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/*
* ngtcp2
*
* Copyright (c) 2017 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_pkt.h"
#include <assert.h>
#include <string.h>
#include "ngtcp2_conv.h"
#include "ngtcp2_str.h"
#include "ngtcp2_macro.h"
#include "ngtcp2_cid.h"
#include "ngtcp2_mem.h"
#include "ngtcp2_vec.h"
#include "ngtcp2_unreachable.h"
int ngtcp2_pkt_chain_new(ngtcp2_pkt_chain **ppc, const ngtcp2_path *path,
const ngtcp2_pkt_info *pi, const uint8_t *pkt,
size_t pktlen, size_t dgramlen, ngtcp2_tstamp ts,
const ngtcp2_mem *mem) {
*ppc = ngtcp2_mem_malloc(mem, sizeof(ngtcp2_pkt_chain) + pktlen);
if (*ppc == NULL) {
return NGTCP2_ERR_NOMEM;
}
ngtcp2_path_storage_init2(&(*ppc)->path, path);
(*ppc)->pi = *pi;
(*ppc)->next = NULL;
(*ppc)->pkt = (uint8_t *)(*ppc) + sizeof(ngtcp2_pkt_chain);
(*ppc)->pktlen = pktlen;
(*ppc)->dgramlen = dgramlen;
(*ppc)->ts = ts;
memcpy((*ppc)->pkt, pkt, pktlen);
return 0;
}
void ngtcp2_pkt_chain_del(ngtcp2_pkt_chain *pc, const ngtcp2_mem *mem) {
ngtcp2_mem_free(mem, pc);
}
int ngtcp2_pkt_decode_version_cid(ngtcp2_version_cid *dest, const uint8_t *data,
size_t datalen, size_t short_dcidlen) {
size_t len;
uint32_t version;
size_t dcidlen, scidlen;
int supported_version;
assert(datalen);
if (data[0] & NGTCP2_HEADER_FORM_BIT) {
/* 1 byte (Header Form, Fixed Bit, Long Packet Type, Type-Specific bits)
* 4 bytes Version
* 1 byte DCID Length
* 1 byte SCID Length
*/
len = 1 + 4 + 1 + 1;
if (datalen < len) {
return NGTCP2_ERR_INVALID_ARGUMENT;
}
dcidlen = data[5];
len += dcidlen;
if (datalen < len) {
return NGTCP2_ERR_INVALID_ARGUMENT;
}
scidlen = data[5 + 1 + dcidlen];
len += scidlen;
if (datalen < len) {
return NGTCP2_ERR_INVALID_ARGUMENT;
}
ngtcp2_get_uint32(&version, &data[1]);
supported_version = ngtcp2_is_supported_version(version);
if (supported_version &&
(dcidlen > NGTCP2_MAX_CIDLEN || scidlen > NGTCP2_MAX_CIDLEN)) {
return NGTCP2_ERR_INVALID_ARGUMENT;
}
if (version && !supported_version &&
datalen < NGTCP2_MAX_UDP_PAYLOAD_SIZE) {
return NGTCP2_ERR_INVALID_ARGUMENT;
}
dest->version = version;
dest->dcid = &data[6];
dest->dcidlen = dcidlen;
dest->scid = &data[6 + dcidlen + 1];
dest->scidlen = scidlen;
if (!version) {
/* VN */
return 0;
}
if (!supported_version) {
return NGTCP2_ERR_VERSION_NEGOTIATION;
}
return 0;
}
assert(short_dcidlen <= NGTCP2_MAX_CIDLEN);
len = 1 + short_dcidlen;
if (datalen < len) {
return NGTCP2_ERR_INVALID_ARGUMENT;
}
dest->version = 0;
dest->dcid = &data[1];
dest->dcidlen = short_dcidlen;
dest->scid = NULL;
dest->scidlen = 0;
return 0;
}
void ngtcp2_pkt_hd_init(ngtcp2_pkt_hd *hd, uint8_t flags, uint8_t type,
const ngtcp2_cid *dcid, const ngtcp2_cid *scid,
int64_t pkt_num, size_t pkt_numlen, uint32_t version,
size_t len) {
hd->flags = flags;
hd->type = type;
if (dcid) {
hd->dcid = *dcid;
} else {
ngtcp2_cid_zero(&hd->dcid);
}
if (scid) {
hd->scid = *scid;
} else {
ngtcp2_cid_zero(&hd->scid);
}
hd->pkt_num = pkt_num;
hd->token = NULL;
hd->tokenlen = 0;
hd->pkt_numlen = pkt_numlen;
hd->version = version;
hd->len = len;
}
ngtcp2_ssize ngtcp2_pkt_decode_hd_long(ngtcp2_pkt_hd *dest, const uint8_t *pkt,
size_t pktlen) {
uint8_t type;
uint32_t version;
size_t dcil, scil;
const uint8_t *p;
size_t len = 0;
size_t n;
size_t ntokenlen = 0;
const uint8_t *token = NULL;
size_t tokenlen = 0;
uint64_t vi;
uint8_t flags = NGTCP2_PKT_FLAG_LONG_FORM;
if (pktlen < 5) {
return NGTCP2_ERR_INVALID_ARGUMENT;
}
if (!(pkt[0] & NGTCP2_HEADER_FORM_BIT)) {
return NGTCP2_ERR_INVALID_ARGUMENT;
}
ngtcp2_get_uint32(&version, &pkt[1]);
if (version == 0) {
type = NGTCP2_PKT_VERSION_NEGOTIATION;
/* Version Negotiation is not a long header packet. */
flags = NGTCP2_PKT_FLAG_NONE;
/* This must be Version Negotiation packet which lacks packet
number and payload length fields. */
len = 5 + 2;
} else {
if (!(pkt[0] & NGTCP2_FIXED_BIT_MASK)) {
flags |= NGTCP2_PKT_FLAG_FIXED_BIT_CLEAR;
}
type = ngtcp2_pkt_get_type_long(version, pkt[0]);
switch (type) {
case 0:
return NGTCP2_ERR_INVALID_ARGUMENT;
case NGTCP2_PKT_INITIAL:
len = 1 /* Token Length */ + NGTCP2_MIN_LONG_HEADERLEN -
1; /* Cut packet number field */
break;
case NGTCP2_PKT_RETRY:
/* Retry packet does not have packet number and length fields */
len = 5 + 2;
break;
case NGTCP2_PKT_HANDSHAKE:
case NGTCP2_PKT_0RTT:
len = NGTCP2_MIN_LONG_HEADERLEN - 1; /* Cut packet number field */
break;
default:
/* Unreachable */
ngtcp2_unreachable();
}
}
if (pktlen < len) {
return NGTCP2_ERR_INVALID_ARGUMENT;
}
p = &pkt[5];
dcil = *p;
if (dcil > NGTCP2_MAX_CIDLEN) {
/* QUIC v1 implementation never expect to receive CID length more
than NGTCP2_MAX_CIDLEN. */
return NGTCP2_ERR_INVALID_ARGUMENT;
}
len += dcil;
if (pktlen < len) {
return NGTCP2_ERR_INVALID_ARGUMENT;
}
p += 1 + dcil;
scil = *p;
if (scil > NGTCP2_MAX_CIDLEN) {
return NGTCP2_ERR_INVALID_ARGUMENT;
}
len += scil;
if (pktlen < len) {
return NGTCP2_ERR_INVALID_ARGUMENT;
}
p += 1 + scil;
if (type == NGTCP2_PKT_INITIAL) {
/* Token Length */
ntokenlen = ngtcp2_get_uvarintlen(p);
len += ntokenlen - 1;
if (pktlen < len) {
return NGTCP2_ERR_INVALID_ARGUMENT;
}
p = ngtcp2_get_uvarint(&vi, p);
if (pktlen - len < vi) {
return NGTCP2_ERR_INVALID_ARGUMENT;
}
tokenlen = (size_t)vi;
len += tokenlen;
if (tokenlen) {
token = p;
}
p += tokenlen;
}
switch (type) {
case NGTCP2_PKT_RETRY:
break;
default:
if (!(flags & NGTCP2_PKT_FLAG_LONG_FORM)) {
assert(type == NGTCP2_PKT_VERSION_NEGOTIATION);
/* Version Negotiation is not a long header packet. */
break;
}
/* Length */
n = ngtcp2_get_uvarintlen(p);
len += n - 1;
if (pktlen < len) {
return NGTCP2_ERR_INVALID_ARGUMENT;
}
}
dest->flags = flags;
dest->type = type;
dest->version = version;
dest->pkt_num = 0;
dest->pkt_numlen = 0;
p = &pkt[6];
ngtcp2_cid_init(&dest->dcid, p, dcil);
p += dcil + 1;
ngtcp2_cid_init(&dest->scid, p, scil);
p += scil;
dest->token = token;
dest->tokenlen = tokenlen;
p += ntokenlen + tokenlen;
switch (type) {
case NGTCP2_PKT_RETRY:
dest->len = 0;
break;
default:
if (!(flags & NGTCP2_PKT_FLAG_LONG_FORM)) {
assert(type == NGTCP2_PKT_VERSION_NEGOTIATION);
/* Version Negotiation is not a long header packet. */
dest->len = 0;
break;
}
p = ngtcp2_get_uvarint(&vi, p);
if (vi > SIZE_MAX) {
return NGTCP2_ERR_INVALID_ARGUMENT;
}
dest->len = (size_t)vi;
}
assert((size_t)(p - pkt) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_decode_hd_short(ngtcp2_pkt_hd *dest, const uint8_t *pkt,
size_t pktlen, size_t dcidlen) {
size_t len = 1 + dcidlen;
const uint8_t *p = pkt;
uint8_t flags = NGTCP2_PKT_FLAG_NONE;
assert(dcidlen <= NGTCP2_MAX_CIDLEN);
if (pktlen < len) {
return NGTCP2_ERR_INVALID_ARGUMENT;
