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openssl/ssl/quic/quic_rx_depack.c
Hugo Landau c93f766860 QUIC RXDP: Strictly enforce ACK PNs with regard to TX key epochs 
Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/21029)
2023-06-16 09:26:28 +10:00

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/*
* Copyright 2022 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include "internal/packet_quic.h"
#include "internal/nelem.h"
#include "internal/quic_wire.h"
#include "internal/quic_record_rx.h"
#include "internal/quic_ackm.h"
#include "internal/quic_rx_depack.h"
#include "internal/quic_error.h"
#include "internal/quic_fc.h"
#include "internal/quic_channel.h"
#include "internal/sockets.h"
#include "quic_local.h"
#include "quic_channel_local.h"
#include "../ssl_local.h"
/*
* Helper functions to process different frame types.
*
* Typically, those that are ACK eliciting will take an OSSL_ACKM_RX_PKT
* pointer argument, the few that aren't ACK eliciting will not. This makes
* them a verifiable pattern against tables where this is specified.
*/
static int depack_do_implicit_stream_create(QUIC_CHANNEL *ch,
uint64_t stream_id,
uint64_t frame_type,
QUIC_STREAM **result);
static int depack_do_frame_padding(PACKET *pkt)
{
/* We ignore this frame */
ossl_quic_wire_decode_padding(pkt);
return 1;
}
static int depack_do_frame_ping(PACKET *pkt, QUIC_CHANNEL *ch,
OSSL_ACKM_RX_PKT *ackm_data)
{
/* We ignore this frame, apart from eliciting an ACK */
if (!ossl_quic_wire_decode_frame_ping(pkt)) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_FRAME_ENCODING_ERROR,
OSSL_QUIC_FRAME_TYPE_PING,
"decode error");
return 0;
}
/* This frame makes the packet ACK eliciting */
ackm_data->is_ack_eliciting = 1;
return 1;
}
static int depack_do_frame_ack(PACKET *pkt, QUIC_CHANNEL *ch,
int packet_space, OSSL_TIME received,
uint64_t frame_type,
OSSL_QRX_PKT *qpacket)
{
OSSL_QUIC_FRAME_ACK ack;
OSSL_QUIC_ACK_RANGE *ack_ranges = NULL;
uint64_t total_ranges = 0;
uint32_t ack_delay_exp = ch->rx_ack_delay_exp;
if (!ossl_quic_wire_peek_frame_ack_num_ranges(pkt, &total_ranges)
/* In case sizeof(uint64_t) > sizeof(size_t) */
|| total_ranges > SIZE_MAX / sizeof(ack_ranges[0])
|| (ack_ranges = OPENSSL_zalloc(sizeof(ack_ranges[0])
* (size_t)total_ranges)) == NULL)
goto malformed;
ack.ack_ranges = ack_ranges;
ack.num_ack_ranges = (size_t)total_ranges;
if (!ossl_quic_wire_decode_frame_ack(pkt, ack_delay_exp, &ack, NULL))
goto malformed;
if (qpacket->hdr->type == QUIC_PKT_TYPE_1RTT
&& (qpacket->key_epoch < ossl_qrx_get_key_epoch(ch->qrx)
|| ch->rxku_expected)
&& ack.ack_ranges[0].end >= ch->txku_pn) {
/*
* RFC 9001 s. 6.2: An endpoint that receives an acknowledgment that is
* carried in a packet protected with old keys where any acknowledged
* packet was protected with newer keys MAY treat that as a connection
* error of type KEY_UPDATE_ERROR.
*
* Two cases to handle here:
*
* - We did spontaneous TXKU, the peer has responded in kind and we
* have detected RXKU; !ch->rxku_expected, but then it sent a packet
* with old keys acknowledging a packet in the new key epoch.
*
* This also covers the case where we got RXKU and triggered
* solicited TXKU, and then for some reason the peer sent an ACK of
* a PN in our new TX key epoch with old keys.
*
* - We did spontaneous TXKU; ch->txku_pn is the starting PN of our
* new TX key epoch; the peer has not initiated a solicited TXKU in
* response (so we have not detected RXKU); in this case the RX key
* epoch has not incremented and ch->rxku_expected is still 1.
