->io_event_source = sd_event_source_unref(lldp->io_event_source);
+        lldp->fd = safe_close(lldp->fd);
+}
+
+_public_ int sd_lldp_start(sd_lldp *lldp) {
+        int r;
+
+        assert_return(lldp, -EINVAL);
+        assert_return(lldp->event, -EINVAL);
+        assert_return(lldp->ifindex > 0, -EINVAL);
+
+        if (lldp->fd >= 0)
+                return 0;
+
+        assert(!lldp->io_event_source);
+
+        lldp->fd = lldp_network_bind_raw_socket(lldp->ifindex);
+        if (lldp->fd < 0)
+                return lldp->fd;
+
+        r = sd_event_add_io(lldp->event, &lldp->io_event_source, lldp->fd, EPOLLIN, lldp_receive_datagram, lldp);
+        if (r < 0)
+                goto fail;
+
+        r = sd_event_source_set_priority(lldp->io_event_source, lldp->event_priority);
+        if (r < 0)
+                goto fail;
+
+        (void) sd_event_source_set_description(lldp->io_event_source, "lldp-io");
+
+        log_lldp("Started LLDP client");
+        return 1;
+
+fail:
+        lldp_reset(lldp);
+        return r;
+}
+
+_public_ int sd_lldp_stop(sd_lldp *lldp) {
+        assert_return(lldp, -EINVAL);
+
+        if (lldp->fd < 0)
+                return 0;
+
+        log_lldp("Stopping LLDP client");
+
+        lldp_reset(lldp);
+        lldp_flush_neighbors(lldp);
+
+        return 1;
+}
+
+_public_ int sd_lldp_attach_event(sd_lldp *lldp, sd_event *event, int64_t priority) {
+        int r;
+
+        assert_return(lldp, -EINVAL);
+        assert_return(lldp->fd < 0, -EBUSY);
+        assert_return(!lldp->event, -EBUSY);
+
+        if (event)
+                lldp->event = sd_event_ref(event);
+        else {
+                r = sd_event_default(&lldp->event);
+                if (r < 0)
+                        return r;
+        }
+
+        lldp->event_priority = priority;
+
+        return 0;
+}
+
+_public_ int sd_lldp_detach_event(sd_lldp *lldp) {
+
+        assert_return(lldp, -EINVAL);
+        assert_return(lldp->fd < 0, -EBUSY);
+
+        lldp->event = sd_event_unref(lldp->event);
+        return 0;
+}
+
+_public_ sd_event* sd_lldp_get_event(sd_lldp *lldp) {
+        assert_return(lldp, NULL);
+
+        return lldp->event;
+}
+
+_public_ int sd_lldp_set_callback(sd_lldp *lldp, sd_lldp_callback_t cb, void *userdata) {
+        assert_return(lldp, -EINVAL);
+
+        lldp->callback = cb;
+        lldp->userdata = userdata;
+
+        return 0;
+}
+
+_public_ int sd_lldp_set_ifindex(sd_lldp *lldp, int ifindex) {
+        assert_return(lldp, -EINVAL);
+        assert_return(ifindex > 0, -EINVAL);
+        assert_return(lldp->fd < 0, -EBUSY);
+
+        lldp->ifindex = ifindex;
+        return 0;
+}
+
+static sd_lldp* lldp_free(sd_lldp *lldp) {
+        assert(lldp);
+
+        lldp->timer_event_source = sd_event_source_unref(lldp->timer_event_source);
+
+        lldp_reset(lldp);
+        sd_lldp_detach_event(lldp);
+        lldp_flush_neighbors(lldp);
+
+        hashmap_free(lldp->neighbor_by_id);
+        prioq_free(lldp->neighbor_by_expiry);
+        return mfree(lldp);
+}
+
+DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_lldp, sd_lldp, lldp_free);
+
+_public_ int sd_lldp_new(sd_lldp **ret) {
