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nginx-quic/src/event/quic/ngx_event_quic.c

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/*
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#include <ngx_event_quic_connection.h>
static ngx_quic_connection_t *ngx_quic_new_connection(ngx_connection_t *c,
ngx_quic_conf_t *conf, ngx_quic_header_t *pkt);
static ngx_int_t ngx_quic_handle_stateless_reset(ngx_connection_t *c,
ngx_quic_header_t *pkt);
static void ngx_quic_input_handler(ngx_event_t *rev);
static void ngx_quic_close_timer_handler(ngx_event_t *ev);
static ngx_int_t ngx_quic_handle_datagram(ngx_connection_t *c, ngx_buf_t *b,
ngx_quic_conf_t *conf);
static ngx_int_t ngx_quic_handle_packet(ngx_connection_t *c,
ngx_quic_conf_t *conf, ngx_quic_header_t *pkt);
static ngx_int_t ngx_quic_handle_payload(ngx_connection_t *c,
ngx_quic_header_t *pkt);
static ngx_int_t ngx_quic_check_csid(ngx_quic_connection_t *qc,
ngx_quic_header_t *pkt);
static ngx_int_t ngx_quic_handle_frames(ngx_connection_t *c,
ngx_quic_header_t *pkt);
static void ngx_quic_push_handler(ngx_event_t *ev);
static ngx_core_module_t ngx_quic_module_ctx = {
ngx_string("quic"),
NULL,
NULL
};
ngx_module_t ngx_quic_module = {
NGX_MODULE_V1,
&ngx_quic_module_ctx, /* module context */
NULL, /* module directives */
NGX_CORE_MODULE, /* module type */
NULL, /* init master */
NULL, /* init module */
NULL, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
#if (NGX_DEBUG)
void
ngx_quic_connstate_dbg(ngx_connection_t *c)
{
u_char *p, *last;
ngx_quic_connection_t *qc;
u_char buf[NGX_MAX_ERROR_STR];
p = buf;
last = p + sizeof(buf);
qc = ngx_quic_get_connection(c);
p = ngx_slprintf(p, last, "state:");
if (qc) {
if (qc->error) {
p = ngx_slprintf(p, last, "%s", qc->error_app ? " app" : "");
p = ngx_slprintf(p, last, " error:%ui", qc->error);
if (qc->error_reason) {
p = ngx_slprintf(p, last, " \"%s\"", qc->error_reason);
}
}
p = ngx_slprintf(p, last, "%s", qc->shutdown ? " shutdown" : "");
p = ngx_slprintf(p, last, "%s", qc->closing ? " closing" : "");
p = ngx_slprintf(p, last, "%s", qc->draining ? " draining" : "");
p = ngx_slprintf(p, last, "%s", qc->key_phase ? " kp" : "");
} else {
p = ngx_slprintf(p, last, " early");
}
if (c->read->timer_set) {
p = ngx_slprintf(p, last,
qc && qc->send_timer_set ? " send:%M" : " read:%M",
c->read->timer.key - ngx_current_msec);
}
if (qc) {
if (qc->push.timer_set) {
p = ngx_slprintf(p, last, " push:%M",
qc->push.timer.key - ngx_current_msec);
}
if (qc->pto.timer_set) {
p = ngx_slprintf(p, last, " pto:%M",
qc->pto.timer.key - ngx_current_msec);
}
if (qc->close.timer_set) {
p = ngx_slprintf(p, last, " close:%M",
qc->close.timer.key - ngx_current_msec);
}
}
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
"quic %*s", p - buf, buf);
}
#endif
ngx_int_t
ngx_quic_apply_transport_params(ngx_connection_t *c, ngx_quic_tp_t *ctp)
{
ngx_str_t scid;
ngx_quic_connection_t *qc;
qc = ngx_quic_get_connection(c);
scid.data = qc->path->cid->id;
scid.len = qc->path->cid->len;