*/
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_KEY_UPDATE_ERROR,
frame_type,
"acked packet which initiated a "
"key update without a "
"corresponding key update");
return 0;
}
if (!ossl_ackm_on_rx_ack_frame(ch->ackm, &ack,
packet_space, received))
goto malformed;
OPENSSL_free(ack_ranges);
return 1;
malformed:
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_FRAME_ENCODING_ERROR,
frame_type,
"decode error");
OPENSSL_free(ack_ranges);
return 0;
}
static int depack_do_frame_reset_stream(PACKET *pkt,
QUIC_CHANNEL *ch,
OSSL_ACKM_RX_PKT *ackm_data)
{
OSSL_QUIC_FRAME_RESET_STREAM frame_data;
QUIC_STREAM *stream = NULL;
if (!ossl_quic_wire_decode_frame_reset_stream(pkt, &frame_data)) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_FRAME_ENCODING_ERROR,
OSSL_QUIC_FRAME_TYPE_RESET_STREAM,
"decode error");
return 0;
}
/* This frame makes the packet ACK eliciting */
ackm_data->is_ack_eliciting = 1;
if (!depack_do_implicit_stream_create(ch, frame_data.stream_id,
OSSL_QUIC_FRAME_TYPE_RESET_STREAM,
&stream))
return 0; /* error already raised for us */
if (stream == NULL)
return 1; /* old deleted stream, not a protocol violation, ignore */
if (stream->rstream == NULL) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_STREAM_STATE_ERROR,
OSSL_QUIC_FRAME_TYPE_RESET_STREAM,
"RESET_STREAM frame for "
"TX only stream");
return 0;
}
stream->peer_reset_stream = 1;
stream->peer_reset_stream_aec = frame_data.app_error_code;
ossl_quic_stream_map_update_state(&ch->qsm, stream);
return 1;
}
static int depack_do_frame_stop_sending(PACKET *pkt,
QUIC_CHANNEL *ch,
OSSL_ACKM_RX_PKT *ackm_data)
{
OSSL_QUIC_FRAME_STOP_SENDING frame_data;
QUIC_STREAM *stream = NULL;
if (!ossl_quic_wire_decode_frame_stop_sending(pkt, &frame_data)) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_FRAME_ENCODING_ERROR,
OSSL_QUIC_FRAME_TYPE_STOP_SENDING,
"decode error");
return 0;
}
/* This frame makes the packet ACK eliciting */
ackm_data->is_ack_eliciting = 1;
if (!depack_do_implicit_stream_create(ch, frame_data.stream_id,
OSSL_QUIC_FRAME_TYPE_STOP_SENDING,
&stream))
return 0; /* error already raised for us */
if (stream == NULL)
return 1; /* old deleted stream, not a protocol violation, ignore */
if (stream->sstream == NULL) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_STREAM_STATE_ERROR,
OSSL_QUIC_FRAME_TYPE_STOP_SENDING,
"STOP_SENDING frame for "
"RX only stream");
return 0;
}
stream->peer_stop_sending = 1;
stream->peer_stop_sending_aec = frame_data.app_error_code;
/*
* RFC 9000 s. 3.5: Receiving a STOP_SENDING frame means we must respond in
* turn with a RESET_STREAM frame for the same part of the stream. The other
* part is unaffected.
*/
ossl_quic_stream_map_reset_stream_send_part(&ch->qsm, stream,
frame_data.app_error_code);
return 1;
}
static int depack_do_frame_crypto(PACKET *pkt, QUIC_CHANNEL *ch,
OSSL_QRX_PKT *parent_pkt,
OSSL_ACKM_RX_PKT *ackm_data,
uint64_t *datalen)
{
OSSL_QUIC_FRAME_CRYPTO f;
QUIC_RSTREAM *rstream;
*datalen = 0;
if (!ossl_quic_wire_decode_frame_crypto(pkt, 0, &f)) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_FRAME_ENCODING_ERROR,
OSSL_QUIC_FRAME_TYPE_CRYPTO,
"decode error");
return 0;
}
/* This frame makes the packet ACK eliciting */
ackm_data->is_ack_eliciting = 1;
rstream = ch->crypto_recv[ackm_data->pkt_space];
if (!ossl_assert(rstream != NULL))
/*
* This should not happen; we should only have a NULL stream here if
* the EL has been discarded, and if the EL has been discarded we
* shouldn't be here.
*/
return 0;
if (!ossl_quic_rstream_queue_data(rstream, parent_pkt,
f.offset, f.data, f.len, 0))
return 0;
*datalen = f.len;
return 1;
}
static int depack_do_frame_new_token(PACKET *pkt, QUIC_CHANNEL *ch,
OSSL_ACKM_RX_PKT *ackm_data)
{
const uint8_t *token;
size_t token_len;
if (!ossl_quic_wire_decode_frame_new_token(pkt, &token, &token_len)) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_FRAME_ENCODING_ERROR,
OSSL_QUIC_FRAME_TYPE_NEW_TOKEN,
"decode error");
return 0;
}
/* This frame makes the packet ACK eliciting */
ackm_data->is_ack_eliciting = 1;
/* TODO(QUIC): ADD CODE to send |token| to the session manager */
return 1;
}
/*
* Returns 1 if no protocol violation has occurred. In this case *result will be
* non-NULL unless this is an old deleted stream and we should ignore the frame
* causing this function to be called. Returns 0 on protocol violation.
*/
static int depack_do_implicit_stream_create(QUIC_CHANNEL *ch,
uint64_t stream_id,
uint64_t frame_type,
QUIC_STREAM **result)
{
QUIC_STREAM *stream;
uint64_t peer_role, stream_ordinal;
uint64_t *p_next_ordinal_local, *p_next_ordinal_remote;
QUIC_RXFC *max_streams_fc;
int is_uni, is_remote_init;
stream = ossl_quic_stream_map_get_by_id(&ch->qsm, stream_id);
if (stream != NULL) {
*result = stream;
return 1;
}
/*
* If we do not yet have a stream with the given ID, there are three
* possibilities:
*
* (a) The stream ID is for a remotely-created stream and the peer
* is creating a stream.