}
if (pkt[0] & NGTCP2_HEADER_FORM_BIT) {
return NGTCP2_ERR_INVALID_ARGUMENT;
}
if (!(pkt[0] & NGTCP2_FIXED_BIT_MASK)) {
flags |= NGTCP2_PKT_FLAG_FIXED_BIT_CLEAR;
}
p = &pkt[1];
dest->type = NGTCP2_PKT_1RTT;
ngtcp2_cid_init(&dest->dcid, p, dcidlen);
p += dcidlen;
/* Set 0 to SCID so that we don't accidentally reference it and gets
garbage. */
ngtcp2_cid_zero(&dest->scid);
dest->flags = flags;
dest->version = 0;
dest->len = 0;
dest->pkt_num = 0;
dest->pkt_numlen = 0;
dest->token = NULL;
dest->tokenlen = 0;
assert((size_t)(p - pkt) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_encode_hd_long(uint8_t *out, size_t outlen,
const ngtcp2_pkt_hd *hd) {
uint8_t *p;
size_t len = NGTCP2_MIN_LONG_HEADERLEN + hd->dcid.datalen + hd->scid.datalen -
2; /* NGTCP2_MIN_LONG_HEADERLEN includes 1 byte for
len and 1 byte for packet number. */
if (hd->type != NGTCP2_PKT_RETRY) {
len += NGTCP2_PKT_LENGTHLEN /* Length */ + hd->pkt_numlen;
}
if (hd->type == NGTCP2_PKT_INITIAL) {
len += ngtcp2_put_uvarintlen(hd->tokenlen) + hd->tokenlen;
}
if (outlen < len) {
return NGTCP2_ERR_NOBUF;
}
p = out;
*p = (uint8_t)(NGTCP2_HEADER_FORM_BIT |
(ngtcp2_pkt_versioned_type(hd->version, hd->type) << 4) |
(uint8_t)(hd->pkt_numlen - 1));
if (!(hd->flags & NGTCP2_PKT_FLAG_FIXED_BIT_CLEAR)) {
*p |= NGTCP2_FIXED_BIT_MASK;
}
++p;
p = ngtcp2_put_uint32be(p, hd->version);
*p++ = (uint8_t)hd->dcid.datalen;
if (hd->dcid.datalen) {
p = ngtcp2_cpymem(p, hd->dcid.data, hd->dcid.datalen);
}
*p++ = (uint8_t)hd->scid.datalen;
if (hd->scid.datalen) {
p = ngtcp2_cpymem(p, hd->scid.data, hd->scid.datalen);
}
if (hd->type == NGTCP2_PKT_INITIAL) {
p = ngtcp2_put_uvarint(p, hd->tokenlen);
if (hd->tokenlen) {
p = ngtcp2_cpymem(p, hd->token, hd->tokenlen);
}
}
if (hd->type != NGTCP2_PKT_RETRY) {
p = ngtcp2_put_uvarint30(p, (uint32_t)hd->len);
p = ngtcp2_put_pkt_num(p, hd->pkt_num, hd->pkt_numlen);
}
assert((size_t)(p - out) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_encode_hd_short(uint8_t *out, size_t outlen,
const ngtcp2_pkt_hd *hd) {
uint8_t *p;
size_t len = 1 + hd->dcid.datalen + hd->pkt_numlen;
if (outlen < len) {
return NGTCP2_ERR_NOBUF;
}
p = out;
*p = (uint8_t)(hd->pkt_numlen - 1);
if (!(hd->flags & NGTCP2_PKT_FLAG_FIXED_BIT_CLEAR)) {
*p |= NGTCP2_FIXED_BIT_MASK;
}
if (hd->flags & NGTCP2_PKT_FLAG_KEY_PHASE) {
*p |= NGTCP2_SHORT_KEY_PHASE_BIT;
}
++p;
if (hd->dcid.datalen) {
p = ngtcp2_cpymem(p, hd->dcid.data, hd->dcid.datalen);
}
p = ngtcp2_put_pkt_num(p, hd->pkt_num, hd->pkt_numlen);
assert((size_t)(p - out) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_decode_frame(ngtcp2_frame *dest, const uint8_t *payload,
size_t payloadlen) {
uint8_t type;
if (payloadlen == 0) {
return NGTCP2_ERR_FRAME_ENCODING;
}
type = payload[0];
switch (type) {
case NGTCP2_FRAME_PADDING:
return ngtcp2_pkt_decode_padding_frame(&dest->padding, payload, payloadlen);
case NGTCP2_FRAME_RESET_STREAM:
return ngtcp2_pkt_decode_reset_stream_frame(&dest->reset_stream, payload,
payloadlen);
case NGTCP2_FRAME_CONNECTION_CLOSE:
case NGTCP2_FRAME_CONNECTION_CLOSE_APP:
return ngtcp2_pkt_decode_connection_close_frame(&dest->connection_close,
payload, payloadlen);
case NGTCP2_FRAME_MAX_DATA:
return ngtcp2_pkt_decode_max_data_frame(&dest->max_data, payload,
payloadlen);
case NGTCP2_FRAME_MAX_STREAM_DATA:
return ngtcp2_pkt_decode_max_stream_data_frame(&dest->max_stream_data,
payload, payloadlen);
case NGTCP2_FRAME_MAX_STREAMS_BIDI:
case NGTCP2_FRAME_MAX_STREAMS_UNI:
return ngtcp2_pkt_decode_max_streams_frame(&dest->max_streams, payload,
payloadlen);
case NGTCP2_FRAME_PING:
return ngtcp2_pkt_decode_ping_frame(&dest->ping, payload, payloadlen);
case NGTCP2_FRAME_DATA_BLOCKED:
return ngtcp2_pkt_decode_data_blocked_frame(&dest->data_blocked, payload,
payloadlen);
case NGTCP2_FRAME_STREAM_DATA_BLOCKED:
return ngtcp2_pkt_decode_stream_data_blocked_frame(
&dest->stream_data_blocked, payload, payloadlen);
case NGTCP2_FRAME_STREAMS_BLOCKED_BIDI:
case NGTCP2_FRAME_STREAMS_BLOCKED_UNI:
return ngtcp2_pkt_decode_streams_blocked_frame(&dest->streams_blocked,
payload, payloadlen);
case NGTCP2_FRAME_NEW_CONNECTION_ID:
return ngtcp2_pkt_decode_new_connection_id_frame(&dest->new_connection_id,
payload, payloadlen);
case NGTCP2_FRAME_STOP_SENDING:
return ngtcp2_pkt_decode_stop_sending_frame(&dest->stop_sending, payload,
payloadlen);
case NGTCP2_FRAME_ACK:
case NGTCP2_FRAME_ACK_ECN:
return ngtcp2_pkt_decode_ack_frame(&dest->ack, payload, payloadlen);
case NGTCP2_FRAME_PATH_CHALLENGE:
return ngtcp2_pkt_decode_path_challenge_frame(&dest->path_challenge,
payload, payloadlen);
case NGTCP2_FRAME_PATH_RESPONSE:
return ngtcp2_pkt_decode_path_response_frame(&dest->path_response, payload,
payloadlen);
case NGTCP2_FRAME_CRYPTO:
return ngtcp2_pkt_decode_crypto_frame(&dest->stream, payload, payloadlen);
case NGTCP2_FRAME_NEW_TOKEN:
return ngtcp2_pkt_decode_new_token_frame(&dest->new_token, payload,
payloadlen);
case NGTCP2_FRAME_RETIRE_CONNECTION_ID:
return ngtcp2_pkt_decode_retire_connection_id_frame(
&dest->retire_connection_id, payload, payloadlen);
case NGTCP2_FRAME_HANDSHAKE_DONE:
return ngtcp2_pkt_decode_handshake_done_frame(&dest->handshake_done,
payload, payloadlen);
case NGTCP2_FRAME_DATAGRAM:
case NGTCP2_FRAME_DATAGRAM_LEN:
return ngtcp2_pkt_decode_datagram_frame(&dest->datagram, payload,
payloadlen);
default:
if ((type & ~(NGTCP2_FRAME_STREAM - 1)) == NGTCP2_FRAME_STREAM) {
return ngtcp2_pkt_decode_stream_frame(&dest->stream, payload, payloadlen);
}
/* For frame types > 0xff, use ngtcp2_get_uvarintlen and
ngtcp2_get_uvarint to get a frame type, and then switch over
it. Verify that payloadlen >= ngtcp2_get_uvarintlen(payload)
before calling ngtcp2_get_uvarint(payload). */
return NGTCP2_ERR_FRAME_ENCODING;
}
}
ngtcp2_ssize ngtcp2_pkt_decode_stream_frame(ngtcp2_stream *dest,
const uint8_t *payload,
size_t payloadlen) {
uint8_t type;
size_t len = 1 + 1;
const uint8_t *p;
size_t datalen = 0;
size_t ndatalen = 0;
size_t n;
uint64_t vi;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
type = payload[0];
p = payload + 1;
n = ngtcp2_get_uvarintlen(p);
len += n - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p += n;
if (type & NGTCP2_STREAM_OFF_BIT) {
++len;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
n = ngtcp2_get_uvarintlen(p);
len += n - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p += n;
}
if (type & NGTCP2_STREAM_LEN_BIT) {
++len;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
ndatalen = ngtcp2_get_uvarintlen(p);
len += ndatalen - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
/* p = */ ngtcp2_get_uvarint(&vi, p);
