config: limit ra_mtu to 65535

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

diff --git a/src/router.c b/src/router.c
index feae5c7..f08a7b0 100644 (file)
--- a/src/router.c
+++ b/src/router.c
@@ -259,12 +259,18 @@ static uint16_t calc_ra_lifetime(struct interface *iface, uint32_t maxival)
 static uint64_t send_router_advert(struct interface *iface, const struct in6_addr *from)
 {
        time_t now = odhcpd_time();
-       int mtu = odhcpd_get_interface_config(iface->ifname, "mtu");
-       int hlim = odhcpd_get_interface_config(iface->ifname, "hop_limit");
+       int mtu = iface->ra_mtu;
+       int hlim = iface->ra_hoplimit;
+
+       if (mtu == 0)
+               mtu = odhcpd_get_interface_config(iface->ifname, "mtu");
 
        if (mtu < 1280)
                mtu = 1280;
 
+       if (hlim == 0)
+               hlim = odhcpd_get_interface_config(iface->ifname, "hop_limit");
+
        struct {
                struct nd_router_advert h;
                struct icmpv6_opt lladdr;
@@ -289,6 +295,10 @@ static uint64_t send_router_advert(struct interface *iface, const struct in6_add
                adv.h.nd_ra_flags_reserved |= ND_RA_PREF_LOW;
        else if (iface->route_preference > 0)
                adv.h.nd_ra_flags_reserved |= ND_RA_PREF_HIGH;
+
+       adv.h.nd_ra_reachable = htonl(iface->ra_reachabletime);
+       adv.h.nd_ra_retransmit = htonl(iface->ra_retranstime);
+
        odhcpd_get_mac(iface, adv.lladdr.data);
 
        // If not currently shutting down