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BUG/MINOR: quic: use proper error code on invalid received TP value

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As per RFC 9000, checks must be implemented to reject invalid values for
received transport parameters. Such values are dependent on the
parameter type.

Checks were already implemented for ack_delay_exponent and
active_connection_id_limit, accordingly with the QUIC specification.
However, the connection was closed with an incorrect error code. Fix
this to ensure that TRANSPORT_PARAMETER_ERROR code is used as expected.

This should be backported up to 2.6. Note that is relies on previous
patch "MINOR: quic: extend return value on TP parsing".
This commit is contained in:
Amaury Denoyelle 2025-05-06 18:00:43 +02:00
parent 10f1f1adce
commit b60a17aad7
1 changed files with 18 additions and 6 deletions
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24
src/quic_tp.c
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@ -336,9 +336,17 @@ quic_transport_param_decode(struct quic_transport_params *p, int server,
return QUIC_TP_DEC_ERR_TRUNC;
break;
case QUIC_TP_ACK_DELAY_EXPONENT:
if (!quic_dec_int(&p->ack_delay_exponent, buf, end) ||
p->ack_delay_exponent > QUIC_TP_ACK_DELAY_EXPONENT_LIMIT)
if (!quic_dec_int(&p->ack_delay_exponent, buf, end))
return QUIC_TP_DEC_ERR_TRUNC;
/* RFC 9000 18.2. Transport Parameter Definitions
*
* ack_delay_exponent (0x0a): [...]
* Values above 20 are invalid.
*/
if (p->ack_delay_exponent > QUIC_TP_ACK_DELAY_EXPONENT_LIMIT)
return QUIC_TP_DEC_ERR_INVAL;
break;
case QUIC_TP_MAX_ACK_DELAY:
if (!quic_dec_int(&p->max_ack_delay, buf, end) ||
@ -656,12 +664,16 @@ quic_transport_params_decode(struct quic_transport_params *p, int server,
return QUIC_TP_DEC_ERR_INVAL;
}
/* Note that if not received by the peer, active_connection_id_limit will
* have QUIC_TP_DFLT_ACTIVE_CONNECTION_ID_LIMIT as default value. This
* is also the minimum value for this transport parameter.
/* RFC 9000 18.2. Transport Parameter Definitions
*
* active_connection_id_limit (0x0e):
* [...] The value of the
* active_connection_id_limit parameter MUST be at least 2. An
* endpoint that receives a value less than 2 MUST close the
* connection with an error of type TRANSPORT_PARAMETER_ERROR.
*/
if (p->active_connection_id_limit < QUIC_TP_DFLT_ACTIVE_CONNECTION_ID_LIMIT)
return QUIC_TP_DEC_ERR_TRUNC;
return QUIC_TP_DEC_ERR_INVAL;
return QUIC_TP_DEC_ERR_NONE;
}