*
* (b) The stream ID is for a locally-created stream which has
* previously been deleted.
*
* (c) The stream ID is for a locally-created stream which does
* not exist yet. This is a protocol violation and we must
* terminate the connection in this case.
*
* We distinguish between (b) and (c) using the stream ID allocator
* variable. Since stream ordinals are allocated monotonically, we
* simply determine if the stream ordinal is in the future.
*/
peer_role = ch->is_server
? QUIC_STREAM_INITIATOR_CLIENT
: QUIC_STREAM_INITIATOR_SERVER;
is_remote_init = ((stream_id & QUIC_STREAM_INITIATOR_MASK) == peer_role);
is_uni = ((stream_id & QUIC_STREAM_DIR_MASK) == QUIC_STREAM_DIR_UNI);
stream_ordinal = stream_id >> 2;
if (is_remote_init) {
/*
* Peer-created stream which does not yet exist. Create it. QUIC stream
* ordinals within a given stream type MUST be used in sequence and
* receiving a STREAM frame for ordinal n must implicitly create streams
* with ordinals [0, n) within that stream type even if no explicit
* STREAM frames are received for those ordinals.
*/
p_next_ordinal_remote = is_uni
? &ch->next_remote_stream_ordinal_uni
: &ch->next_remote_stream_ordinal_bidi;
/* Check this isn't violating stream count flow control. */
max_streams_fc = is_uni
? &ch->max_streams_uni_rxfc
: &ch->max_streams_bidi_rxfc;
if (!ossl_quic_rxfc_on_rx_stream_frame(max_streams_fc,
stream_ordinal + 1,
/*is_fin=*/0)) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_INTERNAL_ERROR,
frame_type,
"internal error (stream count RXFC)");
return 0;
}
if (ossl_quic_rxfc_get_error(max_streams_fc, 0) != QUIC_ERR_NO_ERROR) {
ossl_quic_channel_raise_protocol_error(ch, QUIC_ERR_STREAM_LIMIT_ERROR,
frame_type,
"exceeded maximum allowed streams");
return 0;
}
/*
* Create the named stream and any streams coming before it yet to be
* created.
*/
while (*p_next_ordinal_remote <= stream_ordinal) {
uint64_t cur_stream_id = (*p_next_ordinal_remote << 2) |
(stream_id
& (QUIC_STREAM_DIR_MASK | QUIC_STREAM_INITIATOR_MASK));
stream = ossl_quic_channel_new_stream_remote(ch, cur_stream_id);
if (stream == NULL) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_INTERNAL_ERROR,
frame_type,
"internal error (stream allocation)");
return 0;
}
++*p_next_ordinal_remote;
}
*result = stream;
} else {
/* Locally-created stream which does not yet exist. */
p_next_ordinal_local = is_uni
? &ch->next_local_stream_ordinal_uni
: &ch->next_local_stream_ordinal_bidi;
if (stream_ordinal >= *p_next_ordinal_local) {
/*
* We never created this stream yet, this is a protocol
* violation.
*/
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_STREAM_STATE_ERROR,
frame_type,
"STREAM frame for nonexistent "
"stream");
return 0;
}
/*
* Otherwise this is for an old locally-initiated stream which we
* have subsequently deleted. Ignore the data; it may simply be a
* retransmission. We already take care of notifying the peer of the
* termination of the stream during the stream deletion lifecycle.
*/
*result = NULL;
}
return 1;
}
static int depack_do_frame_stream(PACKET *pkt, QUIC_CHANNEL *ch,
OSSL_QRX_PKT *parent_pkt,
OSSL_ACKM_RX_PKT *ackm_data,
uint64_t frame_type,
uint64_t *datalen)
{
OSSL_QUIC_FRAME_STREAM frame_data;
QUIC_STREAM *stream;
uint64_t fce;
*datalen = 0;
if (!ossl_quic_wire_decode_frame_stream(pkt, 0, &frame_data)) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_FRAME_ENCODING_ERROR,
frame_type,
"decode error");
return 0;
}
/* This frame makes the packet ACK eliciting */
ackm_data->is_ack_eliciting = 1;
if (!depack_do_implicit_stream_create(ch, frame_data.stream_id,
frame_type, &stream))
return 0; /* protocol error raised by above call */
if (stream == NULL)
/*
* Data for old stream which is not a protocol violation but should be
* ignored, so stop here.
*/
return 1;
if (stream->rstream == NULL) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_STREAM_STATE_ERROR,
frame_type,
"STREAM frame for TX only "
"stream");
return 0;
}
/* Notify stream flow controller. */
if (!ossl_quic_rxfc_on_rx_stream_frame(&stream->rxfc,
frame_data.offset + frame_data.len,
frame_data.is_fin)) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_INTERNAL_ERROR,
frame_type,
"internal error (flow control)");
return 0;
}
/* Has a flow control error occurred? */
fce = ossl_quic_rxfc_get_error(&stream->rxfc, 0);
if (fce != QUIC_ERR_NO_ERROR) {
ossl_quic_channel_raise_protocol_error(ch,
fce,
frame_type,
"flow control violation");
return 0;
}
/*
* The receive stream buffer may or may not choose to consume the data
* without copying by reffing the OSSL_QRX_PKT. In this case
* ossl_qrx_pkt_release() will be eventually called when the data is no
* longer needed.