if (scid.len != ctp->initial_scid.len
|| ngx_memcmp(scid.data, ctp->initial_scid.data, scid.len) != 0)
{
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"quic client initial_source_connection_id mismatch");
return NGX_ERROR;
}
if (ctp->max_udp_payload_size < NGX_QUIC_MIN_INITIAL_SIZE
|| ctp->max_udp_payload_size > NGX_QUIC_MAX_UDP_PAYLOAD_SIZE)
{
qc->error = NGX_QUIC_ERR_TRANSPORT_PARAMETER_ERROR;
qc->error_reason = "invalid maximum packet size";
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"quic maximum packet size is invalid");
return NGX_ERROR;
} else if (ctp->max_udp_payload_size > ngx_quic_max_udp_payload(c)) {
ctp->max_udp_payload_size = ngx_quic_max_udp_payload(c);
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
"quic client maximum packet size truncated");
}
if (ctp->active_connection_id_limit < 2) {
qc->error = NGX_QUIC_ERR_TRANSPORT_PARAMETER_ERROR;
qc->error_reason = "invalid active_connection_id_limit";
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"quic active_connection_id_limit is invalid");
return NGX_ERROR;
}
if (ctp->ack_delay_exponent > 20) {
qc->error = NGX_QUIC_ERR_TRANSPORT_PARAMETER_ERROR;
qc->error_reason = "invalid ack_delay_exponent";
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"quic ack_delay_exponent is invalid");
return NGX_ERROR;
}
if (ctp->max_ack_delay >= 16384) {
qc->error = NGX_QUIC_ERR_TRANSPORT_PARAMETER_ERROR;
qc->error_reason = "invalid max_ack_delay";
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"quic max_ack_delay is invalid");
return NGX_ERROR;
}
if (ctp->max_idle_timeout > 0
&& ctp->max_idle_timeout < qc->tp.max_idle_timeout)
{
qc->tp.max_idle_timeout = ctp->max_idle_timeout;
}
qc->streams.server_max_streams_bidi = ctp->initial_max_streams_bidi;
qc->streams.server_max_streams_uni = ctp->initial_max_streams_uni;
ngx_memcpy(&qc->ctp, ctp, sizeof(ngx_quic_tp_t));
return NGX_OK;
}
void
ngx_quic_run(ngx_connection_t *c, ngx_quic_conf_t *conf)
{
ngx_int_t rc;
ngx_quic_connection_t *qc;
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0, "quic run");
rc = ngx_quic_handle_datagram(c, c->buffer, conf);
if (rc != NGX_OK) {
ngx_quic_close_connection(c, rc);
return;
}
/* quic connection is now created */
qc = ngx_quic_get_connection(c);
ngx_add_timer(c->read, qc->tp.max_idle_timeout);
ngx_quic_connstate_dbg(c);
c->read->handler = ngx_quic_input_handler;
return;
}
static ngx_quic_connection_t *
ngx_quic_new_connection(ngx_connection_t *c, ngx_quic_conf_t *conf,
ngx_quic_header_t *pkt)
{
ngx_uint_t i;
ngx_quic_tp_t *ctp;
ngx_quic_connection_t *qc;
qc = ngx_pcalloc(c->pool, sizeof(ngx_quic_connection_t));
if (qc == NULL) {
return NULL;
}
qc->keys = ngx_quic_keys_new(c->pool);
if (qc->keys == NULL) {
return NULL;
}
qc->version = pkt->version;
ngx_rbtree_init(&qc->streams.tree, &qc->streams.sentinel,
ngx_quic_rbtree_insert_stream);
for (i = 0; i < NGX_QUIC_SEND_CTX_LAST; i++) {
ngx_queue_init(&qc->send_ctx[i].frames);
ngx_queue_init(&qc->send_ctx[i].sending);
