@@ -893,7 +893,12 @@ int print_linkinfo(const struct sockaddr_nl *who,
static int flush_update(void)
{
- if (rtnl_send_check(&rth, filter.flushb, filter.flushp) < 0) {
+ int rc = rtnl_send_check(&rth, filter.flushb, filter.flushp);
+
+ /* if promote_secondaries sysctl setting is off, removing the primary
+ * address makes us try to remove non-existent secondaries. Since we're
+ * flushing, this can be sanely ignored. */
+ if (rc < 0 && errno != EADDRNOTAVAIL) {
perror("Failed to send flush request");
return -1;
}
The core issue here is that with promote_secondaries sysctl setting being turned off, removing the primary address implicitly removes all secondaries as well. Iproute is aware of this and therefore tries to remove all secondary addresses first to circumvent errors due to removing non-existent addresses. But this works only if not too many IP addresses are assigned to an interface, otherwise the RTM_GETADDR response is split up into multiple buffers. In my test-case, flushing more than 42 IPv4 addresses was sufficient to trigger an error: Failed to send flush request: Cannot assign requested address This patch fixes the issue by simply ignoring EADDRNOTAVAIL when flushing. Signed-off-by: Phil Sutter <phil@nwl.cc> --- ip/ipaddress.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)