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-rw-r--r--src/network/networkd-neighbor.c237
1 files changed, 237 insertions, 0 deletions
diff --git a/src/network/networkd-neighbor.c b/src/network/networkd-neighbor.c
new file mode 100644
index 0000000..254a60b
--- /dev/null
+++ b/src/network/networkd-neighbor.c
@@ -0,0 +1,237 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include "sd-netlink.h"
+
+#include "alloc-util.h"
+#include "conf-parser.h"
+#include "ether-addr-util.h"
+#include "hashmap.h"
+#include "in-addr-util.h"
+#include "netlink-util.h"
+#include "networkd-link.h"
+#include "networkd-manager.h"
+#include "networkd-neighbor.h"
+
+void neighbor_free(Neighbor *neighbor) {
+ if (!neighbor)
+ return;
+
+ if (neighbor->network) {
+ LIST_REMOVE(neighbors, neighbor->network->neighbors, neighbor);
+ assert(neighbor->network->n_neighbors > 0);
+ neighbor->network->n_neighbors--;
+
+ if (neighbor->section) {
+ hashmap_remove(neighbor->network->neighbors_by_section, neighbor->section);
+ network_config_section_free(neighbor->section);
+ }
+ }
+
+ free(neighbor);
+}
+
+static int neighbor_new_static(Network *network, const char *filename, unsigned section_line, Neighbor **ret) {
+ _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
+ _cleanup_(neighbor_freep) Neighbor *neighbor = NULL;
+ int r;
+
+ assert(network);
+ assert(ret);
+ assert(!!filename == (section_line > 0));
+
+ if (filename) {
+ r = network_config_section_new(filename, section_line, &n);
+ if (r < 0)
+ return r;
+
+ neighbor = 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,
+ };
+
+ LIST_APPEND(neighbors, network->neighbors, neighbor);
+ network->n_neighbors++;
+
+ if (filename) {
+ neighbor->section = TAKE_PTR(n);
+
+ r = hashmap_ensure_allocated(&network->neighbors_by_section, &network_config_hash_ops);
+ if (r < 0)
+ return r;
+
+ r = hashmap_put(network->neighbors_by_section, neighbor->section, neighbor);
+ if (r < 0)
+ return r;
+ }
+
+ *ret = TAKE_PTR(neighbor);
+
+ return 0;
+}
+
+static int neighbor_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
+ int r;
+
+ assert(link);
+ assert(link->neighbor_messages > 0);
+
+ link->neighbor_messages--;
+
+ if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
+ return 1;
+
+ r = sd_netlink_message_get_errno(m);
+ if (r < 0 && r != -EEXIST)
+ log_link_warning_errno(link, r, "Could not set neighbor: %m");
+
+ if (link->neighbor_messages == 0) {
+ log_link_debug(link, "Neighbors set");
+ link->neighbors_configured = true;
+ link_check_ready(link);
+ }
+
+ return 1;
+}
+
+int neighbor_configure(Neighbor *neighbor, Link *link, link_netlink_message_handler_t callback) {
+ _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
+ int r;
+
+ assert(neighbor);
+ assert(link);
+ assert(link->ifindex > 0);
+ assert(link->manager);
+ assert(link->manager->rtnl);
+
+ if (neighbor->family == AF_UNSPEC)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Neighbor without Address= configured");
+ if (!neighbor->mac_configured)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Neighbor without MACAddress= configured");
+
+ r = sd_rtnl_message_new_neigh(link->manager->rtnl, &req, RTM_NEWNEIGH,
+ link->ifindex, neighbor->family);
+ if (r < 0)
+ return log_error_errno(r, "Could not allocate RTM_NEWNEIGH message: %m");
+
+ r = sd_rtnl_message_neigh_set_state(req, NUD_PERMANENT);
+ if (r < 0)
+ return log_error_errno(r, "Could not set state: %m");
+
+ r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE);
+ if (r < 0)
+ return log_error_errno(r, "Could not set flags: %m");
+
+ r = sd_netlink_message_append_ether_addr(req, NDA_LLADDR, &neighbor->mac);
+ if (r < 0)
+ return log_error_errno(r, "Could not append NDA_LLADDR attribute: %m");
+
+ switch (neighbor->family) {
+ case AF_INET6:
+ r = sd_netlink_message_append_in6_addr(req, NDA_DST, &neighbor->in_addr.in6);
+ if (r < 0)
+ return log_error_errno(r, "Could not append NDA_DST attribute: %m");
+ break;
+ case AF_INET:
+ r = sd_netlink_message_append_in_addr(req, NDA_DST, &neighbor->in_addr.in);
+ if (r < 0)
+ return log_error_errno(r, "Could not append NDA_DST attribute: %m");
+ break;
+ default:
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Neighbor with invalid address family");
+ }
+
+ r = netlink_call_async(link->manager->rtnl, NULL, req, callback ?: neighbor_handler,
+ link_netlink_destroy_callback, link);
+ if (r < 0)
+ return log_error_errno(r, "Could not send rtnetlink message: %m");
+
+ link->neighbor_messages++;
+ link_ref(link);
+
+ 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) {
+
+ Network *network = userdata;
+ _cleanup_(neighbor_freep) Neighbor *n = NULL;
+ int r;
+
+ assert(filename);
+ assert(section);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ r = neighbor_new_static(network, filename, section_line, &n);
+ if (r < 0)
+ return r;
+
+ r = in_addr_from_string_auto(rvalue, &n->family, &n->in_addr);
+ if (r < 0) {
+ log_syntax(unit, LOG_ERR, filename, line, r, "Neighbor Address is invalid, ignoring assignment: %s", rvalue);
+ return 0;
+ }
+
+ TAKE_PTR(n);
+
+ return 0;
+}
+
+int config_parse_neighbor_hwaddr(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) {
+
+ Network *network = userdata;
+ _cleanup_(neighbor_freep) Neighbor *n = NULL;
+ int r;
+
+ assert(filename);
+ assert(section);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ r = neighbor_new_static(network, filename, section_line, &n);
+ if (r < 0)
+ return r;
+
+ r = ether_addr_from_string(rvalue, &n->mac);
+ if (r < 0) {
+ log_syntax(unit, LOG_ERR, filename, line, r, "Neighbor MACAddress is invalid, ignoring assignment: %s", rvalue);
+ return 0;
+ }
+
+ n->mac_configured = true;
+ TAKE_PTR(n);
+
+ return 0;
+}
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