Fix RA lifetimes

diff --git a/src/router.c b/src/router.c
index 89b1c52..7e666f1 100644 (file)
--- a/src/router.c
+++ b/src/router.c
@@ -253,8 +253,10 @@ static uint64_t send_router_advert(struct interface *iface, const struct in6_add
                                addrs, ARRAY_SIZE(addrs));
 
                // Check default route
-               if (parse_routes(addrs, ipcnt) || iface->default_router > 1)
-                       adv.h.nd_ra_router_lifetime = 1;
+               if (iface->default_router > 1)
+                       adv.h.nd_ra_router_lifetime = htons(iface->default_router);
+               if (parse_routes(addrs, ipcnt))
+                       adv.h.nd_ra_router_lifetime = htons(1);
        }
 
        // Construct Prefix Information options
@@ -290,15 +292,16 @@ static uint64_t send_router_advert(struct interface *iface, const struct in6_add
                        p = &adv.prefix[cnt++];
                }
 
-               if (addr->preferred > 0) {
-                       if (minvalid > 1000ULL * addr->valid)
-                               minvalid = 1000ULL * addr->valid;
+               if (addr->preferred > 0 &&
+                               minvalid > 1000ULL * addr->valid)
+                       minvalid = 1000ULL * addr->valid;
 
-                       if (maxvalid < 1000ULL * addr->valid && (iface->default_router ||
-                                       (addr->addr.s6_addr[0] & 0xfe) != 0xfc))
-                               maxvalid = 1000ULL * addr->valid;
-               }
+               if (maxvalid < 1000ULL * addr->valid)
+                       maxvalid = 1000ULL * addr->valid;
 
+               if (((addr->addr.s6_addr[0] & 0xfe) != 0xfc || iface->default_router)
+                               && ntohs(adv.h.nd_ra_router_lifetime) < addr->valid)
+                       adv.h.nd_ra_router_lifetime = htons(addr->valid);
 
                odhcpd_bmemcpy(&p->nd_opt_pi_prefix, &addr->addr,
                                (iface->ra_advrouter) ? 128 : addr->prefix);
@@ -321,7 +324,7 @@ static uint64_t send_router_advert(struct interface *iface, const struct in6_add
                }
        }
 
-       if (!maxvalid && !iface->default_router && adv.h.nd_ra_router_lifetime) {
+       if (!iface->default_router && ntohs(adv.h.nd_ra_router_lifetime) == 1) {
                syslog(LOG_WARNING, "A default route is present but there is no public prefix "
                                "on %s thus we don't announce a default route!", iface->ifname);
                adv.h.nd_ra_router_lifetime = 0;
@@ -435,8 +438,6 @@ static uint64_t send_router_advert(struct interface *iface, const struct in6_add
        }
 
        minival = (maxival * 3) / 4;
-       if (adv.h.nd_ra_router_lifetime)
-               adv.h.nd_ra_router_lifetime = htons(maxvalid / 1000);
 
        search->lifetime = htonl(maxvalid / 1000);