diff options
Diffstat (limited to 'src/libsystemd-network/lldp-neighbor.c')
| -rw-r--r-- | src/libsystemd-network/lldp-neighbor.c | 795 |
1 files changed, 795 insertions, 0 deletions
diff --git a/src/libsystemd-network/lldp-neighbor.c b/src/libsystemd-network/lldp-neighbor.c new file mode 100644 index 0000000..af61c9b --- /dev/null +++ b/src/libsystemd-network/lldp-neighbor.c @@ -0,0 +1,795 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include "alloc-util.h" +#include "escape.h" +#include "ether-addr-util.h" +#include "hexdecoct.h" +#include "in-addr-util.h" +#include "lldp-neighbor.h" +#include "memory-util.h" +#include "missing_network.h" +#include "unaligned.h" + +static void lldp_neighbor_id_hash_func(const LLDPNeighborID *id, struct siphash *state) { + assert(id); + assert(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) { + assert(x); + assert(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; + + assert(x); + assert(y); + + return CMP(x->until, y->until); +} + +sd_lldp_neighbor *sd_lldp_neighbor_ref(sd_lldp_neighbor *n) { + if (!n) + return NULL; + + assert(n->n_ref > 0 || n->lldp_rx); + n->n_ref++; + + return n; +} + +static sd_lldp_neighbor *lldp_neighbor_free(sd_lldp_neighbor *n) { + if (!n) + return NULL; + + free(n->id.port_id); + free(n->id.chassis_id); + free(n->port_description); + free(n->system_name); + free(n->system_description); + free(n->mud_url); + free(n->chassis_id_as_string); + free(n->port_id_as_string); + return mfree(n); +} + +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_rx) + 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_rx) + 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_rx->neighbor_by_id, &n->id, n); + + assert_se(prioq_remove(n->lldp_rx->neighbor_by_expiry, n, &n->prioq_idx) >= 0); + + n->lldp_rx = 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; + + if (raw_size > SIZE_MAX - ALIGN(sizeof(sd_lldp_neighbor))) + return NULL; + + 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(sd_lldp_rx *lldp_rx, char **s, const void *q, size_t n) { + const char *p = q; + char *k; + + assert(s); + assert(p || n == 0); + + if (*s) { + log_lldp_rx(lldp_rx, "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_rx(lldp_rx, "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 log_oom_debug(); + + free_and_replace(*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)) + return log_lldp_rx_errno(n->lldp_rx, SYNTHETIC_ERRNO(EBADMSG), + "Received truncated packet, ignoring."); + + memcpy(&h, LLDP_NEIGHBOR_RAW(n), sizeof(h)); + + if (h.ether_type != htobe16(ETHERTYPE_LLDP)) + return log_lldp_rx_errno(n->lldp_rx, SYNTHETIC_ERRNO(EBADMSG), + "Received packet with wrong type, ignoring."); + + 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)) + return log_lldp_rx_errno(n->lldp_rx, SYNTHETIC_ERRNO(EBADMSG), + "Received packet with wrong destination address, ignoring."); + + 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) + return log_lldp_rx_errno(n->lldp_rx, SYNTHETIC_ERRNO(EBADMSG), + "TLV lacks header, ignoring."); + + type = p[0] >> 1; + length = p[1] + (((uint16_t) (p[0] & 1)) << 8); + p += 2, left -= 2; + + if (left < length) + return log_lldp_rx_errno(n->lldp_rx, SYNTHETIC_ERRNO(EBADMSG), + "TLV truncated, ignoring datagram."); + + switch (type) { + + case SD_LLDP_TYPE_END: + if (length != 0) + return log_lldp_rx_errno(n->lldp_rx, SYNTHETIC_ERRNO(EBADMSG), + "End marker TLV not zero-sized, ignoring datagram."); + + /* 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 */ + return log_lldp_rx_errno(n->lldp_rx, SYNTHETIC_ERRNO(EBADMSG), + "Chassis ID field size out of range, ignoring datagram."); + + if (n->id.chassis_id) + return log_lldp_rx_errno(n->lldp_rx, SYNTHETIC_ERRNO(EBADMSG), + "Duplicate chassis ID field, ignoring datagram."); + + n->id.chassis_id = memdup(p, length); + if (!n->id.chassis_id) + return log_oom_debug(); + + 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 */ + return log_lldp_rx_errno(n->lldp_rx, SYNTHETIC_ERRNO(EBADMSG), + "Port