Add default gateway and DHCP handling (not fully working yet because of a kernel...

[project/relayd.git] / route.c

diff --git a/route.c b/route.c
index c41100d..25f949e 100644 (file)
--- a/route.c
+++ b/route.c
@@ -42,7 +42,9 @@ static void rtnl_flush(void)
        close(fd);
 }
 
-static void rtnl_route_request(struct relayd_interface *rif, struct relayd_host *host, bool add)
+static void
+rtnl_route_request(struct relayd_interface *rif, struct relayd_host *host,
+                  struct relayd_route *route, bool add)
 {
        static struct {
                struct nlmsghdr nl;
@@ -59,10 +61,11 @@ static void rtnl_route_request(struct relayd_interface *rif, struct relayd_host
                        struct rtattr rta;
                        int ifindex;
                } __packed dev;
+               struct {
+                       struct rtattr rta;
+                       uint8_t ipaddr[4];
+               } __packed gw;
        } __packed req = {
-               .nl = {
-                       .nlmsg_len = sizeof(req),
-               },
                .rt = {
                        .rtm_family = AF_INET,
                        .rtm_dst_len = 32,
@@ -73,16 +76,19 @@ static void rtnl_route_request(struct relayd_interface *rif, struct relayd_host
                        .rta_len = sizeof(req.table),
                },
                .dst.rta = {
-                       .rta_type = RTA_DST,
                        .rta_len = sizeof(req.dst),
                },
                .dev.rta = {
                        .rta_type = RTA_OIF,
                        .rta_len = sizeof(req.dev),
                },
+               .gw.rta = {
+                       .rta_type = RTA_GATEWAY,
+                       .rta_len = sizeof(req.gw),
+               },
        };
+       int pktlen = sizeof(req);
 
-       memcpy(req.dst.ipaddr, host->ipaddr, sizeof(req.dst.ipaddr));
        req.dev.ifindex = host->rif->sll.sll_ifindex;
        req.table.table = rif->rt_table;
 
@@ -92,14 +98,40 @@ static void rtnl_route_request(struct relayd_interface *rif, struct relayd_host
                req.nl.nlmsg_flags |= NLM_F_CREATE | NLM_F_REPLACE;
 
                req.rt.rtm_protocol = RTPROT_BOOT;
-               req.rt.rtm_scope = RT_SCOPE_LINK;
+               if (route) {
+                       req.rt.rtm_scope = RT_SCOPE_UNIVERSE;
+               } else {
+                       req.rt.rtm_scope = RT_SCOPE_LINK;
+               }
                req.rt.rtm_type = RTN_UNICAST;
        } else {
                req.nl.nlmsg_type = RTM_DELROUTE;
                req.rt.rtm_scope = RT_SCOPE_NOWHERE;
        }
 
-       send(rtnl_sock.fd, &req, sizeof(req), 0);
+       req.dst.rta.rta_type = RTA_DST;
+       if (route) {
+               DPRINTF(2, "%s: add route to "IP_FMT"/%d via "IP_FMT"\n",
+                       host->rif->ifname, IP_BUF(route->dest), route->mask, IP_BUF(host->ipaddr));
+               if (!route->mask) {
+                       /* No DST -> reuse the DST attribute as the gateway attribute */
+                       memcpy(req.dst.ipaddr, host->ipaddr, sizeof(req.dst.ipaddr));
+                       req.dst.rta.rta_type = RTA_GATEWAY;
+                       pktlen -= sizeof(req.gw);
+                       req.rt.rtm_dst_len = 0;
+               } else {
+                       memcpy(req.gw.ipaddr, host->ipaddr, sizeof(req.gw.ipaddr));
+                       memcpy(req.dst.ipaddr, route->dest, sizeof(req.dst.ipaddr));
+                       req.rt.rtm_dst_len = route->mask;
+               }
+       } else {
+               pktlen -= sizeof(req.gw);
+               req.rt.rtm_dst_len = 32;
+               memcpy(req.dst.ipaddr, host->ipaddr, sizeof(req.dst.ipaddr));
+       }
+
+       req.nl.nlmsg_len = pktlen;
+       send(rtnl_sock.fd, &req, pktlen, 0);
        rtnl_flush();
 }
 
@@ -155,7 +187,8 @@ static void rtnl_rule_request(struct relayd_interface *rif, bool add)
        rtnl_flush();
 }
 
-void rtnl_route_set(struct relayd_host *host, bool add)
+void
+rtnl_route_set(struct relayd_host *host, struct relayd_route *route, bool add)
 {
        struct relayd_interface *rif;
 
@@ -163,7 +196,7 @@ void rtnl_route_set(struct relayd_host *host, bool add)
                if (rif == host->rif)
                        continue;
 
-               rtnl_route_request(rif, host, add);
+               rtnl_route_request(rif, host, route, add);
        }
 }