Add support for (managed) prefixes of length 65-96

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

diff --git a/src/router.c b/src/router.c
index dfbcf60..907011a 100644 (file)
--- a/src/router.c
+++ b/src/router.c
@@ -273,6 +273,7 @@ static void send_router_advert(struct uloop_timeout *event)
        // If not currently shutting down
        struct odhcpd_ipaddr addrs[RELAYD_MAX_PREFIXES];
        ssize_t ipcnt = 0;
+       uint64_t maxpreferred = 0;
 
        // If not shutdown
        if (event->cb) {
@@ -295,7 +296,7 @@ static void send_router_advert(struct uloop_timeout *event)
 
        for (ssize_t i = 0; i < ipcnt; ++i) {
                struct odhcpd_ipaddr *addr = &addrs[i];
-               if (addr->prefix > 64 || addr->has_class)
+               if (addr->prefix > 96 || addr->has_class)
                        continue; // Address not suitable
 
                if (addr->preferred > MaxPreferredTime)
@@ -306,8 +307,9 @@ static void send_router_advert(struct uloop_timeout *event)
 
                struct nd_opt_prefix_info *p = NULL;
                for (size_t i = 0; i < cnt; ++i) {
-                       if (!memcmp(&adv.prefix[i].nd_opt_pi_prefix,
-                                       &addr->addr, 8))
+                       if (addr->prefix == adv.prefix[i].nd_opt_pi_prefix_len &&
+                                       !odhcpd_bmemcmp(&adv.prefix[i].nd_opt_pi_prefix,
+                                       &addr->addr, addr->prefix))
                                p = &adv.prefix[i];
                }
 
@@ -318,17 +320,21 @@ static void send_router_advert(struct uloop_timeout *event)
                        p = &adv.prefix[cnt++];
                }
 
-               if ((addr->addr.s6_addr[0] & 0xfe) != 0xfc && addr->preferred > 0)
+               if ((addr->addr.s6_addr[0] & 0xfe) != 0xfc && addr->preferred > 0) {
                        have_public = true;
 
-               memcpy(&p->nd_opt_pi_prefix, &addr->addr, 8);
+                       if (maxpreferred < 1000 * addr->preferred)
+                               maxpreferred = 1000 * addr->preferred;
+               }
+
+               odhcpd_bmemcpy(&p->nd_opt_pi_prefix, &addr->addr, addr->prefix);
                p->nd_opt_pi_type = ND_OPT_PREFIX_INFORMATION;
                p->nd_opt_pi_len = 4;
-               p->nd_opt_pi_prefix_len = 64;
+               p->nd_opt_pi_prefix_len = (addr->prefix < 64) ? 64 : addr->prefix;
                p->nd_opt_pi_flags_reserved = 0;
                if (!iface->ra_not_onlink)
                        p->nd_opt_pi_flags_reserved |= ND_OPT_PI_FLAG_ONLINK;
-               if (iface->managed < RELAYD_MANAGED_NO_AFLAG)
+               if (iface->managed < RELAYD_MANAGED_NO_AFLAG && addr->prefix <= 64)
                        p->nd_opt_pi_flags_reserved |= ND_OPT_PI_FLAG_AUTO;
                p->nd_opt_pi_valid_time = htonl(addr->valid);
                p->nd_opt_pi_preferred_time = htonl(addr->preferred);
@@ -453,10 +459,23 @@ static void send_router_advert(struct uloop_timeout *event)
 
        // Rearm timer if not shut down
        if (event->cb) {
+               uint32_t maxinterval = MaxRtrAdvInterval * 1000;
+               uint32_t mininterval = MinRtrAdvInterval * 1000;
+
+               if (maxpreferred > 0 && maxinterval > maxpreferred / 2) {
+                       maxinterval = maxpreferred / 2;
+                       if (maxinterval < 4000)
+                               maxinterval = 4000;
+
+                       if (maxinterval >= 9000)
+                               mininterval = maxinterval / 3;
+                       else
+                               mininterval = (maxinterval * 3) / 4;
+               }
+
                int msecs;
                odhcpd_urandom(&msecs, sizeof(msecs));
-               msecs = (labs(msecs) % (1000 * (MaxRtrAdvInterval
-                               - MinRtrAdvInterval))) + (MinRtrAdvInterval * 1000);
+               msecs = (labs(msecs) % (maxinterval - mininterval)) + mininterval;
                uloop_timeout_set(&iface->timer_rs, msecs);
        }
 }