if (payloadlen - len < vi) {
return NGTCP2_ERR_FRAME_ENCODING;
}
datalen = (size_t)vi;
len += datalen;
} else {
len = payloadlen;
}
p = payload + 1;
dest->type = NGTCP2_FRAME_STREAM;
dest->flags = (uint8_t)(type & ~NGTCP2_FRAME_STREAM);
dest->fin = (type & NGTCP2_STREAM_FIN_BIT) != 0;
p = ngtcp2_get_varint(&dest->stream_id, p);
if (type & NGTCP2_STREAM_OFF_BIT) {
p = ngtcp2_get_uvarint(&dest->offset, p);
} else {
dest->offset = 0;
}
if (type & NGTCP2_STREAM_LEN_BIT) {
p += ndatalen;
} else {
datalen = payloadlen - (size_t)(p - payload);
}
if (datalen) {
dest->data[0].len = datalen;
dest->data[0].base = (uint8_t *)p;
dest->datacnt = 1;
p += datalen;
} else {
dest->datacnt = 0;
}
assert((size_t)(p - payload) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_decode_ack_frame(ngtcp2_ack *dest,
const uint8_t *payload,
size_t payloadlen) {
size_t rangecnt, max_rangecnt;
size_t nrangecnt;
size_t len = 1 + 1 + 1 + 1 + 1;
const uint8_t *p;
size_t i, j;
ngtcp2_ack_range *range;
size_t n;
uint8_t type;
uint64_t vi;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
type = payload[0];
p = payload + 1;
/* Largest Acknowledged */
n = ngtcp2_get_uvarintlen(p);
len += n - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p += n;
/* ACK Delay */
n = ngtcp2_get_uvarintlen(p);
len += n - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p += n;
/* ACK Range Count */
nrangecnt = ngtcp2_get_uvarintlen(p);
len += nrangecnt - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p = ngtcp2_get_uvarint(&vi, p);
if (vi > SIZE_MAX / (1 + 1) || payloadlen - len < vi * (1 + 1)) {
return NGTCP2_ERR_FRAME_ENCODING;
}
rangecnt = (size_t)vi;
len += rangecnt * (1 + 1);
/* First ACK Range */
n = ngtcp2_get_uvarintlen(p);
len += n - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p += n;
for (i = 0; i < rangecnt; ++i) {
/* Gap, and Additional ACK Range */
for (j = 0; j < 2; ++j) {
n = ngtcp2_get_uvarintlen(p);
len += n - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p += n;
}
}
if (type == NGTCP2_FRAME_ACK_ECN) {
len += 3;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
for (i = 0; i < 3; ++i) {
n = ngtcp2_get_uvarintlen(p);
len += n - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p += n;
}
}
/* TODO We might not decode all ranges. It could be very large. */
max_rangecnt = ngtcp2_min(NGTCP2_MAX_ACK_RANGES, rangecnt);
p = payload + 1;
dest->type = type;
p = ngtcp2_get_varint(&dest->largest_ack, p);
p = ngtcp2_get_uvarint(&dest->ack_delay, p);
/* This value will be assigned in the upper layer. */
dest->ack_delay_unscaled = 0;
dest->rangecnt = max_rangecnt;
p += nrangecnt;
p = ngtcp2_get_uvarint(&dest->first_ack_range, p);
for (i = 0; i < max_rangecnt; ++i) {
range = &dest->ranges[i];
p = ngtcp2_get_uvarint(&range->gap, p);
p = ngtcp2_get_uvarint(&range->len, p);
}
for (i = max_rangecnt; i < rangecnt; ++i) {
p += ngtcp2_get_uvarintlen(p);
p += ngtcp2_get_uvarintlen(p);
}
if (type == NGTCP2_FRAME_ACK_ECN) {
p = ngtcp2_get_uvarint(&dest->ecn.ect0, p);
p = ngtcp2_get_uvarint(&dest->ecn.ect1, p);
p = ngtcp2_get_uvarint(&dest->ecn.ce, p);
}
assert((size_t)(p - payload) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_decode_padding_frame(ngtcp2_padding *dest,
const uint8_t *payload,
size_t payloadlen) {
const uint8_t *p, *ep;
assert(payloadlen > 0);
p = payload + 1;
ep = payload + payloadlen;
for (; p != ep && *p == NGTCP2_FRAME_PADDING; ++p)
;
dest->type = NGTCP2_FRAME_PADDING;
dest->len = (size_t)(p - payload);
return (ngtcp2_ssize)dest->len;
}
ngtcp2_ssize ngtcp2_pkt_decode_reset_stream_frame(ngtcp2_reset_stream *dest,
const uint8_t *payload,
size_t payloadlen) {
size_t len = 1 + 1 + 1 + 1;
const uint8_t *p;
size_t n;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p = payload + 1;
n = ngtcp2_get_uvarintlen(p);
len += n - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p += n;
n = ngtcp2_get_uvarintlen(p);
len += n - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p += n;
n = ngtcp2_get_uvarintlen(p);
len += n - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p = payload + 1;
dest->type = NGTCP2_FRAME_RESET_STREAM;
p = ngtcp2_get_varint(&dest->stream_id, p);
p = ngtcp2_get_uvarint(&dest->app_error_code, p);
p = ngtcp2_get_uvarint(&dest->final_size, p);
assert((size_t)(p - payload) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_decode_connection_close_frame(
ngtcp2_connection_close *dest, const uint8_t *payload, size_t payloadlen) {
size_t len = 1 + 1 + 1;
const uint8_t *p;
size_t reasonlen;
size_t nreasonlen;
size_t n;
uint8_t type;
uint64_t vi;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
type = payload[0];
p = payload + 1;
n = ngtcp2_get_uvarintlen(p);
len += n - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p += n;
if (type == NGTCP2_FRAME_CONNECTION_CLOSE) {
++len;
n = ngtcp2_get_uvarintlen(p);
len += n - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p += n;
}
nreasonlen = ngtcp2_get_uvarintlen(p);
len += nreasonlen - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p = ngtcp2_get_uvarint(&vi, p);
if (payloadlen - len < vi) {
return NGTCP2_ERR_FRAME_ENCODING;
}
reasonlen = (size_t)vi;
len += reasonlen;
p = payload + 1;
dest->type = type;
p = ngtcp2_get_uvarint(&dest->error_code, p);
if (type == NGTCP2_FRAME_CONNECTION_CLOSE) {
p = ngtcp2_get_uvarint(&dest->frame_type, p);
} else {
dest->frame_type = 0;
}
dest->reasonlen = reasonlen;
p += nreasonlen;
if (reasonlen == 0) {
dest->reason = NULL;
} else {
dest->reason = (uint8_t *)p;
p += reasonlen;
}
assert((size_t)(p - payload) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_decode_max_data_frame(ngtcp2_max_data *dest,
const uint8_t *payload,
size_t payloadlen) {
size_t len = 1 + 1;
const uint8_t *p;
size_t n;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p = payload + 1;
n = ngtcp2_get_uvarintlen(p);
len += n - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
dest->type = NGTCP2_FRAME_MAX_DATA;
p = ngtcp2_get_uvarint(&dest->max_data, p);
assert((size_t)(p - payload) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_decode_max_stream_data_frame(
ngtcp2_max_stream_data *dest, const uint8_t *payload, size_t payloadlen) {
size_t len = 1 + 1 + 1;
const uint8_t *p;
size_t n;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p = payload + 1;
n = ngtcp2_get_uvarintlen(p);
len += n - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p += n;
n = ngtcp2_get_uvarintlen(p);
len += n - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p = payload + 1;
dest->type = NGTCP2_FRAME_MAX_STREAM_DATA;
p = ngtcp2_get_varint(&dest->stream_id, p);
