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QUIC: congestion control in ngx_quic_frame_sendto().

Browse Source 
Previously ngx_quic_frame_sendto() ignored congestion control and did not
contribute to in_flight counter.

Now congestion control window is checked unless ignore_congestion flag is set.
Also, in_flight counter is incremented and the frame is stored in ctx->sent
queue if it's ack-eliciting.  This behavior is now similar to
ngx_quic_output_packet().
This commit is contained in:
Roman Arutyunyan 2023-11-29 21:41:29 +04:00
parent 0c0f340554
commit ccca701dc6
4 changed files with 108 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
src/event/quic/ngx_event_quic_ack.c
View File

@ -593,6 +593,7 @@ ngx_quic_resend_frames(ngx_connection_t *c, ngx_quic_send_ctx_t *ctx)
break;
case NGX_QUIC_FT_PING:
case NGX_QUIC_FT_PATH_CHALLENGE:
case NGX_QUIC_FT_PATH_RESPONSE:
case NGX_QUIC_FT_CONNECTION_CLOSE:
ngx_quic_free_frame(c, f);
@ -824,11 +825,11 @@ void ngx_quic_lost_handler(ngx_event_t *ev)
void
ngx_quic_pto_handler(ngx_event_t *ev)
{
ngx_uint_t i;
ngx_uint_t i, n;
ngx_msec_t now;
ngx_queue_t *q;
ngx_connection_t *c;
ngx_quic_frame_t *f, frame;
ngx_quic_frame_t *f;
ngx_quic_send_ctx_t *ctx;
ngx_quic_connection_t *qc;
@ -865,16 +866,20 @@ ngx_quic_pto_handler(ngx_event_t *ev)
"quic pto %s pto_count:%ui",
ngx_quic_level_name(ctx->level), qc->pto_count);
ngx_memzero(&frame, sizeof(ngx_quic_frame_t));
for (n = 0; n < 2; n++) {
frame.level = ctx->level;
frame.type = NGX_QUIC_FT_PING;
f = ngx_quic_alloc_frame(c);
if (f == NULL) {
goto failed;
}
if (ngx_quic_frame_sendto(c, &frame, 0, qc->path) != NGX_OK
|| ngx_quic_frame_sendto(c, &frame, 0, qc->path) != NGX_OK)
{
ngx_quic_close_connection(c, NGX_ERROR);
return;
f->level = ctx->level;
f->type = NGX_QUIC_FT_PING;
f->ignore_congestion = 1;
if (ngx_quic_frame_sendto(c, f, 0, qc->path) == NGX_ERROR) {
goto failed;
}
}
}
@ -883,6 +888,13 @@ ngx_quic_pto_handler(ngx_event_t *ev)
ngx_quic_set_lost_timer(c);
ngx_quic_connstate_dbg(c);
return;
failed:
ngx_quic_close_connection(c, NGX_ERROR);
return;
}

