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-rw-r--r--lib/ngtcp2_pv.c172
1 files changed, 172 insertions, 0 deletions
diff --git a/lib/ngtcp2_pv.c b/lib/ngtcp2_pv.c
new file mode 100644
index 0000000..314e005
--- /dev/null
+++ b/lib/ngtcp2_pv.c
@@ -0,0 +1,172 @@
+/*
+ * ngtcp2
+ *
+ * Copyright (c) 2019 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_pv.h"
+
+#include <string.h>
+#include <assert.h>
+
+#include "ngtcp2_mem.h"
+#include "ngtcp2_log.h"
+#include "ngtcp2_macro.h"
+#include "ngtcp2_addr.h"
+
+void ngtcp2_pv_entry_init(ngtcp2_pv_entry *pvent, const uint8_t *data,
+ ngtcp2_tstamp expiry, uint8_t flags) {
+ memcpy(pvent->data, data, sizeof(pvent->data));
+ pvent->expiry = expiry;
+ pvent->flags = flags;
+}
+
+int ngtcp2_pv_new(ngtcp2_pv **ppv, const ngtcp2_dcid *dcid,
+ ngtcp2_duration timeout, uint8_t flags, ngtcp2_log *log,
+ const ngtcp2_mem *mem) {
+ (*ppv) = ngtcp2_mem_malloc(mem, sizeof(ngtcp2_pv));
+ if (*ppv == NULL) {
+ return NGTCP2_ERR_NOMEM;
+ }
+
+ ngtcp2_static_ringbuf_pv_ents_init(&(*ppv)->ents);
+
+ ngtcp2_dcid_copy(&(*ppv)->dcid, dcid);
+
+ (*ppv)->mem = mem;
+ (*ppv)->log = log;
+ (*ppv)->timeout = timeout;
+ (*ppv)->fallback_pto = 0;
+ (*ppv)->started_ts = UINT64_MAX;
+ (*ppv)->probe_pkt_left = NGTCP2_PV_NUM_PROBE_PKT;
+ (*ppv)->round = 0;
+ (*ppv)->flags = flags;
+
+ return 0;
+}
+
+void ngtcp2_pv_del(ngtcp2_pv *pv) {
+ if (pv == NULL) {
+ return;
+ }
+ ngtcp2_mem_free(pv->mem, pv);
+}
+
+void ngtcp2_pv_add_entry(ngtcp2_pv *pv, const uint8_t *data,
+ ngtcp2_tstamp expiry, uint8_t flags,
+ ngtcp2_tstamp ts) {
+ ngtcp2_pv_entry *ent;
+
+ assert(pv->probe_pkt_left);
+
+ if (ngtcp2_ringbuf_len(&pv->ents.rb) == 0) {
+ pv->started_ts = ts;
+ }
+
+ ent = ngtcp2_ringbuf_push_back(&pv->ents.rb);
+ ngtcp2_pv_entry_init(ent, data, expiry, flags);
+
+ pv->flags &= (uint8_t)~NGTCP2_PV_FLAG_CANCEL_TIMER;
+ --pv->probe_pkt_left;
+}
+
+int ngtcp2_pv_validate(ngtcp2_pv *pv, uint8_t *pflags, const uint8_t *data) {
+ size_t len = ngtcp2_ringbuf_len(&pv->ents.rb);
+ size_t i;
+ ngtcp2_pv_entry *ent;
+
+ if (len == 0) {
+ return NGTCP2_ERR_INVALID_STATE;
+ }
+
+ for (i = 0; i < len; ++i) {
+ ent = ngtcp2_ringbuf_get(&pv->ents.rb, i);
+ if (memcmp(ent->data, data, sizeof(ent->data)) == 0) {
+ *pflags = ent->flags;
+ ngtcp2_log_info(pv->log, NGTCP2_LOG_EVENT_PTV, "path has been validated");
+ return 0;
+ }
+ }
+
+ return NGTCP2_ERR_INVALID_ARGUMENT;
+}
+
+void ngtcp2_pv_handle_entry_expiry(ngtcp2_pv *pv, ngtcp2_tstamp ts) {
+ ngtcp2_pv_entry *ent;
+
+ if (ngtcp2_ringbuf_len(&pv->ents.rb) == 0) {
+ return;
+ }
+
+ ent = ngtcp2_ringbuf_get(&pv->ents.rb, ngtcp2_ringbuf_len(&pv->ents.rb) - 1);
+
+ if (ent->expiry > ts) {
+ return;
+ }
+
+ ++pv->round;
+ pv->probe_pkt_left = NGTCP2_PV_NUM_PROBE_PKT;
+}
+
+int ngtcp2_pv_should_send_probe(ngtcp2_pv *pv) {
+ return pv->probe_pkt_left > 0;
+}
+
+int ngtcp2_pv_validation_timed_out(ngtcp2_pv *pv, ngtcp2_tstamp ts) {
+ ngtcp2_tstamp t;
+ ngtcp2_pv_entry *ent;
+
+ if (pv->started_ts == UINT64_MAX) {
+ return 0;
+ }
+
+ assert(ngtcp2_ringbuf_len(&pv->ents.rb));
+
+ ent = ngtcp2_ringbuf_get(&pv->ents.rb, ngtcp2_ringbuf_len(&pv->ents.rb) - 1);
+
+ t = pv->started_ts + pv->timeout;
+ t = ngtcp2_max(t, ent->expiry);
+
+ return t <= ts;
+}
+
+ngtcp2_tstamp ngtcp2_pv_next_expiry(ngtcp2_pv *pv) {
+ ngtcp2_pv_entry *ent;
+
+ if ((pv->flags & NGTCP2_PV_FLAG_CANCEL_TIMER) ||
+ ngtcp2_ringbuf_len(&pv->ents.rb) == 0) {
+ return UINT64_MAX;
+ }
+
+ ent = ngtcp2_ringbuf_get(&pv->ents.rb, ngtcp2_ringbuf_len(&pv->ents.rb) - 1);
+
+ return ent->expiry;
+}
+
+void ngtcp2_pv_cancel_expired_timer(ngtcp2_pv *pv, ngtcp2_tstamp ts) {
+ ngtcp2_tstamp expiry = ngtcp2_pv_next_expiry(pv);
+
+ if (expiry > ts) {
+ return;
+ }
+
+ pv->flags |= NGTCP2_PV_FLAG_CANCEL_TIMER;
+}