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Fix: heed peer's max_packet_size transport parameter

This commit is contained in:
Dmitri Tikhonov 2020-04-17 12:11:28 -04:00
parent 76e2cfc99a
commit 35fc553f01
6 changed files with 83 additions and 36 deletions
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14
include/lsquic.h
View File

@ -339,6 +339,9 @@ typedef struct ssl_ctx_st * (*lsquic_lookup_cert_f)(
/* 1: Cubic; 2: BBR */
#define LSQUIC_DF_CC_ALGO 1
/** By default, incoming packet size is not limited. */
#define LSQUIC_DF_MAX_PACKET_SIZE_RX 0
struct lsquic_engine_settings {
/**
* This is a bit mask wherein each bit corresponds to a value in
@ -737,6 +740,17 @@ struct lsquic_engine_settings {
* Default value is @ref LSQUIC_DF_TIMESTAMPS
*/
int es_timestamps;
/**
* Maximum packet size we are willing to receive. This is sent to
* peer in transport parameters: the library does not enforce this
* limit for incoming packets.
*
* If set to zero, limit is not set.
*
* Default value is @ref LSQUIC_DF_MAX_PACKET_SIZE_RX
*/
unsigned short es_max_packet_size_rx;
};
/* Initialize `settings' to default values */

7
src/liblsquic/lsquic_enc_sess_ietf.c
View File

@ -532,7 +532,6 @@ gen_trans_params (struct enc_sess_iquic *enc_sess, unsigned char *buf,
= TP_DEF_ACK_DELAY_EXP;
params.tp_max_idle_timeout = settings->es_idle_timeout * 1000;
params.tp_max_ack_delay = TP_DEF_MAX_ACK_DELAY;
params.tp_max_packet_size = 1370 /* XXX: based on socket */;
params.tp_active_connection_id_limit = MAX_IETF_CONN_DCIDS;
params.tp_set |= (1 << TPI_INIT_MAX_DATA)
| (1 << TPI_INIT_MAX_STREAM_DATA_BIDI_LOCAL)
@ -543,9 +542,13 @@ gen_trans_params (struct enc_sess_iquic *enc_sess, unsigned char *buf,
| (1 << TPI_ACK_DELAY_EXPONENT)
| (1 << TPI_MAX_IDLE_TIMEOUT)
| (1 << TPI_MAX_ACK_DELAY)
| (1 << TPI_MAX_PACKET_SIZE)
| (1 << TPI_ACTIVE_CONNECTION_ID_LIMIT)
;
if (settings->es_max_packet_size_rx)
{
params.tp_max_packet_size = settings->es_max_packet_size_rx;
params.tp_set |= 1 << TPI_MAX_PACKET_SIZE;
}
if (!settings->es_allow_migration)
params.tp_set |= 1 << TPI_DISABLE_ACTIVE_MIGRATION;
if (settings->es_ql_bits)

75
src/liblsquic/lsquic_mini_conn_ietf.c
View File

@ -162,6 +162,50 @@ read_from_msg_ctx (void *ctx, void *buf, size_t len)
}
static int
imico_chlo_has_been_consumed (const struct ietf_mini_conn *conn)
{
return conn->imc_streams[ENC_LEV_CLEAR].mcs_read_off > 3
&& conn->imc_streams[ENC_LEV_CLEAR].mcs_read_off >= conn->imc_ch_len;
}
static int
imico_maybe_process_params (struct ietf_mini_conn *conn)
{
const struct transport_params *params;
if (imico_chlo_has_been_consumed(conn)
&& (conn->imc_flags & (IMC_ENC_SESS_INITED|IMC_HAVE_TP))
== IMC_ENC_SESS_INITED)
{
params = conn->imc_conn.cn_esf.i->esfi_get_peer_transport_params(
conn->imc_conn.cn_enc_session);
if (params)
{
conn->imc_flags |= IMC_HAVE_TP;
conn->imc_ack_exp = params->tp_ack_delay_exponent;
if (params->tp_set & (1 << TPI_MAX_PACKET_SIZE))
{
if (params->tp_numerics[TPI_MAX_PACKET_SIZE]
< conn->imc_path.np_pack_size)
conn->imc_path.np_pack_size =
params->tp_numerics[TPI_MAX_PACKET_SIZE];
}
LSQ_DEBUG("read transport params, packet size is set to %hu bytes",
conn->imc_path.np_pack_size);
}
else
{
conn->imc_flags |= IMC_BAD_TRANS_PARAMS;
return -1;
}
}
return 0;
}
static ssize_t
imico_stream_write (void *stream, const void *bufp, size_t bufsz)
{
@ -175,6 +219,9 @@ imico_stream_write (void *stream, const void *bufp, size_t bufsz)
const unsigned char *p;
int len;
if (0 != imico_maybe_process_params(conn))
return -1;
if (PNS_INIT == lsquic_enclev2pns[ cryst->mcs_enc_level ]
&& (conn->imc_flags & IMC_IGNORE_INIT))
{
@ -281,14 +328,6 @@ imico_read_chlo_size (struct ietf_mini_conn *conn, const unsigned char *buf,
}
static int
imico_chlo_has_been_consumed (const struct ietf_mini_conn *conn)
{
return conn->imc_streams[ENC_LEV_CLEAR].mcs_read_off > 3
&& conn->imc_streams[ENC_LEV_CLEAR].mcs_read_off >= conn->imc_ch_len;
}
static ssize_t
imico_stream_readf (void *stream,
size_t (*readf)(void *, const unsigned char *, size_t, int), void *ctx)
@ -765,7 +804,6 @@ imico_process_crypto_frame (IMICO_PROC_FRAME_ARGS)
int parsed_len;
enum enc_level enc_level, i;
struct stream_frame stream_frame;
const struct transport_params *params;
parsed_len = conn->imc_conn.cn_pf->pf_parse_crypto_frame(p, len,
&stream_frame);
@ -836,25 +874,6 @@ imico_process_crypto_frame (IMICO_PROC_FRAME_ARGS)
}
if (enc_level == ENC_LEV_CLEAR
&& imico_chlo_has_been_consumed(conn)
&& (conn->imc_flags & (IMC_ENC_SESS_INITED|IMC_HAVE_TP))
== IMC_ENC_SESS_INITED)
{
params = conn->imc_conn.cn_esf.i->esfi_get_peer_transport_params(
conn->imc_conn.cn_enc_session);
if (params)
{
conn->imc_flags |= IMC_HAVE_TP;
conn->imc_ack_exp = params->tp_ack_delay_exponent;
}
else
{
conn->imc_flags |= IMC_BAD_TRANS_PARAMS;
return 0;
}
}
return parsed_len;
}