51
src/event/quic/ngx_event_quic_migration.c
View File

@ -37,7 +37,7 @@ ngx_quic_handle_path_challenge_frame(ngx_connection_t *c,
ngx_quic_header_t *pkt, ngx_quic_path_challenge_frame_t *f)
{
size_t min;
ngx_quic_frame_t frame, *fp;
ngx_quic_frame_t *fp;
ngx_quic_connection_t *qc;
if (pkt->level != ssl_encryption_application || pkt->path_challenged) {
@ -50,11 +50,14 @@ ngx_quic_handle_path_challenge_frame(ngx_connection_t *c,
qc = ngx_quic_get_connection(c);
ngx_memzero(&frame, sizeof(ngx_quic_frame_t));
fp = ngx_quic_alloc_frame(c);
if (fp == NULL) {
return NGX_ERROR;
}
frame.level = ssl_encryption_application;
frame.type = NGX_QUIC_FT_PATH_RESPONSE;
frame.u.path_response = *f;
fp->level = ssl_encryption_application;
fp->type = NGX_QUIC_FT_PATH_RESPONSE;
fp->u.path_response = *f;
/*
* RFC 9000, 8.2.2. Path Validation Responses
@ -73,7 +76,7 @@ ngx_quic_handle_path_challenge_frame(ngx_connection_t *c,
min = (ngx_quic_path_limit(c, pkt->path, 1200) < 1200) ? 0 : 1200;
if (ngx_quic_frame_sendto(c, &frame, min, pkt->path) == NGX_ERROR) {
if (ngx_quic_frame_sendto(c, fp, min, pkt->path) == NGX_ERROR) {
return NGX_ERROR;
}
@ -546,22 +549,25 @@ ngx_quic_validate_path(ngx_connection_t *c, ngx_quic_path_t *path)
static ngx_int_t
ngx_quic_send_path_challenge(ngx_connection_t *c, ngx_quic_path_t *path)
{
size_t min;
ngx_uint_t n;
ngx_quic_frame_t frame;
size_t min;
ngx_uint_t n;
ngx_quic_frame_t *frame;
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
"quic path seq:%uL send path_challenge tries:%ui",
path->seqnum, path->tries);
ngx_memzero(&frame, sizeof(ngx_quic_frame_t));
frame.level = ssl_encryption_application;
frame.type = NGX_QUIC_FT_PATH_CHALLENGE;
for (n = 0; n < 2; n++) {
ngx_memcpy(frame.u.path_challenge.data, path->challenge[n], 8);
frame = ngx_quic_alloc_frame(c);
if (frame == NULL) {
return NGX_ERROR;
}
frame->level = ssl_encryption_application;
frame->type = NGX_QUIC_FT_PATH_CHALLENGE;
ngx_memcpy(frame->u.path_challenge.data, path->challenge[n], 8);
/*
* RFC 9000, 8.2.1. Initiating Path Validation
@ -574,7 +580,7 @@ ngx_quic_send_path_challenge(ngx_connection_t *c, ngx_quic_path_t *path)
min = (ngx_quic_path_limit(c, path, 1200) < 1200) ? 0 : 1200;
if (ngx_quic_frame_sendto(c, &frame, min, path) == NGX_ERROR) {
if (ngx_quic_frame_sendto(c, frame, min, path) == NGX_ERROR) {
return NGX_ERROR;
}
}
@ -883,14 +889,17 @@ ngx_quic_send_path_mtu_probe(ngx_connection_t *c, ngx_quic_path_t *path)
size_t mtu;
ngx_int_t rc;
ngx_uint_t log_error;
ngx_quic_frame_t frame;
ngx_quic_frame_t *frame;
ngx_quic_send_ctx_t *ctx;
ngx_quic_connection_t *qc;
ngx_memzero(&frame, sizeof(ngx_quic_frame_t));
frame = ngx_quic_alloc_frame(c);
if (frame == NULL) {
return NGX_ERROR;
}
frame.level = ssl_encryption_application;
frame.type = NGX_QUIC_FT_PING;
frame->level = ssl_encryption_application;
frame->type = NGX_QUIC_FT_PING;
qc = ngx_quic_get_connection(c);
ctx = ngx_quic_get_send_ctx(qc, ssl_encryption_application);
@ -907,7 +916,7 @@ ngx_quic_send_path_mtu_probe(ngx_connection_t *c, ngx_quic_path_t *path)
mtu = path->mtu;
path->mtu = path->mtud;
rc = ngx_quic_frame_sendto(c, &frame, path->mtud, path);
rc = ngx_quic_frame_sendto(c, frame, path->mtud, path);
path->mtu = mtu;
c->log_error = log_error;

