Remove "owned" routes

For now, owned routes are simply routes that have protocol 72 on Linux,
or PROTO3 flag on BSD. This first implementation removes all owned routes
when ndppd starts. #32

src/ndppd.c

@@ -208,17 +208,17 @@ int main(int argc, char *argv[])
         return -1;
 
     nd_rt_query_routes();
-
-    bool query_addresses = false;
+    bool querying_routes = true;
 
     while (1)
     {
         if (nd_current_time >= nd_rt_dump_timeout)
             nd_rt_dump_timeout = 0;
 
-        if (!query_addresses && !nd_rt_dump_timeout)
+        if (querying_routes && !nd_rt_dump_timeout)
         {
-            query_addresses = true;
+            querying_routes = false;
+            nl_rt_remove_owned_routes();
             nd_rt_query_addresses();
         }
 

src/rt.c

@@ -45,9 +45,6 @@ static nd_io_t *ndL_io;
 // All IPV6 routes on the system.
 static nd_rt_route_t *ndL_routes;
 
-// All routes that have been created by ndppd.
-__attribute__((unused)) static nd_rt_route_t *ndL_owned_routes;
-
 // Freelist.
 static nd_rt_route_t *ndL_free_routes;
 
@@ -576,6 +573,8 @@ bool nd_rt_add_route(nd_addr_t *dst, unsigned pflen, unsigned oif, unsigned tabl
         uint32_t oif;
         struct rtattr dst_attr __attribute__((aligned(RTA_ALIGNTO)));
         nd_addr_t dst;
+        //struct rtattr exp_attr __attribute__((aligned(RTA_ALIGNTO)));
+        //uint32_t exp;
     } req;
 
     memset(&req, 0, sizeof(req));
@@ -589,10 +588,15 @@ bool nd_rt_add_route(nd_addr_t *dst, unsigned pflen, unsigned oif, unsigned tabl
     req.oif_attr.rta_type = RTA_OIF;
     req.oif_attr.rta_len = RTA_LENGTH(sizeof(req.oif));
     req.oif = oif;
+
     req.dst_attr.rta_type = RTA_DST;
     req.dst_attr.rta_len = RTA_LENGTH(sizeof(req.dst));
     req.dst = *dst;
 
+    //req.exp_attr.rta_type = RTA_EXPIRES;
+    //req.exp_attr.rta_len = RTA_LENGTH(sizeof(req.exp));
+    //req.exp = 60;
+
     req.hdr.nlmsg_type = RTM_NEWROUTE;
     req.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE;
     req.hdr.nlmsg_len = sizeof(req);
@@ -620,6 +624,7 @@ bool nd_rt_add_route(nd_addr_t *dst, unsigned pflen, unsigned oif, unsigned tabl
     msg.hdr.rtm_msglen = sizeof(msg);
     msg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
     msg.hdr.rtm_index = oif;
+
 #    ifdef __FreeBSD__
     (void)table;
 #    else
@@ -688,6 +693,7 @@ bool nd_rt_remove_route(nd_addr_t *dst, unsigned pflen, unsigned table)
     req.hdr.rtm_pid = getpid();
     req.hdr.rtm_msglen = sizeof(req);
     req.hdr.rtm_addrs = RTA_DST | RTA_NETMASK;
+
 #    ifdef __FreeBSD__
     (void)table;
 #    else
@@ -702,6 +708,17 @@ bool nd_rt_remove_route(nd_addr_t *dst, unsigned pflen, unsigned table)
     req.mask.sin6_len = sizeof(req.mask);
     nd_mask_from_pflen(pflen, &req.mask.sin6_addr);
 
+    nd_log_info("rt: Removing route %s/%d table %d", nd_aton(dst), pflen, table);
+
     return nd_io_write(ndL_io, &req, sizeof(req)) >= 0;
 #endif
 }
+
+void nl_rt_remove_owned_routes()
+{
+    ND_LL_FOREACH_S(ndL_routes, route, tmp, next)
+    {
+        if (route->owned)
+            nd_rt_remove_route(&route->dst, route->pflen, route->table);
+    }
+}

src/rt.h

@@ -49,5 +49,6 @@ bool nd_rt_query_routes();
 nd_rt_route_t *nd_rt_find_route(nd_addr_t *addr, unsigned table);
 bool nd_rt_add_route(nd_addr_t *dst, unsigned pflen, unsigned oif, unsigned table);
 bool nd_rt_remove_route(nd_addr_t *dst, unsigned pflen, unsigned table);
+void nl_rt_remove_owned_routes();
 
 #endif // NDPPD_RT_H