ngx_queue_init(&qc->send_ctx[i].sent);
qc->send_ctx[i].largest_pn = NGX_QUIC_UNSET_PN;
qc->send_ctx[i].largest_ack = NGX_QUIC_UNSET_PN;
qc->send_ctx[i].largest_range = NGX_QUIC_UNSET_PN;
qc->send_ctx[i].pending_ack = NGX_QUIC_UNSET_PN;
}
qc->send_ctx[0].level = ssl_encryption_initial;
qc->send_ctx[1].level = ssl_encryption_handshake;
qc->send_ctx[2].level = ssl_encryption_application;
ngx_queue_init(&qc->free_frames);
qc->avg_rtt = NGX_QUIC_INITIAL_RTT;
qc->rttvar = NGX_QUIC_INITIAL_RTT / 2;
qc->min_rtt = NGX_TIMER_INFINITE;
qc->first_rtt = NGX_TIMER_INFINITE;
/*
* qc->latest_rtt = 0
*/
qc->pto.log = c->log;
qc->pto.data = c;
qc->pto.handler = ngx_quic_pto_handler;
qc->pto.cancelable = 1;
qc->push.log = c->log;
qc->push.data = c;
qc->push.handler = ngx_quic_push_handler;
qc->push.cancelable = 1;
qc->path_validation.log = c->log;
qc->path_validation.data = c;
qc->path_validation.handler = ngx_quic_path_validation_handler;
qc->path_validation.cancelable = 1;
qc->conf = conf;
if (ngx_quic_init_transport_params(&qc->tp, conf) != NGX_OK) {
return NULL;
}
ctp = &qc->ctp;
/* defaults to be used before actual client parameters are received */
ctp->max_udp_payload_size = ngx_quic_max_udp_payload(c);
ctp->ack_delay_exponent = NGX_QUIC_DEFAULT_ACK_DELAY_EXPONENT;
ctp->max_ack_delay = NGX_QUIC_DEFAULT_MAX_ACK_DELAY;
ctp->active_connection_id_limit = 2;
ngx_queue_init(&qc->streams.uninitialized);
qc->streams.recv_max_data = qc->tp.initial_max_data;
qc->streams.recv_window = qc->streams.recv_max_data;
qc->streams.client_max_streams_uni = qc->tp.initial_max_streams_uni;
qc->streams.client_max_streams_bidi = qc->tp.initial_max_streams_bidi;
qc->congestion.window = ngx_min(10 * qc->tp.max_udp_payload_size,
ngx_max(2 * qc->tp.max_udp_payload_size,
14720));
qc->congestion.ssthresh = (size_t) -1;
qc->congestion.recovery_start = ngx_current_msec;
if (pkt->validated && pkt->retried) {
qc->tp.retry_scid.len = pkt->dcid.len;
qc->tp.retry_scid.data = ngx_pstrdup(c->pool, &pkt->dcid);
if (qc->tp.retry_scid.data == NULL) {
return NULL;
}
}
if (ngx_quic_keys_set_initial_secret(c->pool, qc->keys, &pkt->dcid)
!= NGX_OK)
{
return NULL;
}
qc->validated = pkt->validated;
if (ngx_quic_open_sockets(c, qc, pkt) != NGX_OK) {
return NULL;
}
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
"quic connection created");
return qc;
}
static ngx_int_t
ngx_quic_handle_stateless_reset(ngx_connection_t *c, ngx_quic_header_t *pkt)
{
u_char *tail, ch;
ngx_uint_t i;
ngx_queue_t *q;
ngx_quic_client_id_t *cid;
ngx_quic_connection_t *qc;
qc = ngx_quic_get_connection(c);
/* A stateless reset uses an entire UDP datagram */
if (!pkt->first) {
return NGX_DECLINED;
}
tail = pkt->raw->last - NGX_QUIC_SR_TOKEN_LEN;
for (q = ngx_queue_head(&qc->client_ids);
q != ngx_queue_sentinel(&qc->client_ids);
q = ngx_queue_next(q))
{
cid = ngx_queue_data(q, ngx_quic_client_id_t, queue);
if (cid->seqnum == 0 || !cid->used) {
/*
* No stateless reset token in initial connection id.
* Don't accept a token from an unused connection id.