ID field size out of range, ignoring datagram."); + + if (n->id.port_id) + return log_lldp_rx_errno(n->lldp_rx, SYNTHETIC_ERRNO(EBADMSG), + "Duplicate port ID field, ignoring datagram."); + + n->id.port_id = memdup(p, length); + if (!n->id.port_id) + return log_oom_debug(); + + n->id.port_id_size = length; + break; + + case SD_LLDP_TYPE_TTL: + if (length != 2) + return log_lldp_rx_errno(n->lldp_rx, SYNTHETIC_ERRNO(EBADMSG), + "TTL field has wrong size, ignoring datagram."); + + if (n->has_ttl) + return log_lldp_rx_errno(n->lldp_rx, SYNTHETIC_ERRNO(EBADMSG), + "Duplicate TTL field, ignoring datagram."); + + n->ttl = unaligned_read_be16(p); + n->has_ttl = true; + break; + + case SD_LLDP_TYPE_PORT_DESCRIPTION: + r = parse_string(n->lldp_rx, &n->port_description, p, length); + if (r < 0) + return r; + break; + + case SD_LLDP_TYPE_SYSTEM_NAME: + r = parse_string(n->lldp_rx, &n->system_name, p, length); + if (r < 0) + return r; + break; + + case SD_LLDP_TYPE_SYSTEM_DESCRIPTION: + r = parse_string(n->lldp_rx, &n->system_description, p, length); + if (r < 0) + return r; + break; + + case SD_LLDP_TYPE_SYSTEM_CAPABILITIES: + if (length != 4) + return log_lldp_rx_errno(n->lldp_rx, SYNTHETIC_ERRNO(EBADMSG), + "System capabilities field has wrong size."); + + 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) + return log_lldp_rx_errno(n->lldp_rx, SYNTHETIC_ERRNO(EBADMSG), + "Found private TLV that is too short, ignoring."); + + /* RFC 8520: MUD URL */ + if (memcmp(p, SD_LLDP_OUI_IANA_MUD, sizeof(SD_LLDP_OUI_IANA_MUD)) == 0) { + r = parse_string(n->lldp_rx, &n->mud_url, p + sizeof(SD_LLDP_OUI_IANA_MUD), + length - sizeof(SD_LLDP_OUI_IANA_MUD)); + if (r < 0) + return r; + } + break; + } + + p += length, left -= length; + } + +end_marker: + if (!n->id.chassis_id || !n->id.port_id || !n->has_ttl) + return log_lldp_rx_errno(n->lldp_rx, SYNTHETIC_ERRNO(EBADMSG), + "One or more mandatory TLV missing in datagram. Ignoring."); + + 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); + if (!timestamp_is_set(base)) + base = now(CLOCK_BOOTTIME); /* Otherwise, take the current time */ + + n->until = usec_add(base, n->ttl * USEC_PER_SEC); + } else + n->until = 0; + + if (n->lldp_rx) + prioq_reshuffle(n->lldp_rx->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; +} + +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; +} + +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; +} + +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; +} + +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; +} + +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; +} + +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; +} + +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; +} + +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; +} + +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; +} + +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; +} + +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; +} + +int sd_lldp_neighbor_get_mud_url(sd_lldp_neighbor *n, const char **ret) { + assert_return(n, -EINVAL); + assert_return(ret, -EINVAL); + + if (!n->mud_url) + return -ENODATA; + + *ret = n->mud_url; + return 0; +} + +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; +} + +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; +} + +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_safe(LLDP_NEIGHBOR_RAW(n), raw, raw_size); + + r = lldp_neighbor_parse(n); + if (r < 0) + return r; + + *ret = TAKE_PTR(n); + + return r; +} + +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; +} + +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; +} + +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; +} + +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; +} + +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; +} + +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; +} + +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; +} + +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; +} |