+        _cleanup_(sd_lldp_unrefp) sd_lldp *lldp = NULL;
+        int r;
+
+        assert_return(ret, -EINVAL);
+
+        lldp = new(sd_lldp, 1);
+        if (!lldp)
+                return -ENOMEM;
+
+        *lldp = (sd_lldp) {
+                .n_ref = 1,
+                .fd = -1,
+                .neighbors_max = LLDP_DEFAULT_NEIGHBORS_MAX,
+                .capability_mask = (uint16_t) -1,
+        };
+
+        lldp->neighbor_by_id = hashmap_new(&lldp_neighbor_hash_ops);
+        if (!lldp->neighbor_by_id)
+                return -ENOMEM;
+
+        r = prioq_ensure_allocated(&lldp->neighbor_by_expiry, lldp_neighbor_prioq_compare_func);
+        if (r < 0)
+                return r;
+
+        *ret = TAKE_PTR(lldp);
+
+        return 0;
+}
+
+static int neighbor_compare_func(sd_lldp_neighbor * const *a, sd_lldp_neighbor * const *b) {
+        return lldp_neighbor_id_compare_func(&(*a)->id, &(*b)->id);
+}
+
+static int on_timer_event(sd_event_source *s, uint64_t usec, void *userdata) {
+        sd_lldp *lldp = userdata;
+        int r;
+
+        r = lldp_make_space(lldp, 0);
+        if (r < 0)
+                return log_lldp_errno(r, "Failed to make space: %m");
+
+        r = lldp_start_timer(lldp, NULL);
+        if (r < 0)
+                return log_lldp_errno(r, "Failed to restart timer: %m");
+
+        return 0;
+}
+
+static int lldp_start_timer(sd_lldp *lldp, sd_lldp_neighbor *neighbor) {
+        sd_lldp_neighbor *n;
+
+        assert(lldp);
+
+        if (neighbor)
+                lldp_neighbor_start_ttl(neighbor);
+
+        n = prioq_peek(lldp->neighbor_by_expiry);
+        if (!n)
+                return event_source_disable(lldp->timer_event_source);
+
+        if (!lldp->event)
+                return 0;
+
+        return event_reset_time(lldp->event, &lldp->timer_event_source,
+                                clock_boottime_or_monotonic(),
+                                n->until, 0,
+                                on_timer_event, lldp,
+                                lldp->event_priority, "lldp-timer", true);
+}
+
+_public_ int sd_lldp_get_neighbors(sd_lldp *lldp, sd_lldp_neighbor ***ret) {
+        sd_lldp_neighbor **l = NULL, *n;
+        Iterator i;
+        int k = 0, r;
+
+        assert_return(lldp, -EINVAL);
+        assert_return(ret, -EINVAL);
+
+        if (hashmap_isempty(lldp->neighbor_by_id)) { /* Special shortcut */
+                *ret = NULL;
+                return 0;
+        }
+
+        l = new0(sd_lldp_neighbor*, hashmap_size(lldp->neighbor_by_id));
+        if (!l)
+                return -ENOMEM;
+
+        r = lldp_start_timer(lldp, NULL);
+        if (r < 0) {
+                free(l);
+                return r;
+        }
+
+        HASHMAP_FOREACH(n, lldp->neighbor_by_id, i)
+                l[k++] = sd_lldp_neighbor_ref(n);
+
+        assert((size_t) k == hashmap_size(lldp->neighbor_by_id));
+
+        /* Return things in a stable order */
+        typesafe_qsort(l, k, neighbor_compare_func);
+        *ret = l;
+
+        return k;
+}
+
+_public_ int sd_lldp_set_neighbors_max(sd_lldp *lldp, uint64_t m) {
+        assert_return(lldp, -EINVAL);
+        assert_return(m <= 0, -EINVAL);