*/
continue;
}
/* constant time comparison */
for (ch = 0, i = 0; i < NGX_QUIC_SR_TOKEN_LEN; i++) {
ch |= tail[i] ^ cid->sr_token[i];
}
if (ch == 0) {
return NGX_OK;
}
}
return NGX_DECLINED;
}
static void
ngx_quic_input_handler(ngx_event_t *rev)
{
ngx_int_t rc;
ngx_buf_t *b;
ngx_connection_t *c;
ngx_quic_connection_t *qc;
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, rev->log, 0, "quic input handler");
c = rev->data;
qc = ngx_quic_get_connection(c);
c->log->action = "handling quic input";
if (rev->timedout) {
ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
"quic client timed out");
ngx_quic_close_connection(c, NGX_DONE);
return;
}
if (c->close) {
qc->error_reason = "graceful shutdown";
ngx_quic_close_connection(c, NGX_OK);
return;
}
if (!rev->ready) {
if (qc->closing) {
ngx_quic_close_connection(c, NGX_OK);
} else if (qc->shutdown) {
ngx_quic_shutdown_quic(c);
}
return;
}
b = c->udp->dgram->buffer;
rc = ngx_quic_handle_datagram(c, b, NULL);
if (rc == NGX_ERROR) {
ngx_quic_close_connection(c, NGX_ERROR);
return;
}
if (rc == NGX_DONE) {
return;
}
/* rc == NGX_OK */
qc->send_timer_set = 0;
ngx_add_timer(rev, qc->tp.max_idle_timeout);
ngx_quic_connstate_dbg(c);
}
void
ngx_quic_close_connection(ngx_connection_t *c, ngx_int_t rc)
{
ngx_uint_t i;
ngx_pool_t *pool;
ngx_quic_send_ctx_t *ctx;
ngx_quic_connection_t *qc;
qc = ngx_quic_get_connection(c);
if (qc == NULL) {
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
"quic packet rejected rc:%i, cleanup connection", rc);
goto quic_done;
}
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
"quic close %s rc:%i",
qc->closing ? "resumed": "initiated", rc);
if (!qc->closing) {
/* drop packets from retransmit queues, no ack is expected */
for (i = 0; i < NGX_QUIC_SEND_CTX_LAST; i++) {
ngx_quic_free_frames(c, &qc->send_ctx[i].sent);
}
if (rc == NGX_DONE) {
/*
* RFC 9000, 10.1. Idle Timeout
*
* If a max_idle_timeout is specified by either endpoint in its
* transport parameters (Section 18.2), the connection is silently
* closed and its state is discarded when it remains idle
*/
/* this case also handles some errors from ngx_quic_run() */
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
"quic close silent drain:%d timedout:%d",
qc->draining, c->read->timedout);
} else {
/*
* RFC 9000, 10.2. Immediate Close
*
* An endpoint sends a CONNECTION_CLOSE frame (Section 19.19)
* to terminate the connection immediately.
*/
qc->error_level = c->ssl ? SSL_quic_read_level(c->ssl->connection)
: ssl_encryption_initial;
if (rc == NGX_OK) {
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
"quic close immediate drain:%d",
qc->draining);
qc->close.log = c->log;
qc->close.data = c;
qc->close.handler = ngx_quic_close_timer_handler;
qc->close.cancelable = 1;
ctx = ngx_quic_get_send_ctx(qc, qc->error_level);
ngx_add_timer(&qc->close, 3 * ngx_quic_pto(c, ctx));
qc->error = NGX_QUIC_ERR_NO_ERROR;
} else {
if (qc->error == 0 && !qc->error_app) {
qc->error = NGX_QUIC_ERR_INTERNAL_ERROR;
}
ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0,
"quic close immediate due to %serror: %ui %s",
qc->error_app ? "app " : "", qc->error,
qc->error_reason ? qc->error_reason : "");
}
(void) ngx_quic_send_cc(c);
if (qc->error_level == ssl_encryption_handshake) {
/* for clients that might not have handshake keys */
qc->error_level = ssl_encryption_initial;
