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litespeed-quic/src/liblsquic/lsquic_parse_common.c

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/* Copyright (c) 2017 - 2020 LiteSpeed Technologies Inc. See LICENSE. */
#include <assert.h>
#include <string.h>
#include <sys/queue.h>
#include <sys/types.h>
#include "lsquic.h"
#include "lsquic_types.h"
#include "lsquic_int_types.h"
#include "lsquic_packet_common.h"
#include "lsquic_packet_in.h"
#include "lsquic_parse_common.h"
#include "lsquic_parse.h"
#include "lsquic_enc_sess.h"
#include "lsquic_version.h"
#include "lsquic_qtags.h"
static int
parse_ietf_v1_or_Q046plus_long_begin (struct lsquic_packet_in *packet_in,
size_t length, int is_server, unsigned cid_len,
struct packin_parse_state *state)
{
lsquic_ver_tag_t tag;
if (length >= 5)
{
memcpy(&tag, packet_in->pi_data + 1, 4);
switch (tag)
{
case TAG('Q', '0', '4', '6'):
return lsquic_Q046_parse_packet_in_long_begin(packet_in, length,
is_server, cid_len, state);
case TAG('Q', '0', '5', '0'):
return lsquic_Q050_parse_packet_in_long_begin(packet_in, length,
is_server, cid_len, state);
default:
return lsquic_ietf_v1_parse_packet_in_long_begin(packet_in, length,
is_server, cid_len, state);
}
}
else
return -1;
}
static int (* const parse_begin_funcs[32]) (struct lsquic_packet_in *,
size_t length, int is_server, unsigned cid_len,
struct packin_parse_state *) =
{
/* Xs vary, Gs are iGnored: */
#define PBEL(mask) [(mask) >> 3]
/* 1X11 XGGG: */
PBEL(0x80|0x40|0x20|0x10|0x08) = lsquic_Q046_parse_packet_in_long_begin,
PBEL(0x80|0x00|0x20|0x10|0x08) = lsquic_Q046_parse_packet_in_long_begin,
PBEL(0x80|0x40|0x20|0x10|0x00) = lsquic_Q046_parse_packet_in_long_begin,
PBEL(0x80|0x00|0x20|0x10|0x00) = lsquic_Q046_parse_packet_in_long_begin,
/* 1X00 XGGG: */
PBEL(0x80|0x40|0x00|0x00|0x08) = parse_ietf_v1_or_Q046plus_long_begin,
PBEL(0x80|0x00|0x00|0x00|0x08) = parse_ietf_v1_or_Q046plus_long_begin,
PBEL(0x80|0x40|0x00|0x00|0x00) = parse_ietf_v1_or_Q046plus_long_begin,
PBEL(0x80|0x00|0x00|0x00|0x00) = parse_ietf_v1_or_Q046plus_long_begin,
/* 1X01 XGGG: */
PBEL(0x80|0x40|0x00|0x10|0x08) = parse_ietf_v1_or_Q046plus_long_begin,
PBEL(0x80|0x00|0x00|0x10|0x08) = parse_ietf_v1_or_Q046plus_long_begin,
PBEL(0x80|0x40|0x00|0x10|0x00) = parse_ietf_v1_or_Q046plus_long_begin,
PBEL(0x80|0x00|0x00|0x10|0x00) = parse_ietf_v1_or_Q046plus_long_begin,
/* 1X10 XGGG: */
PBEL(0x80|0x40|0x20|0x00|0x08) = parse_ietf_v1_or_Q046plus_long_begin,
PBEL(0x80|0x00|0x20|0x00|0x08) = parse_ietf_v1_or_Q046plus_long_begin,
PBEL(0x80|0x40|0x20|0x00|0x00) = parse_ietf_v1_or_Q046plus_long_begin,
PBEL(0x80|0x00|0x20|0x00|0x00) = parse_ietf_v1_or_Q046plus_long_begin,
/* 01XX XGGG */
PBEL(0x00|0x40|0x00|0x00|0x00) = lsquic_ietf_v1_parse_packet_in_short_begin,
PBEL(0x00|0x40|0x00|0x00|0x08) = lsquic_ietf_v1_parse_packet_in_short_begin,
PBEL(0x00|0x40|0x00|0x10|0x00) = lsquic_ietf_v1_parse_packet_in_short_begin,
PBEL(0x00|0x40|0x00|0x10|0x08) = lsquic_ietf_v1_parse_packet_in_short_begin,
PBEL(0x00|0x40|0x20|0x00|0x00) = lsquic_ietf_v1_parse_packet_in_short_begin,
PBEL(0x00|0x40|0x20|0x00|0x08) = lsquic_ietf_v1_parse_packet_in_short_begin,
PBEL(0x00|0x40|0x20|0x10|0x00) = lsquic_ietf_v1_parse_packet_in_short_begin,