+
+        lldp->neighbors_max = m;
+        lldp_make_space(lldp, 0);
+
+        return 0;
+}
+
+_public_ int sd_lldp_match_capabilities(sd_lldp *lldp, uint16_t mask) {
+        assert_return(lldp, -EINVAL);
+        assert_return(mask != 0, -EINVAL);
+
+        lldp->capability_mask = mask;
+
+        return 0;
+}
+
+_public_ int sd_lldp_set_filter_address(sd_lldp *lldp, const struct ether_addr *addr) {
+        assert_return(lldp, -EINVAL);
+
+        /* In order to deal nicely with bridges that send back our own packets, allow one address to be filtered, so
+         * that our own can be filtered out here. */
+
+        if (addr)
+                lldp->filter_address = *addr;
+        else
+                zero(lldp->filter_address);
+
+        return 0;
+}
diff --git a/src/libsystemd/sd-lldp/test-lldp.c b/src/libsystemd/sd-lldp/test-lldp.c
new file mode 100644
index 0000000000..7406f94ce0
--- /dev/null
+++ b/src/libsystemd/sd-lldp/test-lldp.c
@@ -0,0 +1,379 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <arpa/inet.h>
+#include <errno.h>
+#include <net/ethernet.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "sd-event.h"
+#include "sd-lldp.h"
+
+#include "alloc-util.h"
+#include "fd-util.h"
+#include "lldp-network.h"
+#include "macro.h"
+#include "string-util.h"
+#include "tests.h"
+
+#define TEST_LLDP_PORT "em1"
+#define TEST_LLDP_TYPE_SYSTEM_NAME "systemd-lldp"
+#define TEST_LLDP_TYPE_SYSTEM_DESC "systemd-lldp-desc"
+
+static int test_fd[2] = { -1, -1 };
+static int lldp_handler_calls;
+
+int lldp_network_bind_raw_socket(int ifindex) {
+        if (socketpair(AF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0, test_fd) < 0)
+                return -errno;
+
+        return test_fd[0];
+}
+
+static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
+        lldp_handler_calls++;
+}
+
+static int start_lldp(sd_lldp **lldp, sd_event *e, sd_lldp_callback_t cb, void *cb_data) {
+        int r;
+
+        r = sd_lldp_new(lldp);
+        if (r < 0)
+                return r;
+
+        r = sd_lldp_set_ifindex(*lldp, 42);
+        if (r < 0)
+                return r;
+
+        r = sd_lldp_set_callback(*lldp, cb, cb_data);
+        if (r < 0)
+                return r;
+
+        r = sd_lldp_attach_event(*lldp, e, 0);
+        if (r < 0)
+                return r;
+
+        r = sd_lldp_start(*lldp);
+        if (r < 0)
+                return r;
+
+        return 0;
+}
+
+static int stop_lldp(sd_lldp *lldp) {
+        int r;
+
+        r = sd_lldp_stop(lldp);
+        if (r < 0)
+                return r;
+
+        r = sd_lldp_detach_event(lldp);
+        if (r < 0)
+                return r;
+
+        sd_lldp_unref(lldp);
+        safe_close(test_fd[1]);
+
+        return 0;
+}
+
+static void test_receive_basic_packet(sd_event *e) {
+
+        static const uint8_t frame[] = {
+                /* Ethernet header */
+                0x01, 0x80, 0xc2, 0x00, 0x00, 0x03,     /* Destination MAC */
+                0x01, 0x02, 0x03, 0x04, 0x05, 0x06,     /* Source MAC */
+                0x88, 0xcc,                             /* Ethertype */
+                /* LLDP mandatory TLVs */
