router: also send RAs to every known neighbor

[project/odhcpd.git] / src / odhcpd.c

diff --git a/src/odhcpd.c b/src/odhcpd.c
index aad5b37..3fb3009 100644 (file)
--- a/src/odhcpd.c
+++ b/src/odhcpd.c
@@ -194,6 +194,61 @@ ssize_t odhcpd_send(int socket, struct sockaddr_in6 *dest,
 }
 
 
+int odhcpd_iterate_interface_neighbors(const struct interface *iface,
+               void(*cb_neigh)(const struct in6_addr *addr,
+                               const struct interface *iface, void *data), void *data)
+{
+       struct {
+               struct nlmsghdr nhm;
+               struct ndmsg ndm;
+       } req = {{sizeof(req), RTM_GETNEIGH, NLM_F_REQUEST | NLM_F_DUMP,
+                       ++rtnl_seq, 0}, {AF_INET6, 0, 0, iface->ifindex, 0, 0, 0}};
+
+       if (send(rtnl_socket, &req, sizeof(req), 0) < (ssize_t)sizeof(req))
+               return -1;
+
+       uint8_t buf[8192];
+       ssize_t len = 0;
+
+       for (struct nlmsghdr *nhm = NULL; ; nhm = NLMSG_NEXT(nhm, len)) {
+               while (len < 0 || !NLMSG_OK(nhm, (size_t)len)) {
+                       len = recv(rtnl_socket, buf, sizeof(buf), 0);
+                       nhm = (struct nlmsghdr*)buf;
+                       if (len < 0 || !NLMSG_OK(nhm, (size_t)len)) {
+                               if (errno == EINTR)
+                                       continue;
+                               else
+                                       return -1;
+                       }
+               }
+
+               if (nhm->nlmsg_type != RTM_NEWNEIGH)
+                       break;
+
+               struct ndmsg *ndm = NLMSG_DATA(nhm);
+               if (ndm->ndm_ifindex != iface->ifindex ||
+                               (ndm->ndm_state & NUD_FAILED))
+                       continue;
+
+               struct rtattr *rta = (struct rtattr*)&ndm[1];
+               size_t alen = NLMSG_PAYLOAD(nhm, sizeof(*ndm));
+
+               while (RTA_OK(rta, alen)) {
+                       if (rta->rta_type == NDA_DST) {
+                               // TODO
+                               cb_neigh(NULL, iface, data);
+                               break;
+                       } else {
+                               rta = RTA_NEXT(rta, alen);
+                       }
+               }
+
+       }
+
+       return 0;
+}
+
+
 // Detect an IPV6-address currently assigned to the given interface
 ssize_t odhcpd_get_interface_addresses(int ifindex,
                struct odhcpd_ipaddr *addrs, size_t cnt)