498 lines
16 KiB
C
498 lines
16 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include "sd-netlink.h"
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#include "alloc-util.h"
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#include "conf-parser.h"
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#include "ether-addr-util.h"
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#include "hashmap.h"
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#include "in-addr-util.h"
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#include "netlink-util.h"
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#include "networkd-link.h"
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#include "networkd-manager.h"
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#include "networkd-neighbor.h"
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#include "set.h"
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void neighbor_free(Neighbor *neighbor) {
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if (!neighbor)
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return;
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if (neighbor->network) {
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LIST_REMOVE(neighbors, neighbor->network->neighbors, neighbor);
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assert(neighbor->network->n_neighbors > 0);
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neighbor->network->n_neighbors--;
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if (neighbor->section)
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hashmap_remove(neighbor->network->neighbors_by_section, neighbor->section);
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}
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network_config_section_free(neighbor->section);
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if (neighbor->link) {
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set_remove(neighbor->link->neighbors, neighbor);
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set_remove(neighbor->link->neighbors_foreign, neighbor);
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}
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free(neighbor);
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}
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static int neighbor_new_static(Network *network, const char *filename, unsigned section_line, Neighbor **ret) {
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_cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
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_cleanup_(neighbor_freep) Neighbor *neighbor = NULL;
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int r;
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assert(network);
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assert(ret);
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assert(!!filename == (section_line > 0));
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if (filename) {
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r = network_config_section_new(filename, section_line, &n);
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if (r < 0)
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return r;
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neighbor = hashmap_get(network->neighbors_by_section, n);
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if (neighbor) {
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*ret = TAKE_PTR(neighbor);
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return 0;
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}
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}
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neighbor = new(Neighbor, 1);
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if (!neighbor)
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return -ENOMEM;
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*neighbor = (Neighbor) {
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.network = network,
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.family = AF_UNSPEC,
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};
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LIST_APPEND(neighbors, network->neighbors, neighbor);
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network->n_neighbors++;
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if (filename) {
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neighbor->section = TAKE_PTR(n);
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r = hashmap_ensure_allocated(&network->neighbors_by_section, &network_config_hash_ops);
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if (r < 0)
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return r;
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r = hashmap_put(network->neighbors_by_section, neighbor->section, neighbor);
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if (r < 0)
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return r;
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}
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*ret = TAKE_PTR(neighbor);
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return 0;
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}
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static int neighbor_configure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
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int r;
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assert(m);
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assert(link);
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assert(link->neighbor_messages > 0);
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link->neighbor_messages--;
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if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
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return 1;
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r = sd_netlink_message_get_errno(m);
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if (r < 0 && r != -EEXIST)
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/* Neighbor may not exist yet. So, do not enter failed state here. */
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log_link_message_warning_errno(link, m, r, "Could not set neighbor, ignoring");
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if (link->neighbor_messages == 0) {
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log_link_debug(link, "Neighbors set");
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link->neighbors_configured = true;
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link_check_ready(link);
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}
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return 1;
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}
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int neighbor_configure(Neighbor *neighbor, Link *link, link_netlink_message_handler_t callback) {
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_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
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int r;
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assert(neighbor);
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assert(link);
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assert(link->ifindex > 0);
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assert(link->manager);
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assert(link->manager->rtnl);
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r = sd_rtnl_message_new_neigh(link->manager->rtnl, &req, RTM_NEWNEIGH,
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link->ifindex, neighbor->family);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not allocate RTM_NEWNEIGH message: %m");
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r = sd_rtnl_message_neigh_set_state(req, NUD_PERMANENT);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not set state: %m");
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r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not set flags: %m");
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r = sd_netlink_message_append_data(req, NDA_LLADDR, &neighbor->lladdr, neighbor->lladdr_size);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not append NDA_LLADDR attribute: %m");
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r = netlink_message_append_in_addr_union(req, NDA_DST, neighbor->family, &neighbor->in_addr);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not append NDA_DST attribute: %m");
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r = netlink_call_async(link->manager->rtnl, NULL, req, callback ?: neighbor_configure_handler,
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link_netlink_destroy_callback, link);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
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link->neighbor_messages++;
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link_ref(link);
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r = neighbor_add(link, neighbor->family, &neighbor->in_addr, &neighbor->lladdr, neighbor->lladdr_size, NULL);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not add neighbor: %m");
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return 0;
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}
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static int neighbor_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
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int r;
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assert(m);