+                0x02, 0x07, 0x04, 0x00, 0x01, 0x02,     /* Chassis: MAC, 00:01:02:03:04:05 */
+                0x03, 0x04, 0x05,
+                0x04, 0x04, 0x05, 0x31, 0x2f, 0x33,     /* Port: interface name, "1/3" */
+                0x06, 0x02, 0x00, 0x78,                 /* TTL: 120 seconds */
+                /* LLDP optional TLVs */
+                0x08, 0x04, 0x50, 0x6f, 0x72, 0x74,     /* Port Description: "Port" */
+                0x0a, 0x03, 0x53, 0x59, 0x53,           /* System Name: "SYS" */
+                0x0c, 0x04, 0x66, 0x6f, 0x6f, 0x00,     /* System Description: "foo" (NULL-terminated) */
+                0x00, 0x00                              /* End Of LLDPDU */
+        };
+
+        sd_lldp *lldp;
+        sd_lldp_neighbor **neighbors;
+        uint8_t type;
+        const void *data;
+        uint16_t ttl;
+        size_t length;
+        const char *str;
+
+        lldp_handler_calls = 0;
+        assert_se(start_lldp(&lldp, e, lldp_handler, NULL) == 0);
+
+        assert_se(write(test_fd[1], frame, sizeof(frame)) == sizeof(frame));
+        sd_event_run(e, 0);
+        assert_se(lldp_handler_calls == 1);
+        assert_se(sd_lldp_get_neighbors(lldp, &neighbors) == 1);
+
+        assert_se(sd_lldp_neighbor_get_chassis_id(neighbors[0], &type, &data, &length) == 0);
+        assert_se(type == SD_LLDP_CHASSIS_SUBTYPE_MAC_ADDRESS);
+        assert_se(length == ETH_ALEN);
+        assert_se(!memcmp(data, "\x00\x01\x02\x03\x04\x05", ETH_ALEN));
+
+        assert_se(sd_lldp_neighbor_get_port_id(neighbors[0], &type, &data, &length) == 0);
+        assert_se(type == SD_LLDP_PORT_SUBTYPE_INTERFACE_NAME);
+        assert_se(length == 3);
+        assert_se(!memcmp(data, "1/3", 3));
+
+        assert_se(sd_lldp_neighbor_get_port_description(neighbors[0], &str) == 0);
+        assert_se(streq(str, "Port"));
+
+        assert_se(sd_lldp_neighbor_get_system_name(neighbors[0], &str) == 0);
+        assert_se(streq(str, "SYS"));
+
+        assert_se(sd_lldp_neighbor_get_system_description(neighbors[0], &str) == 0);
+        assert_se(streq(str, "foo"));
+
+        assert_se(sd_lldp_neighbor_get_ttl(neighbors[0], &ttl) == 0);
+        assert_se(ttl == 120);
+
+        sd_lldp_neighbor_unref(neighbors[0]);
+        free(neighbors);
+
+        assert_se(stop_lldp(lldp) == 0);
+}
+
+static void test_receive_incomplete_packet(sd_event *e) {
+        sd_lldp *lldp;
+        sd_lldp_neighbor **neighbors;
+        uint8_t frame[] = {
+                /* Ethernet header */
+                0x01, 0x80, 0xc2, 0x00, 0x00, 0x03,     /* Destination MAC */
+                0x01, 0x02, 0x03, 0x04, 0x05, 0x06,     /* Source MAC */
+                0x88, 0xcc,                             /* Ethertype */
+                /* LLDP mandatory TLVs */
+                0x02, 0x07, 0x04, 0x00, 0x01, 0x02,     /* Chassis: MAC, 00:01:02:03:04:05 */
+                0x03, 0x04, 0x05,
+                0x04, 0x04, 0x05, 0x31, 0x2f, 0x33,     /* Port: interface name, "1/3" */
+                                                        /* Missing TTL */
+                0x00, 0x00                              /* End Of LLDPDU */
+        };
+
+        lldp_handler_calls = 0;
