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-rw-r--r--src/network/networkd-neighbor.c756
1 files changed, 756 insertions, 0 deletions
diff --git a/src/network/networkd-neighbor.c b/src/network/networkd-neighbor.c
new file mode 100644
index 0000000..8321831
--- /dev/null
+++ b/src/network/networkd-neighbor.c
@@ -0,0 +1,756 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "alloc-util.h"
+#include "hashmap.h"
+#include "netlink-util.h"
+#include "networkd-link.h"
+#include "networkd-manager.h"
+#include "networkd-neighbor.h"
+#include "networkd-network.h"
+#include "networkd-queue.h"
+#include "set.h"
+
+Neighbor *neighbor_free(Neighbor *neighbor) {
+ if (!neighbor)
+ return NULL;
+
+ if (neighbor->network) {
+ assert(neighbor->section);
+ ordered_hashmap_remove(neighbor->network->neighbors_by_section, neighbor->section);
+ }
+
+ config_section_free(neighbor->section);
+
+ if (neighbor->link)
+ set_remove(neighbor->link->neighbors, neighbor);
+
+ return mfree(neighbor);
+}
+
+DEFINE_SECTION_CLEANUP_FUNCTIONS(Neighbor, neighbor_free);
+
+static int neighbor_new_static(Network *network, const char *filename, unsigned section_line, Neighbor **ret) {
+ _cleanup_(config_section_freep) ConfigSection *n = NULL;
+ _cleanup_(neighbor_freep) Neighbor *neighbor = NULL;
+ int r;
+
+ assert(network);
+ assert(ret);
+ assert(filename);
+ assert(section_line > 0);
+
+ r = config_section_new(filename, section_line, &n);
+ if (r < 0)
+ return r;
+
+ neighbor = ordered_hashmap_get(network->neighbors_by_section, n);
+ if (neighbor) {
+ *ret = TAKE_PTR(neighbor);
+ return 0;
+ }
+
+ neighbor = new(Neighbor, 1);
+ if (!neighbor)
+ return -ENOMEM;
+
+ *neighbor = (Neighbor) {
+ .network = network,
+ .family = AF_UNSPEC,
+ .section = TAKE_PTR(n),
+ .source = NETWORK_CONFIG_SOURCE_STATIC,
+ };
+
+ r = ordered_hashmap_ensure_put(&network->neighbors_by_section, &config_section_hash_ops, neighbor->section, neighbor);
+ if (r < 0)
+ return r;
+
+ *ret = TAKE_PTR(neighbor);
+ return 0;
+}
+
+static int neighbor_dup(const Neighbor *neighbor, Neighbor **ret) {
+ _cleanup_(neighbor_freep) Neighbor *dest = NULL;
+
+ assert(neighbor);
+ assert(ret);
+
+ dest = newdup(Neighbor, neighbor, 1);
+ if (!dest)
+ return -ENOMEM;
+
+ /* Unset all pointers */
+ dest->link = NULL;
+ dest->network = NULL;
+ dest->section = NULL;
+
+ *ret = TAKE_PTR(dest);
+ return 0;
+}
+
+static void neighbor_hash_func(const Neighbor *neighbor, struct siphash *state) {
+ assert(neighbor);
+
+ siphash24_compress(&neighbor->family, sizeof(neighbor->family), state);
+
+ if (!IN_SET(neighbor->family, AF_INET, AF_INET6))
+ /* treat any other address family as AF_UNSPEC */
+ return;
+
+ /* Equality of neighbors are given by the destination address.
