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-rw-r--r--src/network/networkd-ipv6-proxy-ndp.c180
1 files changed, 180 insertions, 0 deletions
diff --git a/src/network/networkd-ipv6-proxy-ndp.c b/src/network/networkd-ipv6-proxy-ndp.c
new file mode 100644
index 0000000..edd369a
--- /dev/null
+++ b/src/network/networkd-ipv6-proxy-ndp.c
@@ -0,0 +1,180 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <netinet/in.h>
+#include <linux/if.h>
+
+#include "netlink-util.h"
+#include "networkd-ipv6-proxy-ndp.h"
+#include "networkd-link.h"
+#include "networkd-manager.h"
+#include "networkd-network.h"
+#include "networkd-queue.h"
+#include "socket-util.h"
+#include "string-util.h"
+
+void network_adjust_ipv6_proxy_ndp(Network *network) {
+ assert(network);
+
+ if (set_isempty(network->ipv6_proxy_ndp_addresses))
+ return;
+
+ if (!socket_ipv6_is_supported()) {
+ log_once(LOG_WARNING,
+ "%s: IPv6 proxy NDP addresses are set, but IPv6 is not supported by kernel, "
+ "Ignoring IPv6 proxy NDP addresses.", network->filename);
+ network->ipv6_proxy_ndp_addresses = set_free_free(network->ipv6_proxy_ndp_addresses);
+ }
+}
+
+static int ipv6_proxy_ndp_address_configure_handler(
+ sd_netlink *rtnl,
+ sd_netlink_message *m,
+ Request *req,
+ Link *link,
+ struct in6_addr *address) {
+
+ int r;
+
+ assert(m);
+ assert(link);
+
+ r = sd_netlink_message_get_errno(m);
+ if (r < 0)
+ log_link_message_warning_errno(link, m, r, "Could not add IPv6 proxy ndp address entry, ignoring");
+
+ if (link->static_ipv6_proxy_ndp_messages == 0) {
+ log_link_debug(link, "IPv6 proxy NDP addresses set.");
+ link->static_ipv6_proxy_ndp_configured = true;
+ link_check_ready(link);
+ }
+
+ return 1;
+}
+
+/* send a request to the kernel to add an IPv6 Proxy entry to the neighbour table */
+static int ipv6_proxy_ndp_address_configure(const struct in6_addr *address, Link *link, Request *req) {
+ _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
+ int r;
+
+ assert(address);
+ assert(link);
+ assert(link->manager);
+ assert(link->manager->rtnl);
+ assert(req);
+
+ /* create new netlink message */
+ r = sd_rtnl_message_new_neigh(link->manager->rtnl, &m, RTM_NEWNEIGH, link->ifindex, AF_INET6);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_message_neigh_set_flags(m, NTF_PROXY);
+ if (r < 0)
+ return r;
+
+ r = sd_netlink_message_append_in6_addr(m, NDA_DST, address);
+ if (r < 0)
+ return r;
+
+ return request_call_netlink_async(link->manager->rtnl, m, req);
+}
+
+static int ipv6_proxy_ndp_address_process_request(Request *req, Link *link, struct in6_addr *address) {
+ int r;
+
+ assert(req);
+ assert(link);
+ assert(address);
+
+ if (!link_is_ready_to_configure(link, false))
+ return 0;
+
+ r = ipv6_proxy_ndp_address_configure(address, link, req);
+ if (r < 0)
+ return log_link_warning_errno(link, r, "Failed to configure IPv6 proxy NDP address: %m");
+
+ return 1;
+}
+
+int link_request_static_ipv6_proxy_ndp_addresses(Link *link) {
+ struct in6_addr *address;
+ int r;
+
+ assert(link);
+ assert(link->network);
+
+ link->static_ipv6_proxy_ndp_configured = false;
+
+ SET_FOREACH(address, link->network->ipv6_proxy_ndp_addresses) {
+ r = link_queue_request_safe(link, REQUEST_TYPE_IPV6_PROXY_NDP,
+ address, NULL,
+ in6_addr_hash_func,
+ in6_addr_compare_func,
+ ipv6_proxy_ndp_address_process_request,
+ &link->static_ipv6_proxy_ndp_messages,
+ ipv6_proxy_ndp_address_configure_handler,
+ NULL);
+ if (r < 0)
+ return log_link_warning_errno(link, r, "Failed to request IPv6 proxy NDP address: %m");
+ }
+
+ if (link->static_ipv6_proxy_ndp_messages == 0) {
+ link->static_ipv6_proxy_ndp_configured = true;
+ link_check_ready(link);
+ } else {
+ log_link_debug(link, "Setting IPv6 proxy NDP addresses.");
+ link_set_state(link, LINK_STATE_CONFIGURING);
+ }
+
+ return 0;
+}
+
+int config_parse_ipv6_proxy_ndp_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_free_ struct in6_addr *address = NULL;
+ Network *network = ASSERT_PTR(userdata);
+ union in_addr_union buffer;
+ int r;
+
+ assert(filename);
+ assert(rvalue);
+
+ if (isempty(rvalue)) {
+ network->ipv6_proxy_ndp_addresses = set_free_free(network->ipv6_proxy_ndp_addresses);
+ return 0;
+ }
+
+ r = in_addr_from_string(AF_INET6, rvalue, &buffer);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "Failed to parse IPv6 proxy NDP address, ignoring: %s", rvalue);
+ return 0;
+ }
+
+ if (in_addr_is_null(AF_INET6, &buffer)) {
+ log_syntax(unit, LOG_WARNING, filename, line, 0,
+ "IPv6 proxy NDP address cannot be the ANY address, ignoring: %s", rvalue);
+ return 0;
+ }
+
+ address = newdup(struct in6_addr, &buffer.in6, 1);
+ if (!address)
+ return log_oom();
+
+ r = set_ensure_put(&network->ipv6_proxy_ndp_addresses, &in6_addr_hash_ops, address);
+ if (r < 0)
+ return log_oom();
+ if (r > 0)
+ TAKE_PTR(address);
+
+ return 0;
+}