+        assert_se(start_lldp(&lldp, e, lldp_handler, NULL) == 0);
+
+        assert_se(write(test_fd[1], frame, sizeof(frame)) == sizeof(frame));
+        sd_event_run(e, 0);
+        assert_se(lldp_handler_calls == 0);
+        assert_se(sd_lldp_get_neighbors(lldp, &neighbors) == 0);
+
+        assert_se(stop_lldp(lldp) == 0);
+}
+
+static void test_receive_oui_packet(sd_event *e) {
+        sd_lldp *lldp;
+        sd_lldp_neighbor **neighbors;
+        uint8_t frame[] = {
+                /* Ethernet header */
+                0x01, 0x80, 0xc2, 0x00, 0x00, 0x03,     /* Destination MAC */
+                0x01, 0x02, 0x03, 0x04, 0x05, 0x06,     /* Source MAC */
+                0x88, 0xcc,                             /* Ethertype */
+                /* LLDP mandatory TLVs */
+                0x02, 0x07, 0x04, 0x00, 0x01, 0x02,     /* Chassis: MAC, 00:01:02:03:04:05 */
+                0x03, 0x04, 0x05,
+                0x04, 0x04, 0x05, 0x31, 0x2f, 0x33,     /* Port TLV: interface name, "1/3" */
+                0x06, 0x02, 0x00, 0x78,                 /* TTL: 120 seconds */
+                /* LLDP optional TLVs */
+                0xfe, 0x06, 0x00, 0x80, 0xc2, 0x01,     /* Port VLAN ID: 0x1234 */
+                0x12, 0x34,
+                0xfe, 0x07, 0x00, 0x80, 0xc2, 0x02,     /* Port and protocol: flag 1, PPVID 0x7788 */
+                0x01, 0x77, 0x88,
+                0xfe, 0x0d, 0x00, 0x80, 0xc2, 0x03,     /* VLAN Name: ID 0x1234, name "Vlan51" */
+                0x12, 0x34, 0x06, 0x56, 0x6c, 0x61,
+                0x6e, 0x35, 0x31,
+                0xfe, 0x06, 0x00, 0x80, 0xc2, 0x06,     /* Management VID: 0x0102 */
+                0x01, 0x02,
+                0xfe, 0x09, 0x00, 0x80, 0xc2, 0x07,     /* Link aggregation: status 1, ID 0x00140012 */
+                0x01, 0x00, 0x14, 0x00, 0x12,
+                0xfe, 0x07, 0x00, 0x12, 0x0f, 0x02,     /* 802.3 Power via MDI: PSE, MDI enabled */
+                0x07, 0x01, 0x00,
+                0x00, 0x00                              /* End of LLDPDU */
+        };
+
+        lldp_handler_calls = 0;
+        assert_se(start_lldp(&lldp, e, lldp_handler, NULL) == 0);
+
+        assert_se(write(test_fd[1], frame, sizeof(frame)) == sizeof(frame));
+        sd_event_run(e, 0);
+        assert_se(lldp_handler_calls == 1);
+        assert_se(sd_lldp_get_neighbors(lldp, &neighbors) == 1);
+
+        assert_se(sd_lldp_neighbor_tlv_rewind(neighbors[0]) >= 0);
+        assert_se(sd_lldp_neighbor_tlv_is_type(neighbors[0], SD_LLDP_TYPE_CHASSIS_ID) > 0);
+        assert_se(sd_lldp_neighbor_tlv_next(neighbors[0]) > 0);
+        assert_se(sd_lldp_neighbor_tlv_is_type(neighbors[0], SD_LLDP_TYPE_PORT_ID) > 0);
+        assert_se(sd_lldp_neighbor_tlv_next(neighbors[0]) > 0);
+        assert_se(sd_lldp_neighbor_tlv_is_type(neighbors[0], SD_LLDP_TYPE_TTL) > 0);
+        assert_se(sd_lldp_neighbor_tlv_next(neighbors[0]) > 0);
+        assert_se(sd_lldp_neighbor_tlv_is_oui(neighbors[0], SD_LLDP_OUI_802_1, SD_LLDP_OUI_802_1_SUBTYPE_PORT_VLAN_ID) > 0);
+        assert_se(sd_lldp_neighbor_tlv_next(neighbors[0]) > 0);