*/
if (!ossl_quic_rstream_queue_data(stream->rstream, parent_pkt,
frame_data.offset,
frame_data.data,
frame_data.len,
frame_data.is_fin))
return 0;
*datalen = frame_data.len;
return 1;
}
static void update_streams(QUIC_STREAM *s, void *arg)
{
QUIC_CHANNEL *ch = arg;
ossl_quic_stream_map_update_state(&ch->qsm, s);
}
static void update_streams_bidi(QUIC_STREAM *s, void *arg)
{
QUIC_CHANNEL *ch = arg;
if (!ossl_quic_stream_is_bidi(s))
return;
ossl_quic_stream_map_update_state(&ch->qsm, s);
}
static void update_streams_uni(QUIC_STREAM *s, void *arg)
{
QUIC_CHANNEL *ch = arg;
if (ossl_quic_stream_is_bidi(s))
return;
ossl_quic_stream_map_update_state(&ch->qsm, s);
}
static int depack_do_frame_max_data(PACKET *pkt, QUIC_CHANNEL *ch,
OSSL_ACKM_RX_PKT *ackm_data)
{
uint64_t max_data = 0;
if (!ossl_quic_wire_decode_frame_max_data(pkt, &max_data)) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_FRAME_ENCODING_ERROR,
OSSL_QUIC_FRAME_TYPE_MAX_DATA,
"decode error");
return 0;
}
/* This frame makes the packet ACK eliciting */
ackm_data->is_ack_eliciting = 1;
ossl_quic_txfc_bump_cwm(&ch->conn_txfc, max_data);
ossl_quic_stream_map_visit(&ch->qsm, update_streams, ch);
return 1;
}
static int depack_do_frame_max_stream_data(PACKET *pkt,
QUIC_CHANNEL *ch,
OSSL_ACKM_RX_PKT *ackm_data)
{
uint64_t stream_id = 0;
uint64_t max_stream_data = 0;
QUIC_STREAM *stream;
if (!ossl_quic_wire_decode_frame_max_stream_data(pkt, &stream_id,
&max_stream_data)) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_FRAME_ENCODING_ERROR,
OSSL_QUIC_FRAME_TYPE_MAX_STREAM_DATA,
"decode error");
return 0;
}
/* This frame makes the packet ACK eliciting */
ackm_data->is_ack_eliciting = 1;
if (!depack_do_implicit_stream_create(ch, stream_id,
OSSL_QUIC_FRAME_TYPE_MAX_STREAM_DATA,
&stream))
return 0; /* error already raised for us */
if (stream == NULL)
return 1; /* old deleted stream, not a protocol violation, ignore */
if (stream->sstream == NULL) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_STREAM_STATE_ERROR,
OSSL_QUIC_FRAME_TYPE_MAX_STREAM_DATA,
"MAX_STREAM_DATA for TX only "
"stream");
return 0;
}
ossl_quic_txfc_bump_cwm(&stream->txfc, max_stream_data);
ossl_quic_stream_map_update_state(&ch->qsm, stream);
return 1;
}
static int depack_do_frame_max_streams(PACKET *pkt,
QUIC_CHANNEL *ch,
OSSL_ACKM_RX_PKT *ackm_data,
uint64_t frame_type)
{
uint64_t max_streams = 0;
if (!ossl_quic_wire_decode_frame_max_streams(pkt, &max_streams)) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_FRAME_ENCODING_ERROR,
frame_type,
"decode error");
return 0;
}
/* This frame makes the packet ACK eliciting */
ackm_data->is_ack_eliciting = 1;
if (max_streams > (((uint64_t)1) << 60)) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_FRAME_ENCODING_ERROR,
frame_type,
"invalid max streams value");
return 0;
}
switch (frame_type) {
case OSSL_QUIC_FRAME_TYPE_MAX_STREAMS_BIDI:
if (max_streams > ch->max_local_streams_bidi)
ch->max_local_streams_bidi = max_streams;
/* Some streams may now be able to send. */
ossl_quic_stream_map_visit(&ch->qsm, update_streams_bidi, ch);
break;
case OSSL_QUIC_FRAME_TYPE_MAX_STREAMS_UNI:
if (max_streams > ch->max_local_streams_uni)
ch->max_local_streams_uni = max_streams;
/* Some streams may now be able to send. */
ossl_quic_stream_map_visit(&ch->qsm, update_streams_uni, ch);
break;
default:
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_FRAME_ENCODING_ERROR,
frame_type,
"decode error");
return 0;
}
return 1;
}
static int depack_do_frame_data_blocked(PACKET *pkt,
QUIC_CHANNEL *ch,
OSSL_ACKM_RX_PKT *ackm_data)
{
uint64_t max_data = 0;
if (!ossl_quic_wire_decode_frame_data_blocked(pkt, &max_data)) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_FRAME_ENCODING_ERROR,
OSSL_QUIC_FRAME_TYPE_DATA_BLOCKED,
"decode error");
return 0;
}
/* This frame makes the packet ACK eliciting */
ackm_data->is_ack_eliciting = 1;
/* No-op - informative/debugging frame. */
return 1;
}
static int depack_do_frame_stream_data_blocked(PACKET *pkt,
QUIC_CHANNEL *ch,
OSSL_ACKM_RX_PKT *ackm_data)
{
uint64_t stream_id = 0;
uint64_t max_data = 0;
QUIC_STREAM *stream;
if (!ossl_quic_wire_decode_frame_stream_data_blocked(pkt, &stream_id,
&max_data)) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_FRAME_ENCODING_ERROR,
OSSL_QUIC_FRAME_TYPE_STREAM_DATA_BLOCKED,
"decode error");
return 0;
}
/* This frame makes the packet ACK eliciting */
ackm_data->is_ack_eliciting = 1;
/*
* This is an informative/debugging frame, so we don't have to do anything,
* but it does trigger stream creation.
