selftests: net: ip_defrag: ignore EPERM

When running with conntrack rules, the dropped overlap fragments may cause
EPERM to be returned to sendto. Instead of completely failing, just ignore
those errors and continue. If this causes packets with overlap fragments to
be dropped as expected, that is okay. And if it causes packets that are
expected to be received to be dropped, which should not happen, it will be
detected as failure.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/tools/testing/selftests/net/ip_defrag.c b/tools/testing/selftests/net/ip_defrag.c
index c0c9ecb891e1d78585e0db95fd8783be31bc563a..f9ed749fd8c7df61dabc2d622d7d32b527534f0c 100644 (file)
--- a/tools/testing/selftests/net/ip_defrag.c
+++ b/tools/testing/selftests/net/ip_defrag.c
@@ -192,9 +192,9 @@ static void send_fragment(int fd_raw, struct sockaddr *addr, socklen_t alen,
        }
 
        res = sendto(fd_raw, ip_frame, frag_len, 0, addr, alen);
-       if (res < 0)
+       if (res < 0 && errno != EPERM)
                error(1, errno, "send_fragment");
-       if (res != frag_len)
+       if (res >= 0 && res != frag_len)
                error(1, 0, "send_fragment: %d vs %d", res, frag_len);
 
        frag_counter++;
@@ -313,9 +313,9 @@ static void send_udp_frags(int fd_raw, struct sockaddr *addr,
                        iphdr->ip_len = htons(frag_len);
                }
                res = sendto(fd_raw, ip_frame, frag_len, 0, addr, alen);
-               if (res < 0)
+               if (res < 0 && errno != EPERM)
                        error(1, errno, "sendto overlap: %d", frag_len);
-               if (res != frag_len)
+               if (res >= 0 && res != frag_len)
                        error(1, 0, "sendto overlap: %d vs %d", (int)res, frag_len);
                frag_counter++;
        }