+        assert_se(sd_lldp_neighbor_tlv_is_oui(neighbors[0], SD_LLDP_OUI_802_1, SD_LLDP_OUI_802_1_SUBTYPE_PORT_PROTOCOL_VLAN_ID) > 0);
+        assert_se(sd_lldp_neighbor_tlv_next(neighbors[0]) > 0);
+        assert_se(sd_lldp_neighbor_tlv_is_oui(neighbors[0], SD_LLDP_OUI_802_1, SD_LLDP_OUI_802_1_SUBTYPE_VLAN_NAME) > 0);
+        assert_se(sd_lldp_neighbor_tlv_next(neighbors[0]) > 0);
+        assert_se(sd_lldp_neighbor_tlv_is_oui(neighbors[0], SD_LLDP_OUI_802_1, SD_LLDP_OUI_802_1_SUBTYPE_MANAGEMENT_VID) > 0);
+        assert_se(sd_lldp_neighbor_tlv_next(neighbors[0]) > 0);
+        assert_se(sd_lldp_neighbor_tlv_is_oui(neighbors[0], SD_LLDP_OUI_802_1, SD_LLDP_OUI_802_1_SUBTYPE_LINK_AGGREGATION) > 0);
+        assert_se(sd_lldp_neighbor_tlv_next(neighbors[0]) > 0);
+        assert_se(sd_lldp_neighbor_tlv_is_oui(neighbors[0], SD_LLDP_OUI_802_3, SD_LLDP_OUI_802_3_SUBTYPE_POWER_VIA_MDI) > 0);
+        assert_se(sd_lldp_neighbor_tlv_next(neighbors[0]) > 0);
+        assert_se(sd_lldp_neighbor_tlv_is_type(neighbors[0], SD_LLDP_TYPE_END) > 0);
+        assert_se(sd_lldp_neighbor_tlv_next(neighbors[0]) == 0);
+
+        sd_lldp_neighbor_unref(neighbors[0]);
+        free(neighbors);
+
+        assert_se(stop_lldp(lldp) == 0);
+}
+
+static void test_multiple_neighbors_sorted(sd_event *e) {
+
+        static const uint8_t frame1[] = {
+                /* Ethernet header */
+                0x01, 0x80, 0xc2, 0x00, 0x00, 0x03,     /* Destination MAC */
+                0x01, 0x02, 0x03, 0x04, 0x05, 0x06,     /* Source MAC */
+                0x88, 0xcc,                             /* Ethertype */
+                /* LLDP mandatory TLVs */
+                0x02, 0x04, 0x01, '1', '/', '2',        /* Chassis component: "1/2" */
+                0x04, 0x04, 0x02, '2', '/', '3',        /* Port component: "2/3" */
+                0x06, 0x02, 0x00, 0x78,                 /* TTL: 120 seconds */
+                0x00, 0x00                              /* End Of LLDPDU */
+        };
+        static const uint8_t frame2[] = {
+                /* Ethernet header */
+                0x01, 0x80, 0xc2, 0x00, 0x00, 0x03,     /* Destination MAC */
+                0x01, 0x02, 0x03, 0x04, 0x05, 0x06,     /* Source MAC */
+                0x88, 0xcc,                             /* Ethertype */
+                /* LLDP mandatory TLVs */
+                0x02, 0x04, 0x01, '2', '/', '1',        /* Chassis component: "2/1" */
+                0x04, 0x04, 0x02, '1', '/', '3',        /* Port component: "1/3" */
+                0x06, 0x02, 0x00, 0x78,                 /* TTL: 120 seconds */
+                0x00, 0x00                              /* End Of LLDPDU */
+        };
+        static const uint8_t frame3[] = {
+                /* Ethernet header */
+                0x01, 0x80, 0xc2, 0x00, 0x00, 0x03,     /* Destination MAC */
+                0x01, 0x02, 0x03, 0x04, 0x05, 0x06,     /* Source MAC */
+                0x88, 0xcc,                             /* Ethertype */
+                /* LLDP mandatory TLVs */
+                0x02, 0x05, 0x01, '2', '/', '1', '0',   /* Chassis component: "2/10" */
+                0x04, 0x04, 0x02, '1', '/', '0',        /* Port component: "1/0" */