*/
if (!depack_do_implicit_stream_create(ch, stream_id,
OSSL_QUIC_FRAME_TYPE_STREAM_DATA_BLOCKED,
&stream))
return 0; /* error already raised for us */
/* No-op - informative/debugging frame. */
return 1;
}
static int depack_do_frame_streams_blocked(PACKET *pkt,
QUIC_CHANNEL *ch,
OSSL_ACKM_RX_PKT *ackm_data,
uint64_t frame_type)
{
uint64_t max_data = 0;
if (!ossl_quic_wire_decode_frame_streams_blocked(pkt, &max_data)) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_FRAME_ENCODING_ERROR,
frame_type,
"decode error");
return 0;
}
/* This frame makes the packet ACK eliciting */
ackm_data->is_ack_eliciting = 1;
/* No-op - informative/debugging frame. */
return 1;
}
static int depack_do_frame_new_conn_id(PACKET *pkt,
QUIC_CHANNEL *ch,
OSSL_ACKM_RX_PKT *ackm_data)
{
OSSL_QUIC_FRAME_NEW_CONN_ID frame_data;
if (!ossl_quic_wire_decode_frame_new_conn_id(pkt, &frame_data)) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_FRAME_ENCODING_ERROR,
OSSL_QUIC_FRAME_TYPE_NEW_CONN_ID,
"decode error");
return 0;
}
/* This frame makes the packet ACK eliciting */
ackm_data->is_ack_eliciting = 1;
ossl_quic_channel_on_new_conn_id(ch, &frame_data);
return 1;
}
static int depack_do_frame_retire_conn_id(PACKET *pkt,
QUIC_CHANNEL *ch,
OSSL_ACKM_RX_PKT *ackm_data)
{
uint64_t seq_num;
if (!ossl_quic_wire_decode_frame_retire_conn_id(pkt, &seq_num)) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_FRAME_ENCODING_ERROR,
OSSL_QUIC_FRAME_TYPE_RETIRE_CONN_ID,
"decode error");
return 0;
}
/* This frame makes the packet ACK eliciting */
ackm_data->is_ack_eliciting = 1;
/* TODO(QUIC): Post MVP ADD CODE to send |seq_num| to the ch manager */
return 1;
}
static int depack_do_frame_path_challenge(PACKET *pkt,
QUIC_CHANNEL *ch,
OSSL_ACKM_RX_PKT *ackm_data)
{
uint64_t frame_data = 0;
if (!ossl_quic_wire_decode_frame_path_challenge(pkt, &frame_data)) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_FRAME_ENCODING_ERROR,
OSSL_QUIC_FRAME_TYPE_PATH_CHALLENGE,
"decode error");
return 0;
}
/* This frame makes the packet ACK eliciting */
ackm_data->is_ack_eliciting = 1;
/* TODO(QUIC): ADD CODE to send |frame_data| to the ch manager */
return 1;
}
static int depack_do_frame_path_response(PACKET *pkt,
QUIC_CHANNEL *ch,
OSSL_ACKM_RX_PKT *ackm_data)
{
uint64_t frame_data = 0;
if (!ossl_quic_wire_decode_frame_path_response(pkt, &frame_data)) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_FRAME_ENCODING_ERROR,
OSSL_QUIC_FRAME_TYPE_PATH_RESPONSE,
"decode error");
return 0;
}
/* This frame makes the packet ACK eliciting */
ackm_data->is_ack_eliciting = 1;
/* TODO(QUIC): ADD CODE to send |frame_data| to the ch manager */
return 1;
}
static int depack_do_frame_conn_close(PACKET *pkt, QUIC_CHANNEL *ch)
{
OSSL_QUIC_FRAME_CONN_CLOSE frame_data;
if (!ossl_quic_wire_decode_frame_conn_close(pkt, &frame_data))
return 0;
ossl_quic_channel_on_remote_conn_close(ch, &frame_data);
return 1;
}
static int depack_do_frame_handshake_done(PACKET *pkt,
QUIC_CHANNEL *ch,
OSSL_ACKM_RX_PKT *ackm_data)
{
if (!ossl_quic_wire_decode_frame_handshake_done(pkt))
return 0;
/* This frame makes the packet ACK eliciting */
ackm_data->is_ack_eliciting = 1;
ossl_quic_channel_on_handshake_confirmed(ch);
return 1;
}
/* Main frame processor */
static int depack_process_frames(QUIC_CHANNEL *ch, PACKET *pkt,
OSSL_QRX_PKT *parent_pkt, int packet_space,
OSSL_TIME received, OSSL_ACKM_RX_PKT *ackm_data)