+ * See neigh_lookup() in the kernel. */
+ siphash24_compress(&neighbor->in_addr, FAMILY_ADDRESS_SIZE(neighbor->family), state);
+}
+
+static int neighbor_compare_func(const Neighbor *a, const Neighbor *b) {
+ int r;
+
+ r = CMP(a->family, b->family);
+ if (r != 0)
+ return r;
+
+ if (!IN_SET(a->family, AF_INET, AF_INET6))
+ /* treat any other address family as AF_UNSPEC */
+ return 0;
+
+ return memcmp(&a->in_addr, &b->in_addr, FAMILY_ADDRESS_SIZE(a->family));
+}
+
+DEFINE_PRIVATE_HASH_OPS(
+ neighbor_hash_ops,
+ Neighbor,
+ neighbor_hash_func,
+ neighbor_compare_func);
+
+DEFINE_PRIVATE_HASH_OPS_WITH_KEY_DESTRUCTOR(
+ neighbor_hash_ops_free,
+ Neighbor,
+ neighbor_hash_func,
+ neighbor_compare_func,
+ neighbor_free);
+
+static int neighbor_get_request(Link *link, const Neighbor *neighbor, Request **ret) {
+ Request *req;
+
+ assert(link);
+ assert(link->manager);
+ assert(neighbor);
+
+ req = ordered_set_get(
+ link->manager->request_queue,
+ &(Request) {
+ .link = link,
+ .type = REQUEST_TYPE_NEIGHBOR,
+ .userdata = (void*) neighbor,
+ .hash_func = (hash_func_t) neighbor_hash_func,
+ .compare_func = (compare_func_t) neighbor_compare_func,
+ });
+ if (!req)
+ return -ENOENT;
+
+ if (ret)
+ *ret = req;
+ return 0;
+}
+
+static int neighbor_get(Link *link, const Neighbor *in, Neighbor **ret) {
+ Neighbor *existing;
+
+ assert(link);
+ assert(in);
+
+ existing = set_get(link->neighbors, in);
+ if (!existing)
+ return -ENOENT;
+
+ if (ret)
+ *ret = existing;
+ return 0;
+}
+
+static int neighbor_add(Link *link, Neighbor *neighbor) {
+ int r;
+
+ assert(link);
+ assert(neighbor);
+
+ r = set_ensure_put(&link->neighbors, &neighbor_hash_ops_free, neighbor);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ return -EEXIST;
+
+ neighbor->link = link;
+ return 0;
+}
+
+static void log_neighbor_debug(const Neighbor *neighbor, const char *str, const Link *link) {
+ _cleanup_free_ char *state = NULL;
+
+ assert(neighbor);
+ assert(str);
+
+ if (!DEBUG_LOGGING)
+ return;
+
+ (void) network_config_state_to_string_alloc(neighbor->state, &state);
+
+ log_link_debug(link,
+ "%s %s neighbor (%s): lladdr: %s, dst: %s",
+ str, strna(network_config_source_to_string(neighbor->source)), strna(state),
+ HW_ADDR_TO_STR(&neighbor->ll_addr),
+ IN_ADDR_TO_STRING(neighbor->family, &neighbor->in_addr));
+}
+
+static int neighbor_configure(Neighbor *neighbor, Link *link, Request *req) {
+ _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
+ int r;
+
+ assert(neighbor);
+ assert(link);
+ assert(link->ifindex > 0);
+ assert(link->manager);
+ assert(link->manager->rtnl);
+ assert(req);
+
+ log_neighbor_debug(neighbor, "Configuring", link);
+
+ r = sd_rtnl_message_new_neigh(link->manager->rtnl, &m, RTM_NEWNEIGH,
+ link->ifindex, neighbor->family);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_message_neigh_set_state(m, NUD_PERMANENT);
+ if (r < 0)
+ return r;
+
+ r = netlink_message_append_hw_addr(m, NDA_LLADDR, &neighbor->ll_addr);
+ if (r < 0)
+ return r;
+
+ r = netlink_message_append_in_addr_union(m, NDA_DST, neighbor->family, &neighbor->in_addr);
+ if (r < 0)
+ return r;
+
+ return request_call_netlink_async(link->manager->rtnl, m, req);
+}
+
+static int neighbor_process_request(Request *req, Link *link, Neighbor *neighbor) {
+ Neighbor *existing;
+ int r;
+
+ assert(req);
+ assert(link);
+ assert(neighbor);
+
+ if (!link_is_ready_to_configure(link, false))