+                0x06, 0x02, 0x00, 0x78,                 /* TTL: 120 seconds */
+                0x00, 0x00                              /* End Of LLDPDU */
+        };
+        static const uint8_t frame4[] = {
+                /* Ethernet header */
+                0x01, 0x80, 0xc2, 0x00, 0x00, 0x03,     /* Destination MAC */
+                0x01, 0x02, 0x03, 0x04, 0x05, 0x06,     /* Source MAC */
+                0x88, 0xcc,                             /* Ethertype */
+                /* LLDP mandatory TLVs */
+                0x02, 0x05, 0x01, '2', '/', '1', '9',   /* Chassis component: "2/19" */
+                0x04, 0x04, 0x02, '1', '/', '0',        /* Port component: "1/0" */
+                0x06, 0x02, 0x00, 0x78,                 /* TTL: 120 seconds */
+                0x00, 0x00                              /* End Of LLDPDU */
+        };
+        static const uint8_t frame5[] = {
+                /* Ethernet header */
+                0x01, 0x80, 0xc2, 0x00, 0x00, 0x03,     /* Destination MAC */
+                0x01, 0x02, 0x03, 0x04, 0x05, 0x06,     /* Source MAC */
+                0x88, 0xcc,                             /* Ethertype */
+                /* LLDP mandatory TLVs */
+                0x02, 0x04, 0x01, '1', '/', '2',        /* Chassis component: "1/2" */
+                0x04, 0x05, 0x02, '2', '/', '1', '0',   /* Port component: "2/10" */
+                0x06, 0x02, 0x00, 0x78,                 /* TTL: 120 seconds */
+                0x00, 0x00                              /* End Of LLDPDU */
+        };
+        static const uint8_t frame6[] = {
+                /* Ethernet header */
+                0x01, 0x80, 0xc2, 0x00, 0x00, 0x03,     /* Destination MAC */
+                0x01, 0x02, 0x03, 0x04, 0x05, 0x06,     /* Source MAC */
+                0x88, 0xcc,                             /* Ethertype */
+                /* LLDP mandatory TLVs */
+                0x02, 0x04, 0x01, '1', '/', '2',        /* Chassis component: "1/2" */
+                0x04, 0x05, 0x02, '2', '/', '3', '9',   /* Port component: "2/10" */
+                0x06, 0x02, 0x00, 0x78,                 /* TTL: 120 seconds */
+                0x00, 0x00                              /* End Of LLDPDU */
+        };
+        static const char* expected[] = {
+                /* ordered pairs of Chassis+Port */
+                "1/2", "2/10",
+                "1/2", "2/3",
+                "1/2", "2/39",
+                "2/1", "1/3",
+                "2/10", "1/0",
+                "2/19", "1/0",
+        };
+
+        sd_lldp *lldp;
+        sd_lldp_neighbor **neighbors;
+        int i;
+        uint8_t type;
+        const void *data;
+        size_t length, expected_length;
+        uint16_t ttl;
+
+        lldp_handler_calls = 0;
+        assert_se(start_lldp(&lldp, e, lldp_handler, NULL) == 0);
+
+        assert_se(write(test_fd[1], frame1, sizeof(frame1)) == sizeof(frame1));
+        sd_event_run(e, 0);
+        assert_se(write(test_fd[1], frame2, sizeof(frame2)) == sizeof(frame2));
+        sd_event_run(e, 0);
+        assert_se(write(test_fd[1], frame3, sizeof(frame3)) == sizeof(frame3));
+        sd_event_run(e, 0);
+        assert_se(write(test_fd[1], frame4, sizeof(frame4)) == sizeof(frame4));
