commit 491abfc62a31c5c0a16e6e7b5c0aadd5f64602fb
Author: Christine Caulfield <ccaulfie@redhat.com>
Date:   Thu Dec 13 09:59:30 2018 +0000

    UDP: Cope with EPERM returned from sendmsg/sendto
    
    IPtables can cause -EPERM to be returned from socket sends, so
    we need to be able to handle it without going into a spin.
    
    SCTP seems to be unaffected.
    
    Signed-off-by: Christine Caulfield <ccaulfie@redhat.com>

diff --git a/libknet/transport_udp.c b/libknet/transport_udp.c
index 25e1ae6..3144502 100644
--- a/libknet/transport_udp.c
+++ b/libknet/transport_udp.c
@@ -401,7 +401,7 @@ int udp_transport_tx_sock_error(knet_handle_t knet_h, int sockfd, int recv_err,
 			read_errs_from_sock(knet_h, sockfd);
 			return 0;
 		}
-		if (recv_errno == EINVAL) {
+		if (recv_errno == EINVAL || recv_errno == EPERM) {
 			return -1;
 		}
 		if ((recv_errno == ENOBUFS) || (recv_errno == EAGAIN)) {