{
uint32_t pkt_type = parent_pkt->hdr->type;
while (PACKET_remaining(pkt) > 0) {
uint64_t frame_type;
const unsigned char *sof = NULL;
uint64_t datalen = 0;
if (ch->msg_callback != NULL)
sof = PACKET_data(pkt);
if (!ossl_quic_wire_peek_frame_header(pkt, &frame_type))
return 0;
switch (frame_type) {
case OSSL_QUIC_FRAME_TYPE_PING:
/* Allowed in all packet types */
if (!depack_do_frame_ping(pkt, ch, ackm_data))
return 0;
break;
case OSSL_QUIC_FRAME_TYPE_PADDING:
/* Allowed in all packet types */
if (!depack_do_frame_padding(pkt))
return 0;
break;
case OSSL_QUIC_FRAME_TYPE_ACK_WITHOUT_ECN:
case OSSL_QUIC_FRAME_TYPE_ACK_WITH_ECN:
/* ACK frames are valid everywhere except in 0RTT packets */
if (pkt_type == QUIC_PKT_TYPE_0RTT) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_PROTOCOL_VIOLATION,
frame_type,
"ACK not valid in 0-RTT");
return 0;
}
if (!depack_do_frame_ack(pkt, ch, packet_space, received,
frame_type, parent_pkt))
return 0;
break;
case OSSL_QUIC_FRAME_TYPE_RESET_STREAM:
/* RESET_STREAM frames are valid in 0RTT and 1RTT packets */
if (pkt_type != QUIC_PKT_TYPE_0RTT
&& pkt_type != QUIC_PKT_TYPE_1RTT) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_PROTOCOL_VIOLATION,
frame_type,
"RESET_STREAM not valid in "
"INITIAL/HANDSHAKE");
return 0;
}
if (!depack_do_frame_reset_stream(pkt, ch, ackm_data))
return 0;
break;
case OSSL_QUIC_FRAME_TYPE_STOP_SENDING:
/* STOP_SENDING frames are valid in 0RTT and 1RTT packets */
if (pkt_type != QUIC_PKT_TYPE_0RTT
&& pkt_type != QUIC_PKT_TYPE_1RTT) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_PROTOCOL_VIOLATION,
frame_type,
"STOP_SENDING not valid in "
"INITIAL/HANDSHAKE");
return 0;
}
if (!depack_do_frame_stop_sending(pkt, ch, ackm_data))
return 0;
break;
case OSSL_QUIC_FRAME_TYPE_CRYPTO:
/* CRYPTO frames are valid everywhere except in 0RTT packets */
if (pkt_type == QUIC_PKT_TYPE_0RTT) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_PROTOCOL_VIOLATION,
frame_type,
"CRYPTO frame not valid in 0-RTT");
return 0;
}
if (!depack_do_frame_crypto(pkt, ch, parent_pkt, ackm_data, &datalen))
return 0;
break;
case OSSL_QUIC_FRAME_TYPE_NEW_TOKEN:
/* NEW_TOKEN frames are valid in 1RTT packets */
if (pkt_type != QUIC_PKT_TYPE_1RTT) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_PROTOCOL_VIOLATION,
frame_type,
"NEW_TOKEN valid only in 1-RTT");
return 0;
}
if (!depack_do_frame_new_token(pkt, ch, ackm_data))
return 0;
break;
case OSSL_QUIC_FRAME_TYPE_STREAM:
case OSSL_QUIC_FRAME_TYPE_STREAM_FIN:
case OSSL_QUIC_FRAME_TYPE_STREAM_LEN:
case OSSL_QUIC_FRAME_TYPE_STREAM_LEN_FIN:
case OSSL_QUIC_FRAME_TYPE_STREAM_OFF:
case OSSL_QUIC_FRAME_TYPE_STREAM_OFF_FIN:
case OSSL_QUIC_FRAME_TYPE_STREAM_OFF_LEN:
case OSSL_QUIC_FRAME_TYPE_STREAM_OFF_LEN_FIN:
/* STREAM frames are valid in 0RTT and 1RTT packets */
if (pkt_type != QUIC_PKT_TYPE_0RTT
&& pkt_type != QUIC_PKT_TYPE_1RTT) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_PROTOCOL_VIOLATION,
frame_type,
"STREAM valid only in 0/1-RTT");
return 0;
}
if (!depack_do_frame_stream(pkt, ch, parent_pkt, ackm_data,
frame_type, &datalen))
return 0;
break;
case OSSL_QUIC_FRAME_TYPE_MAX_DATA:
/* MAX_DATA frames are valid in 0RTT and 1RTT packets */
if (pkt_type != QUIC_PKT_TYPE_0RTT
&& pkt_type != QUIC_PKT_TYPE_1RTT) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_PROTOCOL_VIOLATION,
frame_type,
"MAX_DATA valid only in 0/1-RTT");
return 0;
}