PBEL(0x00|0x40|0x20|0x10|0x08) = lsquic_ietf_v1_parse_packet_in_short_begin,
/* 00XX 0GGG */
PBEL(0x00|0x00|0x00|0x00|0x00) = lsquic_Q046_parse_packet_in_short_begin,
PBEL(0x00|0x00|0x00|0x10|0x00) = lsquic_Q046_parse_packet_in_short_begin,
PBEL(0x00|0x00|0x20|0x00|0x00) = lsquic_Q046_parse_packet_in_short_begin,
PBEL(0x00|0x00|0x20|0x10|0x00) = lsquic_Q046_parse_packet_in_short_begin,
/* 00XX 1GGG */
PBEL(0x00|0x00|0x00|0x00|0x08) = lsquic_gquic_parse_packet_in_begin,
PBEL(0x00|0x00|0x00|0x10|0x08) = lsquic_gquic_parse_packet_in_begin,
PBEL(0x00|0x00|0x20|0x00|0x08) = lsquic_gquic_parse_packet_in_begin,
PBEL(0x00|0x00|0x20|0x10|0x08) = lsquic_gquic_parse_packet_in_begin,
#undef PBEL
};
int
lsquic_parse_packet_in_server_begin (struct lsquic_packet_in *packet_in,
size_t length, int is_server_UNUSED, unsigned cid_len,
struct packin_parse_state *state)
{
if (length)
return parse_begin_funcs[ packet_in->pi_data[0] >> 3 ](
packet_in, length, 1, cid_len, state);
else
return -1;
}
int
lsquic_parse_packet_in_begin (lsquic_packet_in_t *packet_in, size_t length,
int is_server, unsigned cid_len, struct packin_parse_state *state)
{
if (length > 0)
{
switch (packet_in->pi_data[0] & 0xC0)
{
case 0xC0:
case 0x80:
return parse_ietf_v1_or_Q046plus_long_begin(packet_in,
length, is_server, cid_len, state);
case 0x00:
return lsquic_gquic_parse_packet_in_begin(packet_in, length,
is_server, cid_len, state);
default:
return lsquic_ietf_v1_parse_packet_in_short_begin(packet_in,
length, is_server, cid_len, state);
}
}
else
return -1;
}
int
lsquic_ietf_v1_parse_packet_in_begin (struct lsquic_packet_in *packet_in,
size_t length, int is_server, unsigned cid_len,
struct packin_parse_state *state)
{
if (length > 0)
{
if (0 == (packet_in->pi_data[0] & 0x80))
return lsquic_ietf_v1_parse_packet_in_short_begin(packet_in, length,
is_server, cid_len, state);
else
return lsquic_ietf_v1_parse_packet_in_long_begin(packet_in, length,
is_server, cid_len, state);
}
else
return -1;
}
int
lsquic_Q046_parse_packet_in_begin (struct lsquic_packet_in *packet_in,
size_t length, int is_server, unsigned cid_len,
struct packin_parse_state *state)
{
assert(!is_server);
assert(cid_len == GQUIC_CID_LEN);
if (length > 0)
{
if (0 == (packet_in->pi_data[0] & 0x80))
return lsquic_ietf_v1_parse_packet_in_short_begin(packet_in, length,
is_server, is_server ? cid_len : 0, state);
else
return lsquic_Q046_parse_packet_in_long_begin(packet_in, length,
is_server, cid_len, state);
}
else
return -1;
}
int
lsquic_Q050_parse_packet_in_begin (struct lsquic_packet_in *packet_in,
size_t length, int is_server, unsigned cid_len,
struct packin_parse_state *state)
{
assert(!is_server);
assert(cid_len == GQUIC_CID_LEN);
if (length > 0)
{
if (0 == (packet_in->pi_data[0] & 0x80))
return lsquic_ietf_v1_parse_packet_in_short_begin(packet_in, length,
is_server, is_server ? cid_len : 0, state);
else
return lsquic_Q050_parse_packet_in_long_begin(packet_in, length,
is_server, cid_len, state);
}
else
return -1;
}
/* TODO This function uses the full packet parsing functionality to get at
* the CID. This is an overkill and could be optimized -- at the cost of
* some code duplication, of course.