(void) ngx_quic_send_cc(c);
}
}
qc->closing = 1;
}
if (rc == NGX_ERROR && qc->close.timer_set) {
/* do not wait for timer in case of fatal error */
ngx_del_timer(&qc->close);
}
if (ngx_quic_close_streams(c, qc) == NGX_AGAIN) {
return;
}
if (qc->push.timer_set) {
ngx_del_timer(&qc->push);
}
if (qc->pto.timer_set) {
ngx_del_timer(&qc->pto);
}
if (qc->path_validation.timer_set) {
ngx_del_timer(&qc->path_validation);
}
if (qc->push.posted) {
ngx_delete_posted_event(&qc->push);
}
if (qc->close.timer_set) {
return;
}
ngx_quic_close_sockets(c);
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0, "quic close completed");
/* may be tested from SSL callback during SSL shutdown */
c->udp = NULL;
quic_done:
if (c->ssl) {
(void) ngx_ssl_shutdown(c);
}
if (c->read->timer_set) {
ngx_del_timer(c->read);
}
#if (NGX_STAT_STUB)
(void) ngx_atomic_fetch_add(ngx_stat_active, -1);
#endif
c->destroyed = 1;
pool = c->pool;
ngx_close_connection(c);
ngx_destroy_pool(pool);
}
void
ngx_quic_finalize_connection(ngx_connection_t *c, ngx_uint_t err,
const char *reason)
{
ngx_quic_connection_t *qc;
qc = ngx_quic_get_connection(c);
qc->error = err;
qc->error_reason = reason;
qc->error_app = 1;
qc->error_ftype = 0;
ngx_quic_close_connection(c, NGX_ERROR);
}
void
ngx_quic_shutdown_connection(ngx_connection_t *c, ngx_uint_t err,
const char *reason)
{
ngx_quic_connection_t *qc;
qc = ngx_quic_get_connection(c);
qc->shutdown = 1;
qc->shutdown_code = err;
qc->shutdown_reason = reason;
ngx_quic_shutdown_quic(c);
}
static void
ngx_quic_close_timer_handler(ngx_event_t *ev)
{
ngx_connection_t *c;
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ev->log, 0, "quic close timer");
c = ev->data;
ngx_quic_close_connection(c, NGX_DONE);
}
static ngx_int_t
ngx_quic_handle_datagram(ngx_connection_t *c, ngx_buf_t *b,
ngx_quic_conf_t *conf)
{
size_t size;
u_char *p, *start;
ngx_int_t rc;
ngx_uint_t good;
ngx_quic_path_t *path;
ngx_quic_header_t pkt;
ngx_quic_connection_t *qc;
good = 0;
path = NULL;
size = b->last - b->pos;
p = start = b->pos;
while (p < b->last) {
ngx_memzero(&pkt, sizeof(ngx_quic_header_t));
pkt.raw = b;
pkt.data = p;
pkt.len = b->last - p;
pkt.log = c->log;
pkt.first = (p == start) ? 1 : 0;
pkt.path = path;
pkt.flags = p[0];
pkt.raw->pos++;
rc = ngx_quic_handle_packet(c, conf, &pkt);
#if (NGX_DEBUG)
if (pkt.parsed) {
ngx_log_debug5(NGX_LOG_DEBUG_EVENT, c->log, 0,
"quic packet done rc:%i level:%s"
" decr:%d pn:%L perr:%ui",
rc, ngx_quic_level_name(pkt.level),
pkt.decrypted, pkt.pn, pkt.error);
} else {
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
"quic packet done rc:%i parse failed", rc);
}
#endif
if (rc == NGX_ERROR || rc == NGX_DONE) {
return rc;
}
if (rc == NGX_OK) {
good = 1;
}
path = pkt.path; /* preserve packet path from 1st packet */
/* NGX_OK || NGX_DECLINED */
/*
* we get NGX_DECLINED when there are no keys [yet] available
* to decrypt packet.
* Instead of queueing it, we ignore it and rely on the sender's
* retransmission:
*
* RFC 9000, 12.2. Coalescing Packets
*
* For example, if decryption fails (because the keys are
* not available or for any other reason), the receiver MAY either
* discard or buffer the packet for later processing and MUST
* attempt to process the remaining packets.
*
* We also skip packets that don't match connection state
* or cannot be parsed properly.