+ return 0;
+
+ r = neighbor_configure(neighbor, link, req);
+ if (r < 0)
+ return log_link_warning_errno(link, r, "Failed to configure neighbor: %m");
+
+ neighbor_enter_configuring(neighbor);
+ if (neighbor_get(link, neighbor, &existing) >= 0)
+ neighbor_enter_configuring(existing);
+
+ return 1;
+}
+
+static int static_neighbor_configure_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, Neighbor *neighbor) {
+ int r;
+
+ assert(m);
+ assert(link);
+
+ r = sd_netlink_message_get_errno(m);
+ if (r < 0 && r != -EEXIST) {
+ log_link_message_warning_errno(link, m, r, "Could not set neighbor");
+ link_enter_failed(link);
+ return 1;
+ }
+
+ if (link->static_neighbor_messages == 0) {
+ log_link_debug(link, "Neighbors set");
+ link->static_neighbors_configured = true;
+ link_check_ready(link);
+ }
+
+ return 1;
+}
+
+static int link_request_neighbor(Link *link, const Neighbor *neighbor) {
+ _cleanup_(neighbor_freep) Neighbor *tmp = NULL;
+ Neighbor *existing = NULL;
+ int r;
+
+ assert(link);
+ assert(neighbor);
+ assert(neighbor->source != NETWORK_CONFIG_SOURCE_FOREIGN);
+
+ if (neighbor->ll_addr.length != link->hw_addr.length) {
+ log_link_debug(link,
+ "The link layer address length (%zu) for neighbor %s does not match with "
+ "the hardware address length (%zu), ignoring the setting.",
+ neighbor->ll_addr.length,
+ IN_ADDR_TO_STRING(neighbor->family, &neighbor->in_addr),
+ link->hw_addr.length);
+ return 0;
+ }
+
+ r = neighbor_dup(neighbor, &tmp);
+ if (r < 0)
+ return r;
+
+ if (neighbor_get(link, neighbor, &existing) >= 0)
+ /* Copy state for logging below. */
+ tmp->state = existing->state;
+
+ log_neighbor_debug(tmp, "Requesting", link);
+ r = link_queue_request_safe(link, REQUEST_TYPE_NEIGHBOR,
+ tmp,
+ neighbor_free,
+ neighbor_hash_func,
+ neighbor_compare_func,
+ neighbor_process_request,
+ &link->static_neighbor_messages,
+ static_neighbor_configure_handler,
+ NULL);
+ if (r <= 0)
+ return r;
+
+ neighbor_enter_requesting(tmp);
+ if (existing)
+ neighbor_enter_requesting(existing);
+
+ TAKE_PTR(tmp);
+ return 1;
+}
+
+int link_request_static_neighbors(Link *link) {
+ Neighbor *neighbor;
+ int r;
+
+ assert(link);
+ assert(link->network);
+ assert(link->state != _LINK_STATE_INVALID);
+
+ link->static_neighbors_configured = false;
+
+ ORDERED_HASHMAP_FOREACH(neighbor, link->network->neighbors_by_section) {
+ r = link_request_neighbor(link, neighbor);
+ if (r < 0)
+ return log_link_warning_errno(link, r, "Could not request neighbor: %m");
+ }
+
+ if (link->static_neighbor_messages == 0) {
+ link->static_neighbors_configured = true;
+ link_check_ready(link);
+ } else {
+ log_link_debug(link, "Requesting neighbors");
+ link_set_state(link, LINK_STATE_CONFIGURING);
+ }
+
+ return 0;
+}
+
+static int neighbor_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
+ int r;
+
+ assert(m);
+ assert(link);
+
+ if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
+ return 1;
+
+ r = sd_netlink_message_get_errno(m);
+ if (r < 0 && r != -ESRCH)
+ /* Neighbor may not exist because it already got deleted, ignore that. */
+ log_link_message_warning_errno(link, m, r, "Could not remove neighbor");
+
+ return 1;
+}
+
+static int neighbor_remove(Neighbor *neighbor) {
+ _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
+ Request *req;
+ Link *link;
+ int r;
+
+ assert(neighbor);
+ assert(neighbor->link);
