Work around false-positive DAD-hits

[project/odhcp6c.git] / src / ra.c

diff --git a/src/ra.c b/src/ra.c
index 24c99c5ac16bbad30e4687c57f973c25c8cfc17f..1b2f7294a0b4f27b2905a7613ccd10709a1f81d2 100644 (file)
--- a/src/ra.c
+++ b/src/ra.c
@@ -155,12 +155,16 @@ static bool ra_deduplicate(const struct in6_addr *any, uint8_t length)
 bool ra_rtnl_process(void)
 {
        bool found = false;
+       uint32_t elapsed = odhcp6c_elapsed();
        uint8_t buf[8192];
        while (true) {
                ssize_t len = recv(rtnl_sock, buf, sizeof(buf), MSG_DONTWAIT);
                if (len < 0)
                        break;
 
+               if (elapsed > 10)
+                       continue;
+
                for (struct nlmsghdr *nh = (struct nlmsghdr*)buf; NLMSG_OK(nh, (size_t)len);
                                        nh = NLMSG_NEXT(nh, len)) {
                        struct ifaddrmsg *ifa = NLMSG_DATA(nh);
@@ -197,7 +201,6 @@ bool ra_process(void)
        struct nd_router_advert *adv = (struct nd_router_advert*)buf;
        struct odhcp6c_entry entry = {IN6ADDR_ANY_INIT, 0, 0, IN6ADDR_ANY_INIT, 0, 0};
        const struct in6_addr any = IN6ADDR_ANY_INIT;
-       odhcp6c_expire();
 
        while (true) {
                struct sockaddr_in6 from;
@@ -214,7 +217,10 @@ bool ra_process(void)
                        rs_attempt = 0;
                }
 
-               found = true;
+               if (!found) {
+                       odhcp6c_expire();
+                       found = true;
+               }
                uint32_t router_valid = ntohs(adv->nd_ra_router_lifetime);
 
                // Parse default route
@@ -308,6 +314,8 @@ bool ra_process(void)
                                entry[i].valid = router_valid;
        }
 
-       odhcp6c_expire();
+       if (found)
+               odhcp6c_expire();
+
        return found;
 }