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/*
* 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;
}
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