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assert(link);
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if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
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return 1;
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r = sd_netlink_message_get_errno(m);
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if (r < 0 && r != -ESRCH)
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/* Neighbor may not exist because it already got deleted, ignore that. */
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log_link_message_warning_errno(link, m, r, "Could not remove neighbor");
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return 1;
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}
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int neighbor_remove(Neighbor *neighbor, Link *link, link_netlink_message_handler_t callback) {
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_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
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int r;
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assert(neighbor);
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assert(link);
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assert(link->ifindex > 0);
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assert(link->manager);
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assert(link->manager->rtnl);
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r = sd_rtnl_message_new_neigh(link->manager->rtnl, &req, RTM_DELNEIGH,
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link->ifindex, neighbor->family);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not allocate RTM_DELNEIGH message: %m");
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r = netlink_message_append_in_addr_union(req, NDA_DST, neighbor->family, &neighbor->in_addr);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not append NDA_DST attribute: %m");
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r = netlink_call_async(link->manager->rtnl, NULL, req, callback ?: neighbor_remove_handler,
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link_netlink_destroy_callback, link);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
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link_ref(link);
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return 0;
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}
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static void neighbor_hash_func(const Neighbor *neighbor, struct siphash *state) {
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assert(neighbor);
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siphash24_compress(&neighbor->family, sizeof(neighbor->family), state);
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siphash24_compress(&neighbor->lladdr_size, sizeof(neighbor->lladdr_size), state);
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switch (neighbor->family) {
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case AF_INET:
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case AF_INET6:
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/* Equality of neighbors are given by the pair (addr,lladdr) */
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siphash24_compress(&neighbor->in_addr, FAMILY_ADDRESS_SIZE(neighbor->family), state);
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break;
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default:
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/* treat any other address family as AF_UNSPEC */
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break;
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}
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siphash24_compress(&neighbor->lladdr, neighbor->lladdr_size, state);
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}
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static int neighbor_compare_func(const Neighbor *a, const Neighbor *b) {
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int r;
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r = CMP(a->family, b->family);
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if (r != 0)
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return r;
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r = CMP(a->lladdr_size, b->lladdr_size);
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if (r != 0)
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return r;
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switch (a->family) {
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case AF_INET:
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case AF_INET6:
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r = memcmp(&a->in_addr, &b->in_addr, FAMILY_ADDRESS_SIZE(a->family));
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if (r != 0)
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return r;
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}
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return memcmp(&a->lladdr, &b->lladdr, a->lladdr_size);
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}
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DEFINE_PRIVATE_HASH_OPS(neighbor_hash_ops, Neighbor, neighbor_hash_func, neighbor_compare_func);
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int neighbor_get(Link *link, int family, const union in_addr_union *addr, const union lladdr_union *lladdr, size_t lladdr_size, Neighbor **ret) {
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Neighbor neighbor, *existing;
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assert(link);
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assert(addr);
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assert(lladdr);
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neighbor = (Neighbor) {
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.family = family,
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.in_addr = *addr,
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.lladdr = *lladdr,
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.lladdr_size = lladdr_size,
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};
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existing = set_get(link->neighbors, &neighbor);
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if (existing) {
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if (ret)
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*ret = existing;
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return 1;
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}
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existing = set_get(link->neighbors_foreign, &neighbor);
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if (existing) {
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if (ret)
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*ret = existing;
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return 0;
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}
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return -ENOENT;
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}
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static int neighbor_add_internal(Link *link, Set **neighbors, int family, const union in_addr_union *addr, const union lladdr_union *lladdr, size_t lladdr_size, Neighbor **ret) {
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_cleanup_(neighbor_freep) Neighbor *neighbor = NULL;
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int r;
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assert(link);
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assert(neighbors);
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assert(addr);
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assert(lladdr);
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neighbor = new(Neighbor, 1);
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if (!neighbor)
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return -ENOMEM;
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*neighbor = (Neighbor) {
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.family = family,
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.in_addr = *addr,
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.lladdr = *lladdr,
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.lladdr_size = lladdr_size,
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};
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r = set_ensure_put(neighbors, &neighbor_hash_ops, neighbor);
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if (r < 0)
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return r;
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if (r == 0)
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return -EEXIST;
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neighbor->link = link;
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if (ret)
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*ret = neighbor;
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TAKE_PTR(neighbor);
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return 0;
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}
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int neighbor_add(Link *link, int family, const union in_addr_union *addr, const union lladdr_union *lladdr, size_t lladdr_size, Neighbor **ret) {
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Neighbor *neighbor;
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int r;
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r = neighbor_get(link, family, addr, lladdr, lladdr_size, &neighbor);
