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MINOR: quic: Parse long packet version from qc_parse_hd_form() 

This is to prepare the support for QUIC v2 version. The packet type
depends on the version. So, we must parse early enough the version
before defining the type of each packet.
This commit is contained in:
Frédéric Lécaille 2022-06-08 13:22:17 +02:00
parent fa94f77bc5
commit ea0ec27eb4
1 changed files with 40 additions and 7 deletions
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47
src/xprt_quic.c
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@ -4537,8 +4537,7 @@ static inline int quic_packet_read_long_header(unsigned char **buf, const unsign
{
unsigned char dcid_len, scid_len;
/* Version */
if (!quic_read_uint32(&pkt->version, (const unsigned char **)buf, end))
if (end == *buf)
return 0;
/* Destination Connection ID Length */
@ -4662,21 +4661,51 @@ static inline int qc_try_rm_hp(struct quic_conn *qc,
return 0;
}
/* Parse the header form from <byte0> first byte of <pkt> pacekt to set type.
/* Parse the header form from <byte0> first byte of <pkt> packet to set its type.
* Also set <*long_header> to 1 if this form is long, 0 if not.
*/
static inline void qc_parse_hd_form(struct quic_rx_packet *pkt,
unsigned char byte0, int *long_header)
static inline int qc_parse_hd_form(struct quic_rx_packet *pkt,
unsigned char **buf, const unsigned char *end,
int *long_header)
{
const unsigned char byte0 = **buf;
(*buf)++;
if (byte0 & QUIC_PACKET_LONG_HEADER_BIT) {
pkt->type =
unsigned char type =
(byte0 >> QUIC_PACKET_TYPE_SHIFT) & QUIC_PACKET_TYPE_BITMASK;
*long_header = 1;
/* Version */
if (!quic_read_uint32(&pkt->version, (const unsigned char **)buf, end))
return 0;
if (pkt->version != QUIC_PROTOCOL_VERSION_2_DRAFT) {
pkt->type = type;
}
else {
switch (type) {
case 0:
pkt->type = QUIC_PACKET_TYPE_RETRY;
break;
case 1:
pkt->type = QUIC_PACKET_TYPE_INITIAL;
break;
case 2:
pkt->type = QUIC_PACKET_TYPE_0RTT;
break;
case 3:
pkt->type = QUIC_PACKET_TYPE_HANDSHAKE;
break;
}
}
}
else {
pkt->type = QUIC_PACKET_TYPE_SHORT;
*long_header = 0;
}
return 1;
}
/*
@ -5242,7 +5271,11 @@ static void qc_lstnr_pkt_rcv(unsigned char *buf, const unsigned char *end,
}
/* Header form */
qc_parse_hd_form(pkt, *buf++, &long_header);
if (!qc_parse_hd_form(pkt, &buf, end, &long_header)) {
TRACE_PROTO("Packet dropped", QUIC_EV_CONN_LPKT);
goto drop;
}
if (long_header) {
uint64_t len;
struct quic_cid odcid;