1 files changed, 153 insertions, 0 deletions
diff --git a/tests/ngtcp2_pmtud_test.c b/tests/ngtcp2_pmtud_test.c
new file mode 100644
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--- /dev/null
+++ b/tests/ngtcp2_pmtud_test.c
@@ -0,0 +1,153 @@
+/*
+ * ngtcp2
+ *
+ * Copyright (c) 2022 ngtcp2 contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#include "ngtcp2_pmtud_test.h"
+
+#include <CUnit/CUnit.h>
+
+#include "ngtcp2_pmtud.h"
+#include "ngtcp2_test_helper.h"
+
+void test_ngtcp2_pmtud_probe(void) {
+  const ngtcp2_mem *mem = ngtcp2_mem_default();
+  ngtcp2_pmtud *pmtud;
+  int rv;
+
+  /* Send probe and get success */
+  rv = ngtcp2_pmtud_new(&pmtud, NGTCP2_MAX_UDP_PAYLOAD_SIZE, 1452, 0, mem);
+
+  CU_ASSERT(0 == rv);
+  CU_ASSERT(0 == pmtud->mtu_idx);
+  CU_ASSERT(!ngtcp2_pmtud_finished(pmtud));
+  CU_ASSERT(ngtcp2_pmtud_require_probe(pmtud));
+  CU_ASSERT(1454 - 48 == ngtcp2_pmtud_probelen(pmtud));
+
+  ngtcp2_pmtud_probe_sent(pmtud, 2, 0);
+
+  CU_ASSERT(1 == pmtud->num_pkts_sent);
+  CU_ASSERT(2 == pmtud->expiry);
+  CU_ASSERT(!ngtcp2_pmtud_require_probe(pmtud));
+
+  ngtcp2_pmtud_handle_expiry(pmtud, 1);
+
+  CU_ASSERT(!ngtcp2_pmtud_require_probe(pmtud));
+
+  ngtcp2_pmtud_handle_expiry(pmtud, 2);
+
+  CU_ASSERT(ngtcp2_pmtud_require_probe(pmtud));
+
+  ngtcp2_pmtud_probe_sent(pmtud, 2, 2);
+
+  CU_ASSERT(2 == pmtud->num_pkts_sent);
+  CU_ASSERT(4 == pmtud->expiry);
+  CU_ASSERT(!ngtcp2_pmtud_require_probe(pmtud));
+
+  ngtcp2_pmtud_handle_expiry(pmtud, 4);
+
+  CU_ASSERT(ngtcp2_pmtud_require_probe(pmtud));
+
+  ngtcp2_pmtud_probe_sent(pmtud, 2, 4);
+
+  CU_ASSERT(3 == pmtud->num_pkts_sent);
+  CU_ASSERT(10 == pmtud->expiry);
+  CU_ASSERT(!ngtcp2_pmtud_require_probe(pmtud));
+
+  ngtcp2_pmtud_probe_success(pmtud, ngtcp2_pmtud_probelen(pmtud));
+
+  CU_ASSERT(3 == pmtud->mtu_idx);
+  CU_ASSERT(UINT64_MAX == pmtud->expiry);
+  CU_ASSERT(0 == pmtud->num_pkts_sent);
+  CU_ASSERT(ngtcp2_pmtud_require_probe(pmtud));
+  CU_ASSERT(1492 - 48 == ngtcp2_pmtud_probelen(pmtud));
+
+  ngtcp2_pmtud_probe_sent(pmtud, 2, 10);
+  ngtcp2_pmtud_handle_expiry(pmtud, 12);
+  ngtcp2_pmtud_probe_sent(pmtud, 2, 12);
+  ngtcp2_pmtud_handle_expiry(pmtud, 14);
+  ngtcp2_pmtud_probe_sent(pmtud, 2, 14);
+  ngtcp2_pmtud_handle_expiry(pmtud, 20);
+
+  CU_ASSERT(1492 - 48 == pmtud->min_fail_udp_payload_size);
+  CU_ASSERT(ngtcp2_pmtud_finished(pmtud));
+
+  ngtcp2_pmtud_del(pmtud);
+
+  /* Failing 2nd probe should skip the third probe */
+  rv = ngtcp2_pmtud_new(&pmtud, NGTCP2_MAX_UDP_PAYLOAD_SIZE, 1452, 0, mem);
+
+  ngtcp2_pmtud_probe_sent(pmtud, 2, 0);
+  ngtcp2_pmtud_handle_expiry(pmtud, 2);
+  ngtcp2_pmtud_probe_sent(pmtud, 2, 2);
+  ngtcp2_pmtud_handle_expiry(pmtud, 4);
+  ngtcp2_pmtud_probe_sent(pmtud, 2, 4);
+  ngtcp2_pmtud_handle_expiry(pmtud, 10);
+
+  CU_ASSERT(1454 - 48 == pmtud->min_fail_udp_payload_size);
+  CU_ASSERT(1 == pmtud->mtu_idx);
+
+  ngtcp2_pmtud_probe_sent(pmtud, 2, 10);
+  ngtcp2_pmtud_handle_expiry(pmtud, 12);
+  ngtcp2_pmtud_probe_sent(pmtud, 2, 12);
+  ngtcp2_pmtud_handle_expiry(pmtud, 14);
+  ngtcp2_pmtud_probe_sent(pmtud, 2, 14);
+  ngtcp2_pmtud_handle_expiry(pmtud, 20);
+
+  CU_ASSERT(1390 - 48 == pmtud->min_fail_udp_payload_size);
+  CU_ASSERT(2 == pmtud->mtu_idx);
+
+  ngtcp2_pmtud_probe_sent(pmtud, 2, 10);
+  ngtcp2_pmtud_probe_success(pmtud, 1280 - 48);
+
+  CU_ASSERT(ngtcp2_pmtud_finished(pmtud));
+
+  ngtcp2_pmtud_del(pmtud);
+
+  /* Skip 1st probe because it is larger than hard max. */
+  rv = ngtcp2_pmtud_new(&pmtud, NGTCP2_MAX_UDP_PAYLOAD_SIZE, 1454 - 48 - 1, 0,
+                        mem);
+
+  CU_ASSERT(0 == rv);
+  CU_ASSERT(1 == pmtud->mtu_idx);
+
+  ngtcp2_pmtud_del(pmtud);
+
+  /* PMTUD finishes immediately because we know that all candidates
+     are lower than the current maximum. */
+  rv = ngtcp2_pmtud_new(&pmtud, 1492 - 48, 1452, 0, mem);
+
+  CU_ASSERT(0 == rv);
+  CU_ASSERT(ngtcp2_pmtud_finished(pmtud));
+
+  ngtcp2_pmtud_del(pmtud);
+
+  /* PMTUD finishes immediately because the hard maximum size is lower
+     than the candidates. */
+  rv = ngtcp2_pmtud_new(&pmtud, NGTCP2_MAX_UDP_PAYLOAD_SIZE,
+                        NGTCP2_MAX_UDP_PAYLOAD_SIZE, 0, mem);
+
+  CU_ASSERT(0 == rv);
+  CU_ASSERT(ngtcp2_pmtud_finished(pmtud));
+
+  ngtcp2_pmtud_del(pmtud);
+}