65
src/event/quic/ngx_event_quic_output.c
View File

@ -844,7 +844,7 @@ ngx_quic_send_stateless_reset(ngx_connection_t *c, ngx_quic_conf_t *conf,
ngx_int_t
ngx_quic_send_cc(ngx_connection_t *c)
{
ngx_quic_frame_t frame;
ngx_quic_frame_t *frame;
ngx_quic_connection_t *qc;
qc = ngx_quic_get_connection(c);
@ -860,22 +860,27 @@ ngx_quic_send_cc(ngx_connection_t *c)
return NGX_OK;
}
ngx_memzero(&frame, sizeof(ngx_quic_frame_t));
frame = ngx_quic_alloc_frame(c);
if (frame == NULL) {
return NGX_ERROR;
}
frame.level = qc->error_level;
frame.type = qc->error_app ? NGX_QUIC_FT_CONNECTION_CLOSE_APP
: NGX_QUIC_FT_CONNECTION_CLOSE;
frame.u.close.error_code = qc->error;
frame.u.close.frame_type = qc->error_ftype;
frame->level = qc->error_level;
frame->type = qc->error_app ? NGX_QUIC_FT_CONNECTION_CLOSE_APP
: NGX_QUIC_FT_CONNECTION_CLOSE;
frame->u.close.error_code = qc->error;
frame->u.close.frame_type = qc->error_ftype;
if (qc->error_reason) {
frame.u.close.reason.len = ngx_strlen(qc->error_reason);
frame.u.close.reason.data = (u_char *) qc->error_reason;
frame->u.close.reason.len = ngx_strlen(qc->error_reason);
frame->u.close.reason.data = (u_char *) qc->error_reason;
}
frame->ignore_congestion = 1;
qc->last_cc = ngx_current_msec;
return ngx_quic_frame_sendto(c, &frame, 0, qc->path);
return ngx_quic_frame_sendto(c, frame, 0, qc->path);
}
@ -1184,22 +1189,32 @@ ngx_quic_frame_sendto(ngx_connection_t *c, ngx_quic_frame_t *frame,
size_t max, max_payload, min_payload, pad;
ssize_t len, sent;
ngx_str_t res;
ngx_msec_t now;
ngx_quic_header_t pkt;
ngx_quic_send_ctx_t *ctx;
ngx_quic_congestion_t *cg;
ngx_quic_connection_t *qc;
static u_char src[NGX_QUIC_MAX_UDP_PAYLOAD_SIZE];
static u_char dst[NGX_QUIC_MAX_UDP_PAYLOAD_SIZE];
qc = ngx_quic_get_connection(c);
cg = &qc->congestion;
ctx = ngx_quic_get_send_ctx(qc, frame->level);
now = ngx_current_msec;
max = ngx_quic_path_limit(c, path, path->mtu);
ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0,
"quic sendto %s packet max:%uz min:%uz",
ngx_quic_level_name(ctx->level), max, min);
if (cg->in_flight >= cg->window && !frame->ignore_congestion) {
ngx_quic_free_frame(c, frame);
return NGX_AGAIN;
}
ngx_quic_init_packet(c, ctx, &pkt, path);
min_payload = ngx_quic_payload_size(&pkt, min);
@ -1210,6 +1225,7 @@ ngx_quic_frame_sendto(ngx_connection_t *c, ngx_quic_frame_t *frame,
min_payload = ngx_max(min_payload, pad);
if (min_payload > max_payload) {
ngx_quic_free_frame(c, frame);
return NGX_AGAIN;
}
@ -1221,11 +1237,13 @@ ngx_quic_frame_sendto(ngx_connection_t *c, ngx_quic_frame_t *frame,
len = ngx_quic_create_frame(NULL, frame);
if ((size_t) len > max_payload) {
ngx_quic_free_frame(c, frame);
return NGX_AGAIN;
}
len = ngx_quic_create_frame(src, frame);
if (len == -1) {
ngx_quic_free_frame(c, frame);
return NGX_ERROR;
}
@ -1242,18 +1260,45 @@ ngx_quic_frame_sendto(ngx_connection_t *c, ngx_quic_frame_t *frame,
ngx_quic_log_packet(c->log, &pkt);
if (ngx_quic_encrypt(&pkt, &res) != NGX_OK) {
ngx_quic_free_frame(c, frame);
return NGX_ERROR;
}
frame->pnum = ctx->pnum;
frame->first = now;
frame->last = now;
frame->plen = res.len;
ctx->pnum++;
sent = ngx_quic_send(c, res.data, res.len, path->sockaddr, path->socklen);
if (sent < 0) {
ngx_quic_free_frame(c, frame);
return sent;
}
path->sent += sent;
if (frame->need_ack && !qc->closing) {
ngx_queue_insert_tail(&ctx->sent, &frame->queue);
cg->in_flight += frame->plen;
} else {
ngx_quic_free_frame(c, frame);
return NGX_OK;
}
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
"quic congestion send if:%uz", cg->in_flight);
if (!qc->send_timer_set) {
qc->send_timer_set = 1;
ngx_add_timer(c->read, qc->tp.max_idle_timeout);
}
ngx_quic_set_lost_timer(c);
return NGX_OK;
}

1
src/event/quic/ngx_event_quic_transport.h
View File

@ -271,6 +271,7 @@ struct ngx_quic_frame_s {
ssize_t len;
unsigned need_ack:1;
unsigned pkt_need_ack:1;
unsigned ignore_congestion:1;
ngx_chain_t *data;
union {