p = ngtcp2_get_uvarint(&dest->max_stream_data, p);
assert((size_t)(p - payload) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_decode_max_streams_frame(ngtcp2_max_streams *dest,
const uint8_t *payload,
size_t payloadlen) {
size_t len = 1 + 1;
const uint8_t *p;
size_t n;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p = payload + 1;
n = ngtcp2_get_uvarintlen(p);
len += n - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
dest->type = payload[0];
p = ngtcp2_get_uvarint(&dest->max_streams, p);
assert((size_t)(p - payload) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_decode_ping_frame(ngtcp2_ping *dest,
const uint8_t *payload,
size_t payloadlen) {
(void)payload;
(void)payloadlen;
dest->type = NGTCP2_FRAME_PING;
return 1;
}
ngtcp2_ssize ngtcp2_pkt_decode_data_blocked_frame(ngtcp2_data_blocked *dest,
const uint8_t *payload,
size_t payloadlen) {
size_t len = 1 + 1;
const uint8_t *p;
size_t n;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p = payload + 1;
n = ngtcp2_get_uvarintlen(p);
len += n - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
dest->type = NGTCP2_FRAME_DATA_BLOCKED;
p = ngtcp2_get_uvarint(&dest->offset, p);
assert((size_t)(p - payload) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize
ngtcp2_pkt_decode_stream_data_blocked_frame(ngtcp2_stream_data_blocked *dest,
const uint8_t *payload,
size_t payloadlen) {
size_t len = 1 + 1 + 1;
const uint8_t *p;
size_t n;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p = payload + 1;
n = ngtcp2_get_uvarintlen(p);
len += n - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p += n;
n = ngtcp2_get_uvarintlen(p);
len += n - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p = payload + 1;
dest->type = NGTCP2_FRAME_STREAM_DATA_BLOCKED;
p = ngtcp2_get_varint(&dest->stream_id, p);
p = ngtcp2_get_uvarint(&dest->offset, p);
assert((size_t)(p - payload) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_decode_streams_blocked_frame(
ngtcp2_streams_blocked *dest, const uint8_t *payload, size_t payloadlen) {
size_t len = 1 + 1;
const uint8_t *p;
size_t n;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p = payload + 1;
n = ngtcp2_get_uvarintlen(p);
len += n - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
dest->type = payload[0];
p = ngtcp2_get_uvarint(&dest->max_streams, p);
assert((size_t)(p - payload) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_decode_new_connection_id_frame(
ngtcp2_new_connection_id *dest, const uint8_t *payload, size_t payloadlen) {
size_t len = 1 + 1 + 1 + 1 + 16;
const uint8_t *p;
size_t n;
size_t cil;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p = payload + 1;
n = ngtcp2_get_uvarintlen(p);
len += n - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p += n;
n = ngtcp2_get_uvarintlen(p);
len += n - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p += n;
cil = *p;
if (cil < NGTCP2_MIN_CIDLEN || cil > NGTCP2_MAX_CIDLEN) {
return NGTCP2_ERR_FRAME_ENCODING;
}
len += cil;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p = payload + 1;
dest->type = NGTCP2_FRAME_NEW_CONNECTION_ID;
p = ngtcp2_get_uvarint(&dest->seq, p);
p = ngtcp2_get_uvarint(&dest->retire_prior_to, p);
++p;
ngtcp2_cid_init(&dest->cid, p, cil);
p += cil;
p = ngtcp2_get_bytes(dest->stateless_reset_token, p,
NGTCP2_STATELESS_RESET_TOKENLEN);
assert((size_t)(p - payload) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_decode_stop_sending_frame(ngtcp2_stop_sending *dest,
const uint8_t *payload,
size_t payloadlen) {
size_t len = 1 + 1 + 1;
const uint8_t *p;
size_t n;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p = payload + 1;
n = ngtcp2_get_uvarintlen(p);
len += n - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p += n;
n = ngtcp2_get_uvarintlen(p);
len += n - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p = payload + 1;
dest->type = NGTCP2_FRAME_STOP_SENDING;
p = ngtcp2_get_varint(&dest->stream_id, p);
p = ngtcp2_get_uvarint(&dest->app_error_code, p);
assert((size_t)(p - payload) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_decode_path_challenge_frame(ngtcp2_path_challenge *dest,
const uint8_t *payload,
size_t payloadlen) {
size_t len = 1 + 8;
const uint8_t *p;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p = payload + 1;
dest->type = NGTCP2_FRAME_PATH_CHALLENGE;
ngtcp2_cpymem(dest->data, p, sizeof(dest->data));
p += sizeof(dest->data);
assert((size_t)(p - payload) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_decode_path_response_frame(ngtcp2_path_response *dest,
const uint8_t *payload,
size_t payloadlen) {
size_t len = 1 + 8;
const uint8_t *p;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p = payload + 1;
dest->type = NGTCP2_FRAME_PATH_RESPONSE;
ngtcp2_cpymem(dest->data, p, sizeof(dest->data));
p += sizeof(dest->data);
assert((size_t)(p - payload) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_decode_crypto_frame(ngtcp2_stream *dest,
const uint8_t *payload,
size_t payloadlen) {
size_t len = 1 + 1 + 1;
const uint8_t *p;
size_t datalen;
size_t ndatalen;
size_t n;
uint64_t vi;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p = payload + 1;
n = ngtcp2_get_uvarintlen(p);
len += n - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p += n;
ndatalen = ngtcp2_get_uvarintlen(p);
len += ndatalen - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p = ngtcp2_get_uvarint(&vi, p);
if (payloadlen - len < vi) {
return NGTCP2_ERR_FRAME_ENCODING;
}
datalen = (size_t)vi;
len += datalen;
p = payload + 1;
dest->type = NGTCP2_FRAME_CRYPTO;
dest->flags = 0;
dest->fin = 0;
dest->stream_id = 0;
p = ngtcp2_get_uvarint(&dest->offset, p);
dest->data[0].len = datalen;
p += ndatalen;
if (dest->data[0].len) {
dest->data[0].base = (uint8_t *)p;
p += dest->data[0].len;
dest->datacnt = 1;
} else {
dest->data[0].base = NULL;
dest->datacnt = 0;
}
assert((size_t)(p - payload) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_decode_new_token_frame(ngtcp2_new_token *dest,
const uint8_t *payload,
size_t payloadlen) {
size_t len = 1 + 1;
const uint8_t *p;
size_t n;
size_t datalen;
uint64_t vi;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p = payload + 1;
n = ngtcp2_get_uvarintlen(p);
len += n - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p = ngtcp2_get_uvarint(&vi, p);
if (payloadlen - len < vi) {
return NGTCP2_ERR_FRAME_ENCODING;
}
datalen = (size_t)vi;
len += datalen;
dest->type = NGTCP2_FRAME_NEW_TOKEN;
dest->tokenlen = datalen;
dest->token = (uint8_t *)p;
p += dest->tokenlen;
assert((size_t)(p - payload) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize
ngtcp2_pkt_decode_retire_connection_id_frame(ngtcp2_retire_connection_id *dest,