+ assert(neighbor->link->manager);
+ assert(neighbor->link->manager->rtnl);
+
+ link = neighbor->link;
+
+ log_neighbor_debug(neighbor, "Removing", link);
+
+ r = sd_rtnl_message_new_neigh(link->manager->rtnl, &m, RTM_DELNEIGH,
+ link->ifindex, neighbor->family);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not allocate RTM_DELNEIGH message: %m");
+
+ r = netlink_message_append_in_addr_union(m, NDA_DST, neighbor->family, &neighbor->in_addr);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not append NDA_DST attribute: %m");
+
+ r = netlink_call_async(link->manager->rtnl, NULL, m, neighbor_remove_handler,
+ link_netlink_destroy_callback, link);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
+
+ link_ref(link);
+
+ neighbor_enter_removing(neighbor);
+ if (neighbor_get_request(neighbor->link, neighbor, &req) >= 0)
+ neighbor_enter_removing(req->userdata);
+
+ return 0;
+}
+
+int link_drop_foreign_neighbors(Link *link) {
+ Neighbor *neighbor;
+ int r = 0;
+
+ assert(link);
+ assert(link->network);
+
+ /* First, mark all neighbors. */
+ SET_FOREACH(neighbor, link->neighbors) {
+ /* Do not remove neighbors we configured. */
+ if (neighbor->source != NETWORK_CONFIG_SOURCE_FOREIGN)
+ continue;
+
+ /* Ignore neighbors not assigned yet or already removing. */
+ if (!neighbor_exists(neighbor))
+ continue;
+
+ neighbor_mark(neighbor);
+ }
+
+ /* Next, unmark requested neighbors. They will be configured later. */
+ ORDERED_HASHMAP_FOREACH(neighbor, link->network->neighbors_by_section) {
+ Neighbor *existing;
+
+ if (neighbor_get(link, neighbor, &existing) >= 0)
+ neighbor_unmark(existing);
+ }
+
+ SET_FOREACH(neighbor, link->neighbors) {
+ if (!neighbor_is_marked(neighbor))
+ continue;
+
+ RET_GATHER(r, neighbor_remove(neighbor));
+ }
+
+ return r;
+}
+
+int link_drop_managed_neighbors(Link *link) {
+ Neighbor *neighbor;
+ int r = 0;
+
+ assert(link);
+
+ SET_FOREACH(neighbor, link->neighbors) {
+ /* Do not touch nexthops managed by kernel or other tools. */
+ if (neighbor->source == NETWORK_CONFIG_SOURCE_FOREIGN)
+ continue;
+
+ /* Ignore neighbors not assigned yet or already removing. */
+ if (!neighbor_exists(neighbor))
+ continue;
+
+ RET_GATHER(r, neighbor_remove(neighbor));
+ }
+
+ return r;
+}
+
+void link_foreignize_neighbors(Link *link) {
+ Neighbor *neighbor;
+
+ assert(link);
+
+ SET_FOREACH(neighbor, link->neighbors)
+ neighbor->source = NETWORK_CONFIG_SOURCE_FOREIGN;
+}
+
+int manager_rtnl_process_neighbor(sd_netlink *rtnl, sd_netlink_message *message, Manager *m) {
+ _cleanup_(neighbor_freep) Neighbor *tmp = NULL;
+ Neighbor *neighbor = NULL;
+ Request *req = NULL;
+ uint16_t type, state;
+ bool is_new = false;
+ int ifindex, r;
+ Link *link;
+
+ assert(rtnl);
+ assert(message);
+ assert(m);
+
+ if (sd_netlink_message_is_error(message)) {
+ r = sd_netlink_message_get_errno(message);
+ if (r < 0)
+ log_message_warning_errno(message, r, "rtnl: failed to receive neighbor message, ignoring");
+
+ return 0;
+ }
+
+ r = sd_netlink_message_get_type(message, &type);
+ if (r < 0) {
+ log_warning_errno(r, "rtnl: could not get message type, ignoring: %m");
+ return 0;
+ } else if (!IN_SET(type, RTM_NEWNEIGH, RTM_DELNEIGH)) {
+ log_warning("rtnl: received unexpected message type %u when processing neighbor, ignoring.", type);
+ return 0;
+ }
+
+ r = sd_rtnl_message_neigh_get_state(message, &state);
+ if (r < 0) {
