- struct ortentry rt;
-
- SET_SA_FAMILY(rt.rt_dst, AF_INET);
- SET_SA_FAMILY(rt.rt_gateway, AF_INET);
- ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = g;
- rt.rt_flags = RTF_GATEWAY;
- if (ioctl(s, SIOCDELRT, &rt) < 0)
- syslog(LOG_WARNING, "default route ioctl(SIOCDELRT): %m");
+ int routes;
+ int l;
+
+ /*
+ * Get the hardware address of an interface on the same subnet
+ * as our local address.
+ */
+ memset(&arpmsg, 0, sizeof(arpmsg));
+ if (!get_ether_addr(hisaddr, &arpmsg.hwa)) {
+ syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP");
+ return 0;
+ }
+
+ if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
+ syslog(LOG_ERR, "sifproxyarp: opening routing socket: %m");
+ return 0;
+ }
+
+ arpmsg.hdr.rtm_type = RTM_ADD;
+ arpmsg.hdr.rtm_flags = RTF_ANNOUNCE | RTF_HOST | RTF_STATIC;
+ arpmsg.hdr.rtm_version = RTM_VERSION;
+ arpmsg.hdr.rtm_seq = ++rtm_seq;
+ arpmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY;
+ arpmsg.hdr.rtm_inits = RTV_EXPIRE;
+ arpmsg.dst.sin_len = sizeof(struct sockaddr_inarp);
+ arpmsg.dst.sin_family = AF_INET;
+ arpmsg.dst.sin_addr.s_addr = hisaddr;
+ arpmsg.dst.sin_other = SIN_PROXY;
+
+ arpmsg.hdr.rtm_msglen = (char *) &arpmsg.hwa - (char *) &arpmsg
+ + arpmsg.hwa.sdl_len;
+ if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
+ syslog(LOG_ERR, "add proxy arp entry: %m");
+ close(routes);
+ return 0;
+ }
+
+ close(routes);
+ arpmsg_valid = 1;
+ return 1;