const uint8_t *payload,
size_t payloadlen) {
size_t len = 1 + 1;
const uint8_t *p;
size_t n;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p = payload + 1;
n = ngtcp2_get_uvarintlen(p);
len += n - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
dest->type = NGTCP2_FRAME_RETIRE_CONNECTION_ID;
p = ngtcp2_get_uvarint(&dest->seq, p);
assert((size_t)(p - payload) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_decode_handshake_done_frame(ngtcp2_handshake_done *dest,
const uint8_t *payload,
size_t payloadlen) {
(void)payload;
(void)payloadlen;
dest->type = NGTCP2_FRAME_HANDSHAKE_DONE;
return 1;
}
ngtcp2_ssize ngtcp2_pkt_decode_datagram_frame(ngtcp2_datagram *dest,
const uint8_t *payload,
size_t payloadlen) {
size_t len = 1;
const uint8_t *p;
uint8_t type;
size_t datalen;
size_t n;
uint64_t vi;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
type = payload[0];
p = payload + 1;
switch (type) {
case NGTCP2_FRAME_DATAGRAM:
datalen = payloadlen - 1;
len = payloadlen;
break;
case NGTCP2_FRAME_DATAGRAM_LEN:
++len;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
n = ngtcp2_get_uvarintlen(p);
len += n - 1;
if (payloadlen < len) {
return NGTCP2_ERR_FRAME_ENCODING;
}
p = ngtcp2_get_uvarint(&vi, p);
if (payloadlen - len < vi) {
return NGTCP2_ERR_FRAME_ENCODING;
}
datalen = (size_t)vi;
len += datalen;
break;
default:
ngtcp2_unreachable();
}
dest->type = type;
if (datalen == 0) {
dest->datacnt = 0;
dest->data = NULL;
} else {
dest->datacnt = 1;
dest->data = dest->rdata;
dest->rdata[0].len = datalen;
dest->rdata[0].base = (uint8_t *)p;
p += datalen;
}
assert((size_t)(p - payload) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_encode_frame(uint8_t *out, size_t outlen,
ngtcp2_frame *fr) {
switch (fr->type) {
case NGTCP2_FRAME_STREAM:
return ngtcp2_pkt_encode_stream_frame(out, outlen, &fr->stream);
case NGTCP2_FRAME_ACK:
case NGTCP2_FRAME_ACK_ECN:
return ngtcp2_pkt_encode_ack_frame(out, outlen, &fr->ack);
case NGTCP2_FRAME_PADDING:
return ngtcp2_pkt_encode_padding_frame(out, outlen, &fr->padding);
case NGTCP2_FRAME_RESET_STREAM:
return ngtcp2_pkt_encode_reset_stream_frame(out, outlen, &fr->reset_stream);
case NGTCP2_FRAME_CONNECTION_CLOSE:
case NGTCP2_FRAME_CONNECTION_CLOSE_APP:
return ngtcp2_pkt_encode_connection_close_frame(out, outlen,
&fr->connection_close);
case NGTCP2_FRAME_MAX_DATA:
return ngtcp2_pkt_encode_max_data_frame(out, outlen, &fr->max_data);
case NGTCP2_FRAME_MAX_STREAM_DATA:
return ngtcp2_pkt_encode_max_stream_data_frame(out, outlen,
&fr->max_stream_data);
case NGTCP2_FRAME_MAX_STREAMS_BIDI:
case NGTCP2_FRAME_MAX_STREAMS_UNI:
return ngtcp2_pkt_encode_max_streams_frame(out, outlen, &fr->max_streams);
case NGTCP2_FRAME_PING:
return ngtcp2_pkt_encode_ping_frame(out, outlen, &fr->ping);
case NGTCP2_FRAME_DATA_BLOCKED:
return ngtcp2_pkt_encode_data_blocked_frame(out, outlen, &fr->data_blocked);
case NGTCP2_FRAME_STREAM_DATA_BLOCKED:
return ngtcp2_pkt_encode_stream_data_blocked_frame(
out, outlen, &fr->stream_data_blocked);
case NGTCP2_FRAME_STREAMS_BLOCKED_BIDI:
case NGTCP2_FRAME_STREAMS_BLOCKED_UNI:
return ngtcp2_pkt_encode_streams_blocked_frame(out, outlen,
&fr->streams_blocked);
case NGTCP2_FRAME_NEW_CONNECTION_ID:
return ngtcp2_pkt_encode_new_connection_id_frame(out, outlen,
&fr->new_connection_id);
case NGTCP2_FRAME_STOP_SENDING:
return ngtcp2_pkt_encode_stop_sending_frame(out, outlen, &fr->stop_sending);
case NGTCP2_FRAME_PATH_CHALLENGE:
return ngtcp2_pkt_encode_path_challenge_frame(out, outlen,
&fr->path_challenge);
case NGTCP2_FRAME_PATH_RESPONSE:
return ngtcp2_pkt_encode_path_response_frame(out, outlen,
&fr->path_response);
case NGTCP2_FRAME_CRYPTO:
return ngtcp2_pkt_encode_crypto_frame(out, outlen, &fr->stream);
case NGTCP2_FRAME_NEW_TOKEN:
return ngtcp2_pkt_encode_new_token_frame(out, outlen, &fr->new_token);
case NGTCP2_FRAME_RETIRE_CONNECTION_ID:
return ngtcp2_pkt_encode_retire_connection_id_frame(
out, outlen, &fr->retire_connection_id);
case NGTCP2_FRAME_HANDSHAKE_DONE:
return ngtcp2_pkt_encode_handshake_done_frame(out, outlen,
&fr->handshake_done);
case NGTCP2_FRAME_DATAGRAM:
case NGTCP2_FRAME_DATAGRAM_LEN:
return ngtcp2_pkt_encode_datagram_frame(out, outlen, &fr->datagram);
default:
return NGTCP2_ERR_INVALID_ARGUMENT;
}
}
ngtcp2_ssize ngtcp2_pkt_encode_stream_frame(uint8_t *out, size_t outlen,
ngtcp2_stream *fr) {
size_t len = 1;
uint8_t flags = NGTCP2_STREAM_LEN_BIT;
uint8_t *p;
size_t i;
size_t datalen = 0;
if (fr->fin) {
flags |= NGTCP2_STREAM_FIN_BIT;
}
if (fr->offset) {
flags |= NGTCP2_STREAM_OFF_BIT;
len += ngtcp2_put_uvarintlen(fr->offset);
}
len += ngtcp2_put_uvarintlen((uint64_t)fr->stream_id);
for (i = 0; i < fr->datacnt; ++i) {
datalen += fr->data[i].len;
}
len += ngtcp2_put_uvarintlen(datalen);
len += datalen;
if (outlen < len) {
return NGTCP2_ERR_NOBUF;
}
p = out;
*p++ = flags | NGTCP2_FRAME_STREAM;
fr->flags = flags;
p = ngtcp2_put_uvarint(p, (uint64_t)fr->stream_id);
if (fr->offset) {
p = ngtcp2_put_uvarint(p, fr->offset);
}
p = ngtcp2_put_uvarint(p, datalen);
for (i = 0; i < fr->datacnt; ++i) {
assert(fr->data[i].len);
assert(fr->data[i].base);
p = ngtcp2_cpymem(p, fr->data[i].base, fr->data[i].len);
}
assert((size_t)(p - out) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_encode_ack_frame(uint8_t *out, size_t outlen,
ngtcp2_ack *fr) {
size_t len = 1 + ngtcp2_put_uvarintlen((uint64_t)fr->largest_ack) +
ngtcp2_put_uvarintlen(fr->ack_delay) +
ngtcp2_put_uvarintlen(fr->rangecnt) +
ngtcp2_put_uvarintlen(fr->first_ack_range);
uint8_t *p;
size_t i;
const ngtcp2_ack_range *range;
for (i = 0; i < fr->rangecnt; ++i) {
range = &fr->ranges[i];
len += ngtcp2_put_uvarintlen(range->gap);
len += ngtcp2_put_uvarintlen(range->len);
}
if (fr->type == NGTCP2_FRAME_ACK_ECN) {
len += ngtcp2_put_uvarintlen(fr->ecn.ect0) +
ngtcp2_put_uvarintlen(fr->ecn.ect1) +
ngtcp2_put_uvarintlen(fr->ecn.ce);
}
if (outlen < len) {
return NGTCP2_ERR_NOBUF;
}
p = out;
*p++ = (uint8_t)fr->type;
p = ngtcp2_put_uvarint(p, (uint64_t)fr->largest_ack);
p = ngtcp2_put_uvarint(p, fr->ack_delay);
p = ngtcp2_put_uvarint(p, fr->rangecnt);
p = ngtcp2_put_uvarint(p, fr->first_ack_range);
for (i = 0; i < fr->rangecnt; ++i) {
range = &fr->ranges[i];
p = ngtcp2_put_uvarint(p, range->gap);
p = ngtcp2_put_uvarint(p, range->len);
}
if (fr->type == NGTCP2_FRAME_ACK_ECN) {
p = ngtcp2_put_uvarint(p, fr->ecn.ect0);
p = ngtcp2_put_uvarint(p, fr->ecn.ect1);
p = ngtcp2_put_uvarint(p, fr->ecn.ce);
}
assert((size_t)(p - out) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_encode_padding_frame(uint8_t *out, size_t outlen,
