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MINOR: quic-be: add a "CC connection" backend TX buffer pool

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A QUIC client must be able to close a connection sending Initial packets. But
QUIC client Initial packets must always be at least 1200 bytes long. To reduce
the memory use of TX buffers of a connection when in "closing" state, a pool
was dedicated for this purpose but with a too much reduced TX buffer size
(QUIC_MAX_CC_BUFSIZE).

This patch adds a "closing state connection" TX buffer pool with the same role
for QUIC backends.
This commit is contained in:
Frederic Lecaille 2025-06-24 10:55:22 +02:00
parent 1e6d8f199c
commit 9cb2acd2f2
3 changed files with 23 additions and 3 deletions
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2
include/haproxy/quic_tx-t.h
View File

@ -4,6 +4,7 @@
#define QUIC_MIN_CC_PKTSIZE 128
#define QUIC_DGRAM_HEADLEN (sizeof(uint16_t) + sizeof(void *))
#define QUIC_MAX_CC_BUFSIZE (2 * (QUIC_MIN_CC_PKTSIZE + QUIC_DGRAM_HEADLEN))
#define QUIC_BE_MAX_CC_BUFSIZE MAX(QUIC_INITIAL_IPV6_MTU, QUIC_INITIAL_IPV4_MTU)
/* Sendmsg input buffer cannot be bigger than 65535 bytes. This comes from UDP
* header which uses a 2-bytes length field. QUIC datagrams are limited to 1252
@ -21,6 +22,7 @@
extern struct pool_head *pool_head_quic_tx_packet;
extern struct pool_head *pool_head_quic_cc_buf;
extern struct pool_head *pool_head_quic_be_cc_buf;
/* Flag a sent packet as being an ack-eliciting packet. */
#define QUIC_FL_TX_PACKET_ACK_ELICITING (1UL << 0)

5
src/quic_conn.c
View File

@ -650,7 +650,12 @@ static void quic_release_cc_conn(struct quic_conn_closed *cc_qc)
free_quic_conn_cids(qc);
pool_free(pool_head_quic_cids, cc_qc->cids);
cc_qc->cids = NULL;
if (objt_listener(cc_qc->target)) {
pool_free(pool_head_quic_cc_buf, cc_qc->cc_buf_area);
}
else {
pool_free(pool_head_quic_be_cc_buf, cc_qc->cc_buf_area);
}
cc_qc->cc_buf_area = NULL;
/* free the SSL sock context */
pool_free(pool_head_quic_conn_closed, cc_qc);

17
src/quic_tx.c
View File

@ -33,6 +33,7 @@
DECLARE_POOL(pool_head_quic_tx_packet, "quic_tx_packet", sizeof(struct quic_tx_packet));
DECLARE_POOL(pool_head_quic_cc_buf, "quic_cc_buf", QUIC_MAX_CC_BUFSIZE);
DECLARE_POOL(pool_head_quic_be_cc_buf, "quic_be_cc_buf", QUIC_BE_MAX_CC_BUFSIZE);
static struct quic_tx_packet *qc_build_pkt(unsigned char **pos, const unsigned char *buf_end,
struct quic_enc_level *qel, struct quic_tls_ctx *ctx,
@ -129,16 +130,28 @@ struct buffer *qc_get_txb(struct quic_conn *qc)
struct buffer *buf;
if (qc->flags & QUIC_FL_CONN_IMMEDIATE_CLOSE) {
struct pool_head *ph;
size_t psz;
if (objt_listener(qc->target)) {
ph = pool_head_quic_cc_buf;
psz = QUIC_MAX_CC_BUFSIZE;
}
else {
ph = pool_head_quic_be_cc_buf;
psz = QUIC_BE_MAX_CC_BUFSIZE;
}
TRACE_PROTO("Immediate close required", QUIC_EV_CONN_PHPKTS, qc);
buf = &qc->tx.cc_buf;
if (b_is_null(buf)) {
qc->tx.cc_buf_area = pool_alloc(pool_head_quic_cc_buf);
qc->tx.cc_buf_area = pool_alloc(ph);
if (!qc->tx.cc_buf_area)
goto err;
}
/* In every case, initialize ->tx.cc_buf */
qc->tx.cc_buf = b_make(qc->tx.cc_buf_area, QUIC_MAX_CC_BUFSIZE, 0, 0);
qc->tx.cc_buf = b_make(qc->tx.cc_buf_area, psz, 0, 0);
}
else {
buf = qc_txb_alloc(qc);