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if (r == -ENOENT) {
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/* Neighbor doesn't exist, make a new one */
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r = neighbor_add_internal(link, &link->neighbors, family, addr, lladdr, lladdr_size, &neighbor);
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if (r < 0)
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return r;
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} else if (r == 0) {
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/* Neighbor is foreign, claim it as recognized */
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r = set_ensure_put(&link->neighbors, &neighbor_hash_ops, neighbor);
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if (r < 0)
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return r;
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set_remove(link->neighbors_foreign, neighbor);
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} else if (r == 1) {
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/* Neighbor already exists */
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} else
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return r;
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if (ret)
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*ret = neighbor;
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return 0;
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}
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int neighbor_add_foreign(Link *link, int family, const union in_addr_union *addr, const union lladdr_union *lladdr, size_t lladdr_size, Neighbor **ret) {
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return neighbor_add_internal(link, &link->neighbors_foreign, family, addr, lladdr, lladdr_size, ret);
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}
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bool neighbor_equal(const Neighbor *n1, const Neighbor *n2) {
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if (n1 == n2)
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return true;
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if (!n1 || !n2)
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return false;
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return neighbor_compare_func(n1, n2) == 0;
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}
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int neighbor_section_verify(Neighbor *neighbor) {
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if (section_is_invalid(neighbor->section))
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return -EINVAL;
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if (neighbor->family == AF_UNSPEC)
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return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
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"%s: Neighbor section without Address= configured. "
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"Ignoring [Neighbor] section from line %u.",
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neighbor->section->filename, neighbor->section->line);
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if (neighbor->lladdr_size == 0)
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return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
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"%s: Neighbor section without LinkLayerAddress= configured. "
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"Ignoring [Neighbor] section from line %u.",
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neighbor->section->filename, neighbor->section->line);
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return 0;
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}
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int config_parse_neighbor_address(
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const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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Network *network = userdata;
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_cleanup_(neighbor_free_or_set_invalidp) Neighbor *n = NULL;
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int r;
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assert(filename);
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assert(section);
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assert(lvalue);
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assert(rvalue);
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assert(data);
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r = neighbor_new_static(network, filename, section_line, &n);
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if (r < 0)
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return r;
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r = in_addr_from_string_auto(rvalue, &n->family, &n->in_addr);
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if (r < 0) {
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log_syntax(unit, LOG_ERR, filename, line, r, "Neighbor Address is invalid, ignoring assignment: %s", rvalue);
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return 0;
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}
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TAKE_PTR(n);
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return 0;
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}
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int config_parse_neighbor_lladdr(
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const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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Network *network = userdata;
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_cleanup_(neighbor_free_or_set_invalidp) Neighbor *n = NULL;
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int family, r;
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assert(filename);
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assert(section);
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assert(lvalue);
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assert(rvalue);
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assert(data);
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r = neighbor_new_static(network, filename, section_line, &n);
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if (r < 0)
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return r;
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r = ether_addr_from_string(rvalue, &n->lladdr.mac);
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if (r >= 0)
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n->lladdr_size = sizeof(n->lladdr.mac);
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else {
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r = in_addr_from_string_auto(rvalue, &family, &n->lladdr.ip);
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if (r < 0) {
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log_syntax(unit, LOG_ERR, filename, line, r,
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"Neighbor LinkLayerAddress= is invalid, ignoring assignment: %s",
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rvalue);
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return 0;
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}
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n->lladdr_size = family == AF_INET ? sizeof(n->lladdr.ip.in) : sizeof(n->lladdr.ip.in6);
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}
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TAKE_PTR(n);
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return 0;
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}
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int config_parse_neighbor_hwaddr(
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const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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Network *network = userdata;
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_cleanup_(neighbor_free_or_set_invalidp) Neighbor *n = NULL;
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int r;
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assert(filename);
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assert(section);
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assert(lvalue);
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assert(rvalue);
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assert(data);
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r = neighbor_new_static(network, filename, section_line, &n);
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if (r < 0)
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return r;
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r = ether_addr_from_string(rvalue, &n->lladdr.mac);
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if (r < 0) {
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log_syntax(unit, LOG_ERR, filename, line, r,
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"Neighbor MACAddress= is invalid, ignoring assignment: %s", rvalue);
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return 0;
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}
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n->lladdr_size = sizeof(n->lladdr.mac);
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TAKE_PTR(n);
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return 0;
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}
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