if (!depack_do_frame_max_data(pkt, ch, ackm_data))
return 0;
break;
case OSSL_QUIC_FRAME_TYPE_MAX_STREAM_DATA:
/* MAX_STREAM_DATA frames are valid in 0RTT and 1RTT packets */
if (pkt_type != QUIC_PKT_TYPE_0RTT
&& pkt_type != QUIC_PKT_TYPE_1RTT) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_PROTOCOL_VIOLATION,
frame_type,
"MAX_STREAM_DATA valid only in 0/1-RTT");
return 0;
}
if (!depack_do_frame_max_stream_data(pkt, ch, ackm_data))
return 0;
break;
case OSSL_QUIC_FRAME_TYPE_MAX_STREAMS_BIDI:
case OSSL_QUIC_FRAME_TYPE_MAX_STREAMS_UNI:
/* MAX_STREAMS frames are valid in 0RTT and 1RTT packets */
if (pkt_type != QUIC_PKT_TYPE_0RTT
&& pkt_type != QUIC_PKT_TYPE_1RTT) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_PROTOCOL_VIOLATION,
frame_type,
"MAX_STREAMS valid only in 0/1-RTT");
return 0;
}
if (!depack_do_frame_max_streams(pkt, ch, ackm_data,
frame_type))
return 0;
break;
case OSSL_QUIC_FRAME_TYPE_DATA_BLOCKED:
/* DATA_BLOCKED frames are valid in 0RTT and 1RTT packets */
if (pkt_type != QUIC_PKT_TYPE_0RTT
&& pkt_type != QUIC_PKT_TYPE_1RTT) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_PROTOCOL_VIOLATION,
frame_type,
"DATA_BLOCKED valid only in 0/1-RTT");
return 0;
}
if (!depack_do_frame_data_blocked(pkt, ch, ackm_data))
return 0;
break;
case OSSL_QUIC_FRAME_TYPE_STREAM_DATA_BLOCKED:
/* STREAM_DATA_BLOCKED frames are valid in 0RTT and 1RTT packets */
if (pkt_type != QUIC_PKT_TYPE_0RTT
&& pkt_type != QUIC_PKT_TYPE_1RTT) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_PROTOCOL_VIOLATION,
frame_type,
"STREAM_DATA_BLOCKED valid only in 0/1-RTT");
return 0;
}
if (!depack_do_frame_stream_data_blocked(pkt, ch, ackm_data))
return 0;
break;
case OSSL_QUIC_FRAME_TYPE_STREAMS_BLOCKED_BIDI:
case OSSL_QUIC_FRAME_TYPE_STREAMS_BLOCKED_UNI:
/* STREAMS_BLOCKED frames are valid in 0RTT and 1RTT packets */
if (pkt_type != QUIC_PKT_TYPE_0RTT
&& pkt_type != QUIC_PKT_TYPE_1RTT) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_PROTOCOL_VIOLATION,
frame_type,
"STREAMS valid only in 0/1-RTT");
return 0;
}
if (!depack_do_frame_streams_blocked(pkt, ch, ackm_data,
frame_type))
return 0;
break;
case OSSL_QUIC_FRAME_TYPE_NEW_CONN_ID:
/* NEW_CONN_ID frames are valid in 0RTT and 1RTT packets */
if (pkt_type != QUIC_PKT_TYPE_0RTT
&& pkt_type != QUIC_PKT_TYPE_1RTT) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_PROTOCOL_VIOLATION,
frame_type,
"NEW_CONN_ID valid only in 0/1-RTT");
}
if (!depack_do_frame_new_conn_id(pkt, ch, ackm_data))
return 0;
break;
case OSSL_QUIC_FRAME_TYPE_RETIRE_CONN_ID:
/* RETIRE_CONN_ID frames are valid in 0RTT and 1RTT packets */
if (pkt_type != QUIC_PKT_TYPE_0RTT
&& pkt_type != QUIC_PKT_TYPE_1RTT) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_PROTOCOL_VIOLATION,
frame_type,
"RETIRE_CONN_ID valid only in 0/1-RTT");
return 0;
}
if (!depack_do_frame_retire_conn_id(pkt, ch, ackm_data))
return 0;
break;
case OSSL_QUIC_FRAME_TYPE_PATH_CHALLENGE:
/* PATH_CHALLENGE frames are valid in 0RTT and 1RTT packets */
if (pkt_type != QUIC_PKT_TYPE_0RTT
&& pkt_type != QUIC_PKT_TYPE_1RTT) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_PROTOCOL_VIOLATION,
frame_type,
"PATH_CHALLENGE valid only in 0/1-RTT");
return 0;
}
if (!depack_do_frame_path_challenge(pkt, ch, ackm_data))
return 0;
break;
case OSSL_QUIC_FRAME_TYPE_PATH_RESPONSE:
/* PATH_RESPONSE frames are valid in 1RTT packets */