const ngtcp2_padding *fr) {
if (outlen < fr->len) {
return NGTCP2_ERR_NOBUF;
}
memset(out, 0, fr->len);
return (ngtcp2_ssize)fr->len;
}
ngtcp2_ssize
ngtcp2_pkt_encode_reset_stream_frame(uint8_t *out, size_t outlen,
const ngtcp2_reset_stream *fr) {
size_t len = 1 + ngtcp2_put_uvarintlen((uint64_t)fr->stream_id) +
ngtcp2_put_uvarintlen(fr->app_error_code) +
ngtcp2_put_uvarintlen(fr->final_size);
uint8_t *p;
if (outlen < len) {
return NGTCP2_ERR_NOBUF;
}
p = out;
*p++ = NGTCP2_FRAME_RESET_STREAM;
p = ngtcp2_put_uvarint(p, (uint64_t)fr->stream_id);
p = ngtcp2_put_uvarint(p, fr->app_error_code);
p = ngtcp2_put_uvarint(p, fr->final_size);
assert((size_t)(p - out) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize
ngtcp2_pkt_encode_connection_close_frame(uint8_t *out, size_t outlen,
const ngtcp2_connection_close *fr) {
size_t len = 1 + ngtcp2_put_uvarintlen(fr->error_code) +
(fr->type == NGTCP2_FRAME_CONNECTION_CLOSE
? ngtcp2_put_uvarintlen(fr->frame_type)
: 0) +
ngtcp2_put_uvarintlen(fr->reasonlen) + fr->reasonlen;
uint8_t *p;
if (outlen < len) {
return NGTCP2_ERR_NOBUF;
}
p = out;
*p++ = (uint8_t)fr->type;
p = ngtcp2_put_uvarint(p, fr->error_code);
if (fr->type == NGTCP2_FRAME_CONNECTION_CLOSE) {
p = ngtcp2_put_uvarint(p, fr->frame_type);
}
p = ngtcp2_put_uvarint(p, fr->reasonlen);
if (fr->reasonlen) {
p = ngtcp2_cpymem(p, fr->reason, fr->reasonlen);
}
assert((size_t)(p - out) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_encode_max_data_frame(uint8_t *out, size_t outlen,
const ngtcp2_max_data *fr) {
size_t len = 1 + ngtcp2_put_uvarintlen(fr->max_data);
uint8_t *p;
if (outlen < len) {
return NGTCP2_ERR_NOBUF;
}
p = out;
*p++ = NGTCP2_FRAME_MAX_DATA;
p = ngtcp2_put_uvarint(p, fr->max_data);
assert((size_t)(p - out) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize
ngtcp2_pkt_encode_max_stream_data_frame(uint8_t *out, size_t outlen,
const ngtcp2_max_stream_data *fr) {
size_t len = 1 + ngtcp2_put_uvarintlen((uint64_t)fr->stream_id) +
ngtcp2_put_uvarintlen(fr->max_stream_data);
uint8_t *p;
if (outlen < len) {
return NGTCP2_ERR_NOBUF;
}
p = out;
*p++ = NGTCP2_FRAME_MAX_STREAM_DATA;
p = ngtcp2_put_uvarint(p, (uint64_t)fr->stream_id);
p = ngtcp2_put_uvarint(p, fr->max_stream_data);
assert((size_t)(p - out) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_encode_max_streams_frame(uint8_t *out, size_t outlen,
const ngtcp2_max_streams *fr) {
size_t len = 1 + ngtcp2_put_uvarintlen(fr->max_streams);
uint8_t *p;
if (outlen < len) {
return NGTCP2_ERR_NOBUF;
}
p = out;
*p++ = (uint8_t)fr->type;
p = ngtcp2_put_uvarint(p, fr->max_streams);
assert((size_t)(p - out) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_encode_ping_frame(uint8_t *out, size_t outlen,
const ngtcp2_ping *fr) {
(void)fr;
if (outlen < 1) {
return NGTCP2_ERR_NOBUF;
}
*out++ = NGTCP2_FRAME_PING;
return 1;
}
ngtcp2_ssize
ngtcp2_pkt_encode_data_blocked_frame(uint8_t *out, size_t outlen,
const ngtcp2_data_blocked *fr) {
size_t len = 1 + ngtcp2_put_uvarintlen(fr->offset);
uint8_t *p;
if (outlen < len) {
return NGTCP2_ERR_NOBUF;
}
p = out;
*p++ = NGTCP2_FRAME_DATA_BLOCKED;
p = ngtcp2_put_uvarint(p, fr->offset);
assert((size_t)(p - out) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_encode_stream_data_blocked_frame(
uint8_t *out, size_t outlen, const ngtcp2_stream_data_blocked *fr) {
size_t len = 1 + ngtcp2_put_uvarintlen((uint64_t)fr->stream_id) +
ngtcp2_put_uvarintlen(fr->offset);
uint8_t *p;
if (outlen < len) {
return NGTCP2_ERR_NOBUF;
}
p = out;
*p++ = NGTCP2_FRAME_STREAM_DATA_BLOCKED;
p = ngtcp2_put_uvarint(p, (uint64_t)fr->stream_id);
p = ngtcp2_put_uvarint(p, fr->offset);
assert((size_t)(p - out) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize
ngtcp2_pkt_encode_streams_blocked_frame(uint8_t *out, size_t outlen,
const ngtcp2_streams_blocked *fr) {
size_t len = 1 + ngtcp2_put_uvarintlen(fr->max_streams);
uint8_t *p;
if (outlen < len) {
return NGTCP2_ERR_NOBUF;
}
p = out;
*p++ = (uint8_t)fr->type;
p = ngtcp2_put_uvarint(p, fr->max_streams);
assert((size_t)(p - out) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize
ngtcp2_pkt_encode_new_connection_id_frame(uint8_t *out, size_t outlen,
const ngtcp2_new_connection_id *fr) {
size_t len = 1 + ngtcp2_put_uvarintlen(fr->seq) +
ngtcp2_put_uvarintlen(fr->retire_prior_to) + 1 +
fr->cid.datalen + NGTCP2_STATELESS_RESET_TOKENLEN;
uint8_t *p;
if (outlen < len) {
return NGTCP2_ERR_NOBUF;
}
p = out;
*p++ = NGTCP2_FRAME_NEW_CONNECTION_ID;
p = ngtcp2_put_uvarint(p, fr->seq);
p = ngtcp2_put_uvarint(p, fr->retire_prior_to);
*p++ = (uint8_t)fr->cid.datalen;
p = ngtcp2_cpymem(p, fr->cid.data, fr->cid.datalen);
p = ngtcp2_cpymem(p, fr->stateless_reset_token,
NGTCP2_STATELESS_RESET_TOKENLEN);
assert((size_t)(p - out) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize
ngtcp2_pkt_encode_stop_sending_frame(uint8_t *out, size_t outlen,
const ngtcp2_stop_sending *fr) {
size_t len = 1 + ngtcp2_put_uvarintlen((uint64_t)fr->stream_id) +
ngtcp2_put_uvarintlen(fr->app_error_code);
uint8_t *p;
if (outlen < len) {
return NGTCP2_ERR_NOBUF;
}
p = out;
*p++ = NGTCP2_FRAME_STOP_SENDING;
p = ngtcp2_put_uvarint(p, (uint64_t)fr->stream_id);
p = ngtcp2_put_uvarint(p, fr->app_error_code);
assert((size_t)(p - out) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize
ngtcp2_pkt_encode_path_challenge_frame(uint8_t *out, size_t outlen,
const ngtcp2_path_challenge *fr) {
size_t len = 1 + 8;
uint8_t *p;
if (outlen < len) {
return NGTCP2_ERR_NOBUF;
}
p = out;
*p++ = NGTCP2_FRAME_PATH_CHALLENGE;
p = ngtcp2_cpymem(p, fr->data, sizeof(fr->data));
assert((size_t)(p - out) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize
ngtcp2_pkt_encode_path_response_frame(uint8_t *out, size_t outlen,
const ngtcp2_path_response *fr) {
size_t len = 1 + 8;
uint8_t *p;
if (outlen < len) {
return NGTCP2_ERR_NOBUF;
}
p = out;
*p++ = NGTCP2_FRAME_PATH_RESPONSE;
p = ngtcp2_cpymem(p, fr->data, sizeof(fr->data));
assert((size_t)(p - out) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_encode_crypto_frame(uint8_t *out, size_t outlen,
const ngtcp2_stream *fr) {
size_t len = 1;
uint8_t *p;
size_t i;
size_t datalen = 0;
len += ngtcp2_put_uvarintlen(fr->offset);
for (i = 0; i < fr->datacnt; ++i) {
datalen += fr->data[i].len;
}
len += ngtcp2_put_uvarintlen(datalen);
len += datalen;
if (outlen < len) {
return NGTCP2_ERR_NOBUF;
}
p = out;
*p++ = NGTCP2_FRAME_CRYPTO;
p = ngtcp2_put_uvarint(p, fr->offset);
p = ngtcp2_put_uvarint(p, datalen);
for (i = 0; i < fr->datacnt; ++i) {
assert(fr->data[i].base);
p = ngtcp2_cpymem(p, fr->data[i].base, fr->data[i].len);
}