5
src/liblsquic/lsquic_trans_params.c
View File

@ -128,6 +128,9 @@ static const uint64_t def_vals[MAX_NUM_WITH_DEF_TPI + 1] =
static const uint64_t max_vals[MAX_NUMERIC_TPI + 1] =
{
/* We don't enforce the maximum practical UDP payload value of 65527, as
* it is not required by the spec and is not necessary.
*/
[TPI_MAX_PACKET_SIZE] = VINT_MAX_VALUE,
[TPI_ACK_DELAY_EXPONENT] = VINT_MAX_VALUE,
[TPI_INIT_MAX_STREAMS_UNI] = VINT_MAX_VALUE,
@ -146,6 +149,8 @@ static const uint64_t max_vals[MAX_NUMERIC_TPI + 1] =
static const uint64_t min_vals[MAX_NUMERIC_TPI + 1] =
{
/* On the other hand, we do enforce the lower bound. */
[TPI_MAX_PACKET_SIZE] = 1200,
[TPI_MIN_ACK_DELAY] = 1,
};

5
test/test_common.c
View File

@ -1911,6 +1911,11 @@ set_engine_option (struct lsquic_engine_settings *settings,
settings->es_qpack_dec_max_size = atoi(val);
return 0;
}
if (0 == strncmp(name, "max_packet_size_rx", 18))
{
settings->es_max_packet_size_rx = atoi(val);
return 0;
}
break;
case 20:
if (0 == strncmp(name, "max_header_list_size", 20))

13
test/unittests/test_trapa.c
View File

@ -63,15 +63,16 @@ static const struct trapa_test tests[] =
| (1 << TPI_ACTIVE_CONNECTION_ID_LIMIT),
.tp_init_max_stream_data_bidi_local = 0x12348877,
.tp_init_max_data = 0xAABB,
.tp_max_packet_size = 1213,
.tp_max_idle_timeout = 10 * 1000,
.tp_max_ack_delay = TP_DEF_MAX_ACK_DELAY,
.tp_active_connection_id_limit = 7,
},
.is_server = 0,
.enc_len = 25,
.enc_len = 26,
.encoded =
/* Idle timeout */ "\x01\x02\x67\x10"
/* Packet size */ "\x03\x01\x00"
/* Packet size */ "\x03\x02\x44\xBD"
/* Max data */ "\x04\x04\x80\x00\xAA\xBB"
/* Bidi local */ "\x05\x04\x92\x34\x88\x77"
/* Ack delay exp */ "\x0A\x01\x00"
@ -103,13 +104,13 @@ static const struct trapa_test tests[] =
TP_DEFAULT_VALUES,
.tp_init_max_data = 0x123456,
.tp_init_max_stream_data_bidi_local = 0xABCDEF88,
.tp_max_packet_size = 0x333,
.tp_max_packet_size = 0x555,
},
.is_server = 1,
.addl_set = 1 << TPI_DISABLE_ACTIVE_MIGRATION,
.enc_len = 22,
.encoded =
/* Packet size */ "\x03\x02\x43\x33"
/* Packet size */ "\x03\x02\x45\x55"
/* Max data */ "\x04\x04\x80\x12\x34\x56"
/* Bidi local */ "\x05\x08\xC0\x00\x00\x00\xAB\xCD\xEF\x88"
/* Migration */ "\x0C\x00"
@ -124,7 +125,7 @@ static const struct trapa_test tests[] =
.params = {
TP_DEFAULT_VALUES,
.tp_max_ack_delay = 25,
.tp_max_packet_size = 0x333,
.tp_max_packet_size = 0x555,
.tp_preferred_address = {
.ipv4_addr = "\x01\x02\x03\x04",
.ipv4_port = 0x1234,
@ -148,7 +149,7 @@ static const struct trapa_test tests[] =
"\x0B" /* CID len */
"\x20\x21\x22\x23\x24\x25\x26\x27\x28\x29\x2A"
"\x30\x31\x32\x33\x34\x35\x36\x37\x38\x39\x3A\x3B\x3C\x3D\x3E\x3F"
/* Packet size */ "\x03\x02\x43\x33"
/* Packet size */ "\x03\x02\x45\x55"
/* Trailer to make the end easily visible in gdb: */
"\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF"
},