treewide: define and use macro IN6_IS_ADDR_ULA
[project/odhcpd.git] / src / router.c
index 9907824..36267be 100644 (file)
@@ -20,6 +20,7 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <stdbool.h>
+#include <arpa/inet.h>
 #include <net/route.h>
 
 #include "router.h"
@@ -34,7 +35,7 @@ static void handle_icmpv6(void *addr, void *data, size_t len,
 static void trigger_router_advert(struct uloop_timeout *event);
 static void sigusr1_refresh(int signal);
 
-static struct odhcpd_event router_event = {{.fd = -1}, handle_icmpv6, NULL};
+static struct odhcpd_event router_event = {.uloop = {.fd = -1}, .handle_dgram = handle_icmpv6, };
 
 static FILE *fp_route = NULL;
 #define RA_IOV_LEN 6
@@ -99,6 +100,9 @@ int setup_router_interface(struct interface *iface, bool enable)
        uloop_timeout_cancel(&iface->timer_rs);
        iface->timer_rs.cb = NULL;
 
+       if (iface->ifindex <= 0)
+               return -1;
+
        setsockopt(router_event.uloop.fd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP,
                        &all_nodes, sizeof(all_nodes));
        setsockopt(router_event.uloop.fd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP,
@@ -244,7 +248,7 @@ static uint64_t send_router_advert(struct interface *iface, const struct in6_add
        odhcpd_get_mac(iface, adv.lladdr.data);
 
        // If not currently shutting down
-       struct odhcpd_ipaddr addrs[8];
+       struct odhcpd_ipaddr addrs[RELAYD_MAX_ADDRS];
        ssize_t ipcnt = 0;
        int64_t minvalid = INT64_MAX;
 
@@ -254,10 +258,13 @@ static uint64_t send_router_advert(struct interface *iface, const struct in6_add
                memcpy(addrs, iface->ia_addr, ipcnt * sizeof(*addrs));
 
                // Check default route
-               if (parse_routes(addrs, ipcnt))
-                       adv.h.nd_ra_router_lifetime = htons(1);
                if (iface->default_router > 1)
                        adv.h.nd_ra_router_lifetime = htons(iface->default_router);
+               else if (parse_routes(addrs, ipcnt))
+                       adv.h.nd_ra_router_lifetime = htons(1);
+
+               syslog(LOG_INFO, "Initial RA router lifetime %d, %d address(es) available on %s",
+                               ntohs(adv.h.nd_ra_router_lifetime), (int)ipcnt, iface->ifname);
        }
 
        // Construct Prefix Information options
@@ -270,8 +277,15 @@ static uint64_t send_router_advert(struct interface *iface, const struct in6_add
 
        for (ssize_t i = 0; i < ipcnt; ++i) {
                struct odhcpd_ipaddr *addr = &addrs[i];
-               if (addr->prefix > 96 || addr->valid <= (uint32_t)now)
-                       continue; // Address not suitable
+
+               if (addr->prefix > 96 || addr->valid <= (uint32_t)now) {
+                       char namebuf[INET6_ADDRSTRLEN];
+
+                       inet_ntop(AF_INET6, addr, namebuf, sizeof(namebuf));
+                       syslog(LOG_INFO, "Address %s (prefix %d, valid %u) not suitable as RA prefix on %s",
+                                       namebuf, addr->prefix, addr->valid, iface->ifname);
+                       continue;
+               }
 
                struct nd_opt_prefix_info *p = NULL;
                for (size_t i = 0; i < cnt; ++i) {
@@ -295,11 +309,14 @@ static uint64_t send_router_advert(struct interface *iface, const struct in6_add
                uint32_t this_lifetime = TIME_LEFT(addr->valid, now);
                if (this_lifetime > UINT16_MAX)
                        this_lifetime = UINT16_MAX;
-               if (((addr->addr.s6_addr[0] & 0xfe) != 0xfc || iface->default_router)
+               if ((!IN6_IS_ADDR_ULA(&addr->addr) || iface->default_router)
                                && adv.h.nd_ra_router_lifetime
-                               && ntohs(adv.h.nd_ra_router_lifetime) < this_lifetime)
+                               && ntohs(adv.h.nd_ra_router_lifetime) < this_lifetime) {
                        adv.h.nd_ra_router_lifetime = htons(this_lifetime);
 
+                       syslog(LOG_INFO, "Updating RA router lifetime to %d on %s", this_lifetime, iface->ifname);
+               }
+
                odhcpd_bmemcpy(&p->nd_opt_pi_prefix, &addr->addr,
                                (iface->ra_advrouter) ? 128 : addr->prefix);
                p->nd_opt_pi_type = ND_OPT_PREFIX_INFORMATION;