+ log_warning_errno(r, "rtnl: received neighbor message with invalid state, ignoring: %m");
+ return 0;
+ } else if (!FLAGS_SET(state, NUD_PERMANENT)) {
+ log_debug("rtnl: received non-static neighbor, ignoring.");
+ return 0;
+ }
+
+ r = sd_rtnl_message_neigh_get_ifindex(message, &ifindex);
+ if (r < 0) {
+ log_warning_errno(r, "rtnl: could not get ifindex from message, ignoring: %m");
+ return 0;
+ } else if (ifindex <= 0) {
+ log_warning("rtnl: received neighbor message with invalid ifindex %d, ignoring.", ifindex);
+ return 0;
+ }
+
+ r = link_get_by_index(m, ifindex, &link);
+ if (r < 0) {
+ /* when enumerating we might be out of sync, but we will get the neighbor again. Also,
+ * kernel sends messages about neighbors after a link is removed. So, just ignore it. */
+ log_debug("rtnl: received neighbor for link '%d' we don't know about, ignoring.", ifindex);
+ return 0;
+ }
+
+ tmp = new0(Neighbor, 1);
+ if (!tmp)
+ return log_oom();
+
+ /* First, retrieve the fundamental information about the neighbor. */
+ r = sd_rtnl_message_neigh_get_family(message, &tmp->family);
+ if (r < 0) {
+ log_link_warning(link, "rtnl: received neighbor message without family, ignoring.");
+ return 0;
+ } else if (!IN_SET(tmp->family, AF_INET, AF_INET6)) {
+ log_link_debug(link, "rtnl: received neighbor message with invalid family '%i', ignoring.", tmp->family);
+ return 0;
+ }
+
+ r = netlink_message_read_in_addr_union(message, NDA_DST, tmp->family, &tmp->in_addr);
+ if (r < 0) {
+ log_link_warning_errno(link, r, "rtnl: received neighbor message without valid address, ignoring: %m");
+ return 0;
+ }
+
+ /* Then, find the managed Neighbor and Request objects corresponding to the netlink notification. */
+ (void) neighbor_get(link, tmp, &neighbor);
+ (void) neighbor_get_request(link, tmp, &req);
+
+ if (type == RTM_DELNEIGH) {
+ if (neighbor) {
+ neighbor_enter_removed(neighbor);
+ log_neighbor_debug(neighbor, "Forgetting removed", link);
+ neighbor_free(neighbor);
+ } else
+ log_neighbor_debug(tmp, "Kernel removed unknown", link);
+
+ if (req)
+ neighbor_enter_removed(req->userdata);
+
+ return 0;
+ }
+
+ /* If we did not know the neighbor, then save it. */
+ if (!neighbor) {
+ r = neighbor_add(link, tmp);
+ if (r < 0) {
+ log_link_warning_errno(link, r, "Failed to save received neighbor, ignoring: %m");
+ return 0;
+ }
+ neighbor = TAKE_PTR(tmp);
+ is_new = true;
+ }
+
+ /* Also update information that cannot be obtained through netlink notification. */
+ if (req && req->waiting_reply) {
+ Neighbor *n = ASSERT_PTR(req->userdata);
+
+ neighbor->source = n->source;
+ }
+
+ /* Then, update miscellaneous info. */
+ r = netlink_message_read_hw_addr(message, NDA_LLADDR, &neighbor->ll_addr);
+ if (r < 0 && r != -ENODATA)
+ log_link_debug_errno(link, r, "rtnl: received neighbor message without valid link layer address, ignoring: %m");
+
+ neighbor_enter_configured(neighbor);
+ if (req)
+ neighbor_enter_configured(req->userdata);
+
+ log_neighbor_debug(neighbor, is_new ? "Remembering" : "Received remembered", link);
+ return 1;
+}
+
+static int neighbor_section_verify(Neighbor *neighbor) {
+ if (section_is_invalid(neighbor->section))
+ return -EINVAL;
+
+ if (neighbor->family == AF_UNSPEC)
+ return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
+ "%s: Neighbor section without Address= configured. "
+ "Ignoring [Neighbor] section from line %u.",