+        sd_event_run(e, 0);
+        assert_se(write(test_fd[1], frame5, sizeof(frame5)) == sizeof(frame5));
+        sd_event_run(e, 0);
+        assert_se(write(test_fd[1], frame6, sizeof(frame6)) == sizeof(frame6));
+        sd_event_run(e, 0);
+        assert_se(lldp_handler_calls == 6);
+
+        assert_se(sd_lldp_get_neighbors(lldp, &neighbors) == 6);
+
+        for (i = 0; i < 6; i++) {
+                assert_se(sd_lldp_neighbor_get_chassis_id(neighbors[i], &type, &data, &length) == 0);
+                assert_se(type == SD_LLDP_CHASSIS_SUBTYPE_CHASSIS_COMPONENT);
+                expected_length = strlen(expected[2 * i]);
+                assert_se(length == expected_length);
+                assert_se(memcmp(data, expected[2 * i], expected_length) == 0);
+
+                assert_se(sd_lldp_neighbor_get_port_id(neighbors[i], &type, &data, &length) == 0);
+                assert_se(type == SD_LLDP_PORT_SUBTYPE_PORT_COMPONENT);
+                expected_length = strlen(expected[2 * i + 1]);
+                assert_se(length == expected_length);
+                assert_se(memcmp(data, expected[2 * i + 1], expected_length) == 0);
+
+                assert_se(sd_lldp_neighbor_get_ttl(neighbors[i], &ttl) == 0);
+                assert_se(ttl == 120);
+        }
+
+        for (i = 0; i < 6; i++)
+                sd_lldp_neighbor_unref(neighbors[i]);
+        free(neighbors);
+
+        assert_se(stop_lldp(lldp) == 0);
+}
+
+int main(int argc, char *argv[]) {
+        _cleanup_(sd_event_unrefp) sd_event *e = NULL;
+
+        test_setup_logging(LOG_DEBUG);
+
+        /* LLDP reception tests */
+        assert_se(sd_event_new(&e) == 0);
+        test_receive_basic_packet(e);
+        test_receive_incomplete_packet(e);
+        test_receive_oui_packet(e);
+        test_multiple_neighbors_sorted(e);
+
+        return 0;
+}
diff --git a/src/systemd/meson.build b/src/systemd/meson.build
index 75c48b07a5..887421bee0 100644
--- a/src/systemd/meson.build
+++ b/src/systemd/meson.build
@@ -12,6 +12,7 @@ _systemd_headers = '''
         sd-journal.h
         sd-login.h
         sd-messages.h
+        sd-lldp.h
 '''.split()
 
 # https://github.com/mesonbuild/meson/issues/1633
@@ -25,7 +26,6 @@ _not_installed_headers = '''
         sd-dhcp-server.h
         sd-ipv4acd.h
         sd-ipv4ll.h
-        sd-lldp.h
         sd-ndisc.h
         sd-netlink.h
         sd-network.h
diff --git a/src/test/meson.build b/src/test/meson.build
index de31e977bc..680d1dec6b 100644
--- a/src/test/meson.build
+++ b/src/test/meson.build
@@ -1010,6 +1010,11 @@ tests += [
          [],
          []],
 
+        [['src/libsystemd/sd-lldp/test-lldp.c'],
+         [libbasic,libshared_static,libsystemd_static
+          ],
+         []],
+
 ]
 
 # test-bus-vtable-cc.cc is a symlink and symlinks get lost in containers on FuzzBuzz.
@@ -1098,11 +1103,6 @@ tests += [
          [libshared,
           libsystemd_network],
          []],
-
-        [['src/libsystemd-network/test-lldp.c'],
-         [libshared,
-          libsystemd_network],
-         []],
 ]
 
 ############################################################
-- 
2.28.0