kernel-netlink: Fallback to UDP if detecting socket protocol fails

getsockopt(SO_PROTOCOL) is not supported before 2.6.32. Default to UDP if
either the SO_PROTOCOL define is missing or the syscall fails.

diff --git a/src/libhydra/plugins/kernel_netlink/kernel_netlink_ipsec.c b/src/libhydra/plugins/kernel_netlink/kernel_netlink_ipsec.c
index f0ada41d586b25447c70d1ad31c458b7b13f06c6..0f88b649edc249533284be0fa8a462910e7b767d 100644 (file)
--- a/src/libhydra/plugins/kernel_netlink/kernel_netlink_ipsec.c
+++ b/src/libhydra/plugins/kernel_netlink/kernel_netlink_ipsec.c
@@ -2720,10 +2720,12 @@ static bool add_port_bypass(private_kernel_netlink_ipsec_t *this,
        {
                return FALSE;
        }
+#ifdef SO_PROTOCOL /* since 2.6.32 */
        len = sizeof(bypass.proto);
        if (getsockopt(fd, SOL_SOCKET, SO_PROTOCOL, &bypass.proto, &len) != 0)
-       {
-               return FALSE;
+#endif
+       {       /* assume UDP if SO_PROTOCOL not supported */
+               bypass.proto = IPPROTO_UDP;
        }
        switch (family)
        {