*/
int
lsquic_cid_from_packet (const unsigned char *buf, size_t bufsz,
lsquic_cid_t *cid)
{
struct lsquic_packet_in packet_in;
struct packin_parse_state pps;
int s;
packet_in.pi_data = (unsigned char *) buf;
s = lsquic_parse_packet_in_server_begin(&packet_in, bufsz, 1, 8, &pps);
if (0 == s && (packet_in.pi_flags & PI_CONN_ID))
{
*cid = packet_in.pi_dcid;
return 0;
}
else
return -1;
}
/* See [draft-ietf-quic-transport-25], Section 12.4 (Table 3) */
const enum quic_ft_bit lsquic_legal_frames_by_level[N_ENC_LEVS] =
{
[ENC_LEV_CLEAR] = QUIC_FTBIT_CRYPTO | QUIC_FTBIT_PADDING | QUIC_FTBIT_PING
| QUIC_FTBIT_ACK | QUIC_FTBIT_CONNECTION_CLOSE,
[ENC_LEV_EARLY] = QUIC_FTBIT_PADDING | QUIC_FTBIT_PING
| QUIC_FTBIT_STREAM | QUIC_FTBIT_RST_STREAM
| QUIC_FTBIT_BLOCKED
| QUIC_FTBIT_MAX_DATA | QUIC_FTBIT_MAX_STREAM_DATA
| QUIC_FTBIT_MAX_STREAMS | QUIC_FTBIT_STREAM_BLOCKED
| QUIC_FTBIT_STREAMS_BLOCKED
| QUIC_FTBIT_NEW_CONNECTION_ID | QUIC_FTBIT_STOP_SENDING
| QUIC_FTBIT_PATH_CHALLENGE | QUIC_FTBIT_PATH_RESPONSE
| QUIC_FTBIT_RETIRE_CONNECTION_ID,
[ENC_LEV_INIT] = QUIC_FTBIT_CRYPTO | QUIC_FTBIT_PADDING | QUIC_FTBIT_PING
| QUIC_FTBIT_ACK| QUIC_FTBIT_CONNECTION_CLOSE,
[ENC_LEV_FORW] = QUIC_FTBIT_CRYPTO | QUIC_FTBIT_PADDING | QUIC_FTBIT_PING
| QUIC_FTBIT_ACK | QUIC_FTBIT_CONNECTION_CLOSE
| QUIC_FTBIT_STREAM | QUIC_FTBIT_RST_STREAM
| QUIC_FTBIT_BLOCKED
| QUIC_FTBIT_MAX_DATA | QUIC_FTBIT_MAX_STREAM_DATA
| QUIC_FTBIT_MAX_STREAMS | QUIC_FTBIT_STREAM_BLOCKED
| QUIC_FTBIT_STREAMS_BLOCKED
| QUIC_FTBIT_NEW_CONNECTION_ID | QUIC_FTBIT_STOP_SENDING
| QUIC_FTBIT_PATH_CHALLENGE | QUIC_FTBIT_PATH_RESPONSE
| QUIC_FTBIT_HANDSHAKE_DONE | QUIC_FTBIT_ACK_FREQUENCY
| QUIC_FTBIT_RETIRE_CONNECTION_ID | QUIC_FTBIT_NEW_TOKEN
| QUIC_FTBIT_TIMESTAMP
,
};
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