assert((size_t)(p - out) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_encode_new_token_frame(uint8_t *out, size_t outlen,
const ngtcp2_new_token *fr) {
size_t len = 1 + ngtcp2_put_uvarintlen(fr->tokenlen) + fr->tokenlen;
uint8_t *p;
assert(fr->tokenlen);
if (outlen < len) {
return NGTCP2_ERR_NOBUF;
}
p = out;
*p++ = NGTCP2_FRAME_NEW_TOKEN;
p = ngtcp2_put_uvarint(p, fr->tokenlen);
p = ngtcp2_cpymem(p, fr->token, fr->tokenlen);
assert((size_t)(p - out) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_encode_retire_connection_id_frame(
uint8_t *out, size_t outlen, const ngtcp2_retire_connection_id *fr) {
size_t len = 1 + ngtcp2_put_uvarintlen(fr->seq);
uint8_t *p;
if (outlen < len) {
return NGTCP2_ERR_NOBUF;
}
p = out;
*p++ = NGTCP2_FRAME_RETIRE_CONNECTION_ID;
p = ngtcp2_put_uvarint(p, fr->seq);
assert((size_t)(p - out) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize
ngtcp2_pkt_encode_handshake_done_frame(uint8_t *out, size_t outlen,
const ngtcp2_handshake_done *fr) {
(void)fr;
if (outlen < 1) {
return NGTCP2_ERR_NOBUF;
}
*out++ = NGTCP2_FRAME_HANDSHAKE_DONE;
return 1;
}
ngtcp2_ssize ngtcp2_pkt_encode_datagram_frame(uint8_t *out, size_t outlen,
const ngtcp2_datagram *fr) {
uint64_t datalen = ngtcp2_vec_len(fr->data, fr->datacnt);
uint64_t len =
1 +
(fr->type == NGTCP2_FRAME_DATAGRAM ? 0 : ngtcp2_put_uvarintlen(datalen)) +
datalen;
uint8_t *p;
size_t i;
assert(fr->type == NGTCP2_FRAME_DATAGRAM ||
fr->type == NGTCP2_FRAME_DATAGRAM_LEN);
if (outlen < len) {
return NGTCP2_ERR_NOBUF;
}
p = out;
*p++ = (uint8_t)fr->type;
if (fr->type == NGTCP2_FRAME_DATAGRAM_LEN) {
p = ngtcp2_put_uvarint(p, datalen);
}
for (i = 0; i < fr->datacnt; ++i) {
assert(fr->data[i].len);
assert(fr->data[i].base);
p = ngtcp2_cpymem(p, fr->data[i].base, fr->data[i].len);
}
assert((size_t)(p - out) == len);
return (ngtcp2_ssize)len;
}
ngtcp2_ssize ngtcp2_pkt_write_version_negotiation(
uint8_t *dest, size_t destlen, uint8_t unused_random, const uint8_t *dcid,
size_t dcidlen, const uint8_t *scid, size_t scidlen, const uint32_t *sv,
size_t nsv) {
size_t len = 1 + 4 + 1 + dcidlen + 1 + scidlen + nsv * 4;
uint8_t *p;
size_t i;
assert(dcidlen < 256);
assert(scidlen < 256);
if (destlen < len) {
return NGTCP2_ERR_NOBUF;
}
p = dest;
*p++ = 0xc0 | unused_random;
p = ngtcp2_put_uint32be(p, 0);
*p++ = (uint8_t)dcidlen;
if (dcidlen) {
p = ngtcp2_cpymem(p, dcid, dcidlen);
}
*p++ = (uint8_t)scidlen;
if (scidlen) {
p = ngtcp2_cpymem(p, scid, scidlen);
}
for (i = 0; i < nsv; ++i) {
p = ngtcp2_put_uint32be(p, sv[i]);
}
assert((size_t)(p - dest) == len);
return (ngtcp2_ssize)len;
}
size_t ngtcp2_pkt_decode_version_negotiation(uint32_t *dest,
const uint8_t *payload,
size_t payloadlen) {
const uint8_t *end = payload + payloadlen;
assert((payloadlen % sizeof(uint32_t)) == 0);
for (; payload != end;) {
payload = ngtcp2_get_uint32(dest++, payload);
}
return payloadlen / sizeof(uint32_t);
}
int ngtcp2_pkt_decode_stateless_reset(ngtcp2_pkt_stateless_reset *sr,
const uint8_t *payload,
size_t payloadlen) {
const uint8_t *p = payload;
if (payloadlen <
NGTCP2_MIN_STATELESS_RESET_RANDLEN + NGTCP2_STATELESS_RESET_TOKENLEN) {
return NGTCP2_ERR_INVALID_ARGUMENT;
}
sr->rand = p;
sr->randlen = payloadlen - NGTCP2_STATELESS_RESET_TOKENLEN;
p += sr->randlen;
memcpy(sr->stateless_reset_token, p, NGTCP2_STATELESS_RESET_TOKENLEN);
return 0;
}
int ngtcp2_pkt_decode_retry(ngtcp2_pkt_retry *dest, const uint8_t *payload,
size_t payloadlen) {
size_t len = /* token */ 1 + NGTCP2_RETRY_TAGLEN;
if (payloadlen < len) {
return NGTCP2_ERR_INVALID_ARGUMENT;
}
dest->token = (uint8_t *)payload;
dest->tokenlen = (size_t)(payloadlen - NGTCP2_RETRY_TAGLEN);
ngtcp2_cpymem(dest->tag, payload + dest->tokenlen, NGTCP2_RETRY_TAGLEN);
return 0;
}
int64_t ngtcp2_pkt_adjust_pkt_num(int64_t max_pkt_num, int64_t pkt_num,
size_t pkt_numlen) {
int64_t expected = max_pkt_num + 1;
int64_t win = (int64_t)1 << (pkt_numlen * 8);
int64_t hwin = win / 2;
int64_t mask = win - 1;
int64_t cand = (expected & ~mask) | pkt_num;
if (cand <= expected - hwin) {
assert(cand <= (int64_t)NGTCP2_MAX_VARINT - win);
return cand + win;
}
if (cand > expected + hwin && cand >= win) {
return cand - win;
}
return cand;
}
int ngtcp2_pkt_validate_ack(ngtcp2_ack *fr, int64_t min_pkt_num) {
int64_t largest_ack = fr->largest_ack;
size_t i;
if (largest_ack < (int64_t)fr->first_ack_range) {
return NGTCP2_ERR_ACK_FRAME;
}
largest_ack -= (int64_t)fr->first_ack_range;
if (largest_ack < min_pkt_num) {
return NGTCP2_ERR_PROTO;
}
for (i = 0; i < fr->rangecnt; ++i) {
if (largest_ack < (int64_t)fr->ranges[i].gap + 2) {
return NGTCP2_ERR_ACK_FRAME;
}
largest_ack -= (int64_t)fr->ranges[i].gap + 2;
if (largest_ack < (int64_t)fr->ranges[i].len) {
return NGTCP2_ERR_ACK_FRAME;
}
largest_ack -= (int64_t)fr->ranges[i].len;
if (largest_ack < min_pkt_num) {
return NGTCP2_ERR_PROTO;
}
}
return 0;
}
ngtcp2_ssize
ngtcp2_pkt_write_stateless_reset(uint8_t *dest, size_t destlen,
const uint8_t *stateless_reset_token,
const uint8_t *rand, size_t randlen) {
uint8_t *p;
if (destlen <
NGTCP2_MIN_STATELESS_RESET_RANDLEN + NGTCP2_STATELESS_RESET_TOKENLEN) {
return NGTCP2_ERR_NOBUF;
}
if (randlen < NGTCP2_MIN_STATELESS_RESET_RANDLEN) {
return NGTCP2_ERR_INVALID_ARGUMENT;
}
p = dest;
randlen = ngtcp2_min(destlen - NGTCP2_STATELESS_RESET_TOKENLEN, randlen);
p = ngtcp2_cpymem(p, rand, randlen);
p = ngtcp2_cpymem(p, stateless_reset_token, NGTCP2_STATELESS_RESET_TOKENLEN);
*dest = (uint8_t)((*dest & 0x7fu) | 0x40u);
return p - dest;
}
ngtcp2_ssize ngtcp2_pkt_write_retry(
uint8_t *dest, size_t destlen, uint32_t version, const ngtcp2_cid *dcid,
const ngtcp2_cid *scid, const ngtcp2_cid *odcid, const uint8_t *token,
size_t tokenlen, ngtcp2_encrypt encrypt, const ngtcp2_crypto_aead *aead,
const ngtcp2_crypto_aead_ctx *aead_ctx) {
ngtcp2_pkt_hd hd;
uint8_t pseudo_retry[1500];
ngtcp2_ssize pseudo_retrylen;
uint8_t tag[NGTCP2_RETRY_TAGLEN];
int rv;
uint8_t *p;
size_t offset;
const uint8_t *nonce;
size_t noncelen;
assert(tokenlen > 0);
assert(!ngtcp2_cid_eq(scid, odcid));
/* Retry packet is sent at most once per one connection attempt. In
the first connection attempt, client has to send random DCID
which is at least NGTCP2_MIN_INITIAL_DCIDLEN bytes long. */
if (odcid->datalen < NGTCP2_MIN_INITIAL_DCIDLEN) {
return NGTCP2_ERR_INVALID_ARGUMENT;
}
ngtcp2_pkt_hd_init(&hd, NGTCP2_PKT_FLAG_LONG_FORM, NGTCP2_PKT_RETRY, dcid,
scid, /* pkt_num = */ 0, /* pkt_numlen = */ 1, version,
/* len = */ 0);
pseudo_retrylen =
ngtcp2_pkt_encode_pseudo_retry(pseudo_retry, sizeof(pseudo_retry), &hd,
/* unused = */ 0, odcid, token, tokenlen);
if (pseudo_retrylen < 0) {
