+ if (iface->ndp == RELAYD_RELAY) {
+ // Replay change to all neighbor cache
+ struct {
+ struct nlmsghdr nh;
+ struct ndmsg ndm;
+ struct nlattr nla_dst;
+ struct in6_addr dst;
+ } req = {
+ {sizeof(req), RTM_DELNEIGH, NLM_F_REQUEST,
+ ++rtnl_seqid, 0},
+ {.ndm_family = AF_INET6, .ndm_flags = NTF_PROXY},
+ {sizeof(struct nlattr) + sizeof(struct in6_addr), NDA_DST},
+ *addr
+ };
+
+ if (ndm->ndm_flags & NTF_PROXY) {
+ // Dump & flush proxy entries
+ if (nh->nlmsg_type == RTM_NEWNEIGH) {
+ req.ndm.ndm_ifindex = iface->ifindex;
+ send(rtnl_event.uloop.fd, &req, sizeof(req), MSG_DONTWAIT);
+ setup_route(addr, iface, false);
+ dump_neigh = true;
+ }
+ } else if (add) {
+ struct interface *c;
+ list_for_each_entry(c, &interfaces, head) {
+ if (iface == c)
+ continue;
+
+ if (c->ndp == RELAYD_RELAY) {
+ req.nh.nlmsg_type = RTM_NEWNEIGH;
+ req.nh.nlmsg_flags |= NLM_F_CREATE | NLM_F_REPLACE;
+
+ req.ndm.ndm_ifindex = c->ifindex;
+ send(rtnl_event.uloop.fd, &req, sizeof(req), MSG_DONTWAIT);
+ } else { // Delete NDP cache from interfaces without relay
+ req.nh.nlmsg_type = RTM_DELNEIGH;
+ req.nh.nlmsg_flags &= ~(NLM_F_CREATE | NLM_F_REPLACE);
+
+ req.ndm.ndm_ifindex = c->ifindex;
+ send(rtnl_event.uloop.fd, &req, sizeof(req), MSG_DONTWAIT);
+ }
+ }
+
+ setup_route(addr, iface, true);
+ } else {
+ if (nh->nlmsg_type == RTM_NEWNEIGH) {
+ // might be locally originating
+ if (!IN6_ARE_ADDR_EQUAL(&last_solicited, addr)) {
+ last_solicited = *addr;
+
+ struct interface *c;
+ list_for_each_entry(c, &interfaces, head)
+ if (iface->ndp == RELAYD_RELAY && iface != c &&
+ !c->external == false)
+ ping6(addr, c);
+ }
+ } else {
+ struct interface *c;
+ list_for_each_entry(c, &interfaces, head) {
+ if (c->ndp == RELAYD_RELAY && iface != c) {
+ req.ndm.ndm_ifindex = c->ifindex;
+ send(rtnl_event.uloop.fd, &req, sizeof(req), MSG_DONTWAIT);
+ }
+ }
+ setup_route(addr, iface, false);
+
+ // also: dump to add proxies back in case it moved elsewhere
+ dump_neigh = true;
+ }
+ }
+ }