+ neighbor->section->filename, neighbor->section->line);
+
+ if (neighbor->family == AF_INET6 && !socket_ipv6_is_supported())
+ return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
+ "%s: Neighbor section with an IPv6 destination address configured, "
+ "but the kernel does not support IPv6. "
+ "Ignoring [Neighbor] section from line %u.",
+ neighbor->section->filename, neighbor->section->line);
+
+ if (neighbor->ll_addr.length == 0)
+ return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
+ "%s: Neighbor section without LinkLayerAddress= configured. "
+ "Ignoring [Neighbor] section from line %u.",
+ neighbor->section->filename, neighbor->section->line);
+
+ return 0;
+}
+
+int network_drop_invalid_neighbors(Network *network) {
+ _cleanup_set_free_ Set *neighbors = NULL;
+ Neighbor *neighbor;
+ int r;
+
+ assert(network);
+
+ ORDERED_HASHMAP_FOREACH(neighbor, network->neighbors_by_section) {
+ Neighbor *dup;
+
+ if (neighbor_section_verify(neighbor) < 0) {
+ /* Drop invalid [Neighbor] sections. Note that neighbor_free() will drop the
+ * neighbor from neighbors_by_section. */
+ neighbor_free(neighbor);
+ continue;
+ }
+
+ /* Always use the setting specified later. So, remove the previously assigned setting. */
+ dup = set_remove(neighbors, neighbor);
+ if (dup) {
+ log_warning("%s: Duplicated neighbor settings for %s is specified at line %u and %u, "
+ "dropping the address setting specified at line %u.",
+ dup->section->filename,
+ IN_ADDR_TO_STRING(neighbor->family, &neighbor->in_addr),
+ neighbor->section->line,
+ dup->section->line, dup->section->line);
+ /* neighbor_free() will drop the address from neighbors_by_section. */
+ neighbor_free(dup);
+ }
+
+ /* Use neighbor_hash_ops, instead of neighbor_hash_ops_free. Otherwise, the Neighbor objects
+ * will be freed. */
+ r = set_ensure_put(&neighbors, &neighbor_hash_ops, neighbor);
+ if (r < 0)
+ return log_oom();
+ assert(r > 0);
+ }
+
+ return 0;
+}
+
+
+int config_parse_neighbor_address(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ _cleanup_(neighbor_free_or_set_invalidp) Neighbor *n = NULL;
+ Network *network = ASSERT_PTR(userdata);
+ int r;
+
+ assert(filename);
+ assert(section);
+ assert(lvalue);
+ assert(rvalue);
+
+ r = neighbor_new_static(network, filename, section_line, &n);
+ if (r < 0)
+ return log_oom();
+
+ if (isempty(rvalue)) {
+ n->family = AF_UNSPEC;
+ n->in_addr = IN_ADDR_NULL;
+ TAKE_PTR(n);
+ return 0;
+ }
+
+ r = in_addr_from_string_auto(rvalue, &n->family, &n->in_addr);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "Neighbor Address is invalid, ignoring assignment: %s", rvalue);
+ return 0;
+ }
+
+ TAKE_PTR(n);
+ return 0;
+}
+
+int config_parse_neighbor_lladdr(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ _cleanup_(neighbor_free_or_set_invalidp) Neighbor *n = NULL;
+ Network *network = ASSERT_PTR(userdata);
+ int r;
+
+ assert(filename);
+ assert(section);
+ assert(lvalue);
+ assert(rvalue);
+
+ r = neighbor_new_static(network, filename, section_line, &n);
+ if (r < 0)
+ return log_oom();
+
+ if (isempty(rvalue)) {
+ n->ll_addr = HW_ADDR_NULL;
+ TAKE_PTR(n);
+ return 0;
+ }
+
+ r = parse_hw_addr(rvalue, &n->ll_addr);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "Neighbor %s= is invalid, ignoring assignment: %s",
+ lvalue, rvalue);
+ return 0;
+ }
+
+ TAKE_PTR(n);
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-30 12:24:53 +0000