return pseudo_retrylen;
}
switch (version) {
case NGTCP2_PROTO_VER_V1:
default:
nonce = (const uint8_t *)NGTCP2_RETRY_NONCE_V1;
noncelen = sizeof(NGTCP2_RETRY_NONCE_V1) - 1;
break;
case NGTCP2_PROTO_VER_V2:
nonce = (const uint8_t *)NGTCP2_RETRY_NONCE_V2;
noncelen = sizeof(NGTCP2_RETRY_NONCE_V2) - 1;
break;
}
/* OpenSSL does not like NULL plaintext. */
rv = encrypt(tag, aead, aead_ctx, (const uint8_t *)"", 0, nonce, noncelen,
pseudo_retry, (size_t)pseudo_retrylen);
if (rv != 0) {
return rv;
}
offset = 1 + odcid->datalen;
if (destlen < (size_t)pseudo_retrylen + sizeof(tag) - offset) {
return NGTCP2_ERR_NOBUF;
}
p = ngtcp2_cpymem(dest, pseudo_retry + offset,
(size_t)pseudo_retrylen - offset);
p = ngtcp2_cpymem(p, tag, sizeof(tag));
return p - dest;
}
ngtcp2_ssize ngtcp2_pkt_encode_pseudo_retry(
uint8_t *dest, size_t destlen, const ngtcp2_pkt_hd *hd, uint8_t unused,
const ngtcp2_cid *odcid, const uint8_t *token, size_t tokenlen) {
uint8_t *p = dest;
ngtcp2_ssize nwrite;
if (destlen < 1 + odcid->datalen) {
return NGTCP2_ERR_NOBUF;
}
*p++ = (uint8_t)odcid->datalen;
p = ngtcp2_cpymem(p, odcid->data, odcid->datalen);
destlen -= (size_t)(p - dest);
nwrite = ngtcp2_pkt_encode_hd_long(p, destlen, hd);
if (nwrite < 0) {
return nwrite;
}
if (destlen < (size_t)nwrite + tokenlen) {
return NGTCP2_ERR_NOBUF;
}
*p &= 0xf0;
*p |= unused;
p += nwrite;
p = ngtcp2_cpymem(p, token, tokenlen);
return p - dest;
}
int ngtcp2_pkt_verify_retry_tag(uint32_t version, const ngtcp2_pkt_retry *retry,
const uint8_t *pkt, size_t pktlen,
ngtcp2_encrypt encrypt,
const ngtcp2_crypto_aead *aead,
const ngtcp2_crypto_aead_ctx *aead_ctx) {
uint8_t pseudo_retry[1500];
size_t pseudo_retrylen;
uint8_t *p = pseudo_retry;
int rv;
uint8_t tag[NGTCP2_RETRY_TAGLEN];
const uint8_t *nonce;
size_t noncelen;
assert(pktlen >= sizeof(retry->tag));
if (sizeof(pseudo_retry) <
1 + retry->odcid.datalen + pktlen - sizeof(retry->tag)) {
return NGTCP2_ERR_PROTO;
}
*p++ = (uint8_t)retry->odcid.datalen;
p = ngtcp2_cpymem(p, retry->odcid.data, retry->odcid.datalen);
p = ngtcp2_cpymem(p, pkt, pktlen - sizeof(retry->tag));
pseudo_retrylen = (size_t)(p - pseudo_retry);
switch (version) {
case NGTCP2_PROTO_VER_V1:
default:
nonce = (const uint8_t *)NGTCP2_RETRY_NONCE_V1;
noncelen = sizeof(NGTCP2_RETRY_NONCE_V1) - 1;
break;
case NGTCP2_PROTO_VER_V2:
nonce = (const uint8_t *)NGTCP2_RETRY_NONCE_V2;
noncelen = sizeof(NGTCP2_RETRY_NONCE_V2) - 1;
break;
}
/* OpenSSL does not like NULL plaintext. */
rv = encrypt(tag, aead, aead_ctx, (const uint8_t *)"", 0, nonce, noncelen,
pseudo_retry, pseudo_retrylen);
if (rv != 0) {
return rv;
}
if (0 != memcmp(retry->tag, tag, sizeof(retry->tag))) {
return NGTCP2_ERR_PROTO;
}
return 0;
}
size_t ngtcp2_pkt_stream_max_datalen(int64_t stream_id, uint64_t offset,
uint64_t len, size_t left) {
size_t n = 1 /* type */ + ngtcp2_put_uvarintlen((uint64_t)stream_id) +
(offset ? ngtcp2_put_uvarintlen(offset) : 0);
if (left <= n) {
return (size_t)-1;
}
left -= n;
if (left > 8 + 1073741823 && len > 1073741823) {
#if SIZE_MAX > UINT32_MAX
len = ngtcp2_min(len, 4611686018427387903lu);
#endif /* SIZE_MAX > UINT32_MAX */
return (size_t)ngtcp2_min(len, (uint64_t)(left - 8));
}
if (left > 4 + 16383 && len > 16383) {
len = ngtcp2_min(len, 1073741823);
return (size_t)ngtcp2_min(len, (uint64_t)(left - 4));
}
if (left > 2 + 63 && len > 63) {
len = ngtcp2_min(len, 16383);
return (size_t)ngtcp2_min(len, (uint64_t)(left - 2));
}
len = ngtcp2_min(len, 63);
return (size_t)ngtcp2_min(len, (uint64_t)(left - 1));
}
size_t ngtcp2_pkt_crypto_max_datalen(uint64_t offset, size_t len, size_t left) {
size_t n = 1 /* type */ + ngtcp2_put_uvarintlen(offset);
/* CRYPTO frame must contain nonzero length data. Return -1 if
there is no space to write crypto data. */
if (left <= n + 1) {
return (size_t)-1;
}
left -= n;
if (left > 8 + 1073741823 && len > 1073741823) {
#if SIZE_MAX > UINT32_MAX
len = ngtcp2_min(len, 4611686018427387903lu);
#endif /* SIZE_MAX > UINT32_MAX */
return ngtcp2_min(len, left - 8);
}
if (left > 4 + 16383 && len > 16383) {
len = ngtcp2_min(len, 1073741823);
return ngtcp2_min(len, left - 4);
}
if (left > 2 + 63 && len > 63) {
len = ngtcp2_min(len, 16383);
return ngtcp2_min(len, left - 2);
}
len = ngtcp2_min(len, 63);
return ngtcp2_min(len, left - 1);
}
size_t ngtcp2_pkt_datagram_framelen(size_t len) {
return 1 /* type */ + ngtcp2_put_uvarintlen(len) + len;
}
int ngtcp2_is_supported_version(uint32_t version) {
switch (version) {
case NGTCP2_PROTO_VER_V1:
case NGTCP2_PROTO_VER_V2:
return 1;
default:
return 0;
}
}
int ngtcp2_is_reserved_version(uint32_t version) {
return (version & NGTCP2_RESERVED_VERSION_MASK) ==
NGTCP2_RESERVED_VERSION_MASK;
}
uint8_t ngtcp2_pkt_get_type_long(uint32_t version, uint8_t c) {
uint8_t pkt_type = (uint8_t)((c & NGTCP2_LONG_TYPE_MASK) >> 4);
switch (version) {
case NGTCP2_PROTO_VER_V2:
switch (pkt_type) {
case NGTCP2_PKT_TYPE_INITIAL_V2:
return NGTCP2_PKT_INITIAL;
case NGTCP2_PKT_TYPE_0RTT_V2:
return NGTCP2_PKT_0RTT;
case NGTCP2_PKT_TYPE_HANDSHAKE_V2:
return NGTCP2_PKT_HANDSHAKE;
case NGTCP2_PKT_TYPE_RETRY_V2:
return NGTCP2_PKT_RETRY;
default:
return 0;
}
default:
if (!ngtcp2_is_supported_version(version)) {
return 0;
}
switch (pkt_type) {
case NGTCP2_PKT_TYPE_INITIAL_V1:
return NGTCP2_PKT_INITIAL;
case NGTCP2_PKT_TYPE_0RTT_V1:
return NGTCP2_PKT_0RTT;
case NGTCP2_PKT_TYPE_HANDSHAKE_V1:
return NGTCP2_PKT_HANDSHAKE;
case NGTCP2_PKT_TYPE_RETRY_V1:
return NGTCP2_PKT_RETRY;
default:
return 0;
}
}
}
uint8_t ngtcp2_pkt_versioned_type(uint32_t version, uint32_t pkt_type) {
switch (version) {
case NGTCP2_PROTO_VER_V2:
switch (pkt_type) {
case NGTCP2_PKT_INITIAL:
return NGTCP2_PKT_TYPE_INITIAL_V2;
case NGTCP2_PKT_0RTT:
return NGTCP2_PKT_TYPE_0RTT_V2;
case NGTCP2_PKT_HANDSHAKE:
return NGTCP2_PKT_TYPE_HANDSHAKE_V2;
case NGTCP2_PKT_RETRY:
return NGTCP2_PKT_TYPE_RETRY_V2;
default:
ngtcp2_unreachable();
}
default:
/* Assume that unsupported versions share the numeric long packet
types with QUIC v1 in order to send a packet to elicit Version
Negotiation packet. */
switch (pkt_type) {
case NGTCP2_PKT_INITIAL:
return NGTCP2_PKT_TYPE_INITIAL_V1;
case NGTCP2_PKT_0RTT:
return NGTCP2_PKT_TYPE_0RTT_V1;
case NGTCP2_PKT_HANDSHAKE:
return NGTCP2_PKT_TYPE_HANDSHAKE_V1;
case NGTCP2_PKT_RETRY:
return NGTCP2_PKT_TYPE_RETRY_V1;
default:
ngtcp2_unreachable();
}
}
}
int ngtcp2_pkt_verify_reserved_bits(uint8_t c) {
if (c & NGTCP2_HEADER_FORM_BIT) {
return (c & NGTCP2_LONG_RESERVED_BIT_MASK) == 0 ? 0 : NGTCP2_ERR_PROTO;
}
return (c & NGTCP2_SHORT_RESERVED_BIT_MASK) == 0 ? 0 : NGTCP2_ERR_PROTO;
}
Zerion Mini Shell 1.0