if (pkt_type != QUIC_PKT_TYPE_1RTT) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_PROTOCOL_VIOLATION,
frame_type,
"PATH_CHALLENGE valid only in 1-RTT");
return 0;
}
if (!depack_do_frame_path_response(pkt, ch, ackm_data))
return 0;
break;
case OSSL_QUIC_FRAME_TYPE_CONN_CLOSE_APP:
/* CONN_CLOSE_APP frames are valid in 0RTT and 1RTT packets */
if (pkt_type != QUIC_PKT_TYPE_0RTT
&& pkt_type != QUIC_PKT_TYPE_1RTT) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_PROTOCOL_VIOLATION,
frame_type,
"CONN_CLOSE (APP) valid only in 0/1-RTT");
return 0;
}
/* FALLTHRU */
case OSSL_QUIC_FRAME_TYPE_CONN_CLOSE_TRANSPORT:
/* CONN_CLOSE_TRANSPORT frames are valid in all packets */
if (!depack_do_frame_conn_close(pkt, ch))
return 0;
break;
case OSSL_QUIC_FRAME_TYPE_HANDSHAKE_DONE:
/* HANDSHAKE_DONE frames are valid in 1RTT packets */
if (pkt_type != QUIC_PKT_TYPE_1RTT) {
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_PROTOCOL_VIOLATION,
frame_type,
"HANDSHAKE_DONE valid only in 1-RTT");
return 0;
}
if (!depack_do_frame_handshake_done(pkt, ch, ackm_data))
return 0;
break;
default:
/* Unknown frame type */
ackm_data->is_ack_eliciting = 1;
ossl_quic_channel_raise_protocol_error(ch,
QUIC_ERR_PROTOCOL_VIOLATION,
frame_type,
"Unknown frame type received");
return 0;
}
if (ch->msg_callback != NULL) {
int ctype = SSL3_RT_QUIC_FRAME_FULL;
size_t framelen = PACKET_data(pkt) - sof;
if (frame_type == OSSL_QUIC_FRAME_TYPE_PADDING) {
ctype = SSL3_RT_QUIC_FRAME_PADDING;
} else if (OSSL_QUIC_FRAME_TYPE_IS_STREAM(frame_type)
|| frame_type == OSSL_QUIC_FRAME_TYPE_CRYPTO) {
ctype = SSL3_RT_QUIC_FRAME_HEADER;
framelen -= (size_t)datalen;
}
ch->msg_callback(0, OSSL_QUIC1_VERSION, ctype, sof, framelen,
ch->msg_callback_ssl, ch->msg_callback_arg);
}
}
return 1;
}
QUIC_NEEDS_LOCK
int ossl_quic_handle_frames(QUIC_CHANNEL *ch, OSSL_QRX_PKT *qpacket)
{
PACKET pkt;
OSSL_ACKM_RX_PKT ackm_data;
/*
* ok has three states:
* -1 error with ackm_data uninitialized
* 0 error with ackm_data initialized
* 1 success (ackm_data initialized)
*/
int ok = -1; /* Assume the worst */
if (ch == NULL)
goto end;
/* Initialize |ackm_data| (and reinitialize |ok|)*/
memset(&ackm_data, 0, sizeof(ackm_data));
/*
* TODO(QUIC): ASSUMPTION: All packets that aren't special case have a
* packet number
*/
ackm_data.pkt_num = qpacket->pn;
ackm_data.time = qpacket->time;
switch (qpacket->hdr->type) {
case QUIC_PKT_TYPE_INITIAL:
ackm_data.pkt_space = QUIC_PN_SPACE_INITIAL;
break;
case QUIC_PKT_TYPE_HANDSHAKE:
ackm_data.pkt_space = QUIC_PN_SPACE_HANDSHAKE;
break;
case QUIC_PKT_TYPE_0RTT:
case QUIC_PKT_TYPE_1RTT:
ackm_data.pkt_space = QUIC_PN_SPACE_APP;
break;
default:
/*
* Retry and Version Negotiation packets should not be passed to this
* function.
*/
goto end;
}
ok = 0; /* Still assume the worst */
/* Now that special cases are out of the way, parse frames */
if (!PACKET_buf_init(&pkt, qpacket->hdr->data, qpacket->hdr->len)
|| !depack_process_frames(ch, &pkt, qpacket,
ackm_data.pkt_space, qpacket->time,
&ackm_data))
goto end;
ok = 1;
end:
/*
* TODO(QUIC): ASSUMPTION: If this function is called at all, |qpacket| is
* a legitimate packet, even if its contents aren't.
* Therefore, we call ossl_ackm_on_rx_packet() unconditionally, as long as
* |ackm_data| has at least been initialized.
*/
if (ok >= 0)
ossl_ackm_on_rx_packet(ch->ackm, &ackm_data);
return ok > 0;
}
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