*/
/* b->pos is at header end, adjust by actual packet length */
b->pos = pkt.data + pkt.len;
p = b->pos;
}
if (!good) {
return NGX_DONE;
}
qc = ngx_quic_get_connection(c);
if (qc) {
qc->received += size;
if ((uint64_t) (c->sent + qc->received) / 8 >
(qc->streams.sent + qc->streams.recv_last) + 1048576)
{
ngx_log_error(NGX_LOG_INFO, c->log, 0, "quic flood detected");
qc->error = NGX_QUIC_ERR_NO_ERROR;
qc->error_reason = "QUIC flood detected";
return NGX_ERROR;
}
}
return NGX_OK;
}
static ngx_int_t
ngx_quic_handle_packet(ngx_connection_t *c, ngx_quic_conf_t *conf,
ngx_quic_header_t *pkt)
{
ngx_int_t rc;
ngx_quic_connection_t *qc;
c->log->action = "parsing quic packet";
rc = ngx_quic_parse_packet(pkt);
if (rc == NGX_ERROR) {
return NGX_DECLINED;
}
pkt->parsed = 1;
c->log->action = "handling quic packet";
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
"quic packet rx dcid len:%uz %xV",
pkt->dcid.len, &pkt->dcid);
#if (NGX_DEBUG)
if (pkt->level != ssl_encryption_application) {
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
"quic packet rx scid len:%uz %xV",
pkt->scid.len, &pkt->scid);
}
if (pkt->level == ssl_encryption_initial) {
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
"quic address validation token len:%uz %xV",
pkt->token.len, &pkt->token);
}
#endif
qc = ngx_quic_get_connection(c);
if (qc) {
if (rc == NGX_ABORT) {
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"quic unsupported version: 0x%xD", pkt->version);
return NGX_DECLINED;
}
if (pkt->level != ssl_encryption_application) {
if (pkt->version != qc->version) {
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"quic version mismatch: 0x%xD", pkt->version);
return NGX_DECLINED;
}
if (pkt->first) {
if (ngx_cmp_sockaddr(c->udp->dgram->sockaddr,
c->udp->dgram->socklen,
qc->path->sockaddr, qc->path->socklen, 1)
!= NGX_OK)
{
/* packet comes from unknown path, possibly migration */
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
"quic too early migration attempt");
return NGX_DONE;
}
}
if (ngx_quic_check_csid(qc, pkt) != NGX_OK) {
return NGX_DECLINED;
}
}
rc = ngx_quic_handle_payload(c, pkt);
if (rc == NGX_DECLINED && pkt->level == ssl_encryption_application) {
if (ngx_quic_handle_stateless_reset(c, pkt) == NGX_OK) {
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"quic stateless reset packet detected");
qc->draining = 1;
ngx_quic_close_connection(c, NGX_OK);
return NGX_OK;
}
}
return rc;
}
/* packet does not belong to a connection */
if (rc == NGX_ABORT) {
return ngx_quic_negotiate_version(c, pkt);
}
if (pkt->level == ssl_encryption_application) {
return ngx_quic_send_stateless_reset(c, conf, pkt);
}
if (pkt->level != ssl_encryption_initial) {
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
"quic expected initial, got handshake");
return NGX_ERROR;
}
c->log->action = "handling initial packet";
if (pkt->dcid.len < NGX_QUIC_CID_LEN_MIN) {
/* RFC 9000, 7.2. Negotiating Connection IDs */
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"quic too short dcid in initial"
" packet: len:%i", pkt->dcid.len);
return NGX_ERROR;
}
/* process retry and initialize connection IDs */
if (pkt->token.len) {
rc = ngx_quic_validate_token(c, conf->av_token_key, pkt);
if (rc == NGX_ERROR) {
/* internal error */
return NGX_ERROR;
} else if (rc == NGX_ABORT) {
/* token cannot be decrypted */
return ngx_quic_send_early_cc(c, pkt,
NGX_QUIC_ERR_INVALID_TOKEN,
"cannot decrypt token");
} else if (rc == NGX_DECLINED) {
/* token is invalid */
if (pkt->retried) {
/* invalid address validation token */
return ngx_quic_send_early_cc(c, pkt,
NGX_QUIC_ERR_INVALID_TOKEN,
"invalid address validation token");
} else if (conf->retry) {
/* invalid NEW_TOKEN */
return ngx_quic_send_retry(c, conf, pkt);
}
}
/* NGX_OK */
} else if (conf->retry) {
return ngx_quic_send_retry(c, conf, pkt);
} else {
pkt->odcid = pkt->dcid;
}
if (ngx_terminate || ngx_exiting) {
if (conf->retry) {
return ngx_quic_send_retry(c, conf, pkt);
}
return NGX_ERROR;
}
c->log->action = "creating quic connection";
qc = ngx_quic_new_connection(c, conf, pkt);
if (qc == NULL) {
return NGX_ERROR;
}
return ngx_quic_handle_payload(c, pkt);
}
static ngx_int_t
ngx_quic_handle_payload(ngx_connection_t *c, ngx_quic_header_t *pkt)
{
ngx_int_t rc;
ngx_quic_send_ctx_t *ctx;
ngx_quic_connection_t *qc;
static u_char buf[NGX_QUIC_MAX_UDP_PAYLOAD_SIZE];
qc = ngx_quic_get_connection(c);
qc->error = 0;
qc->error_reason = 0;
c->log->action = "decrypting packet";
if (!ngx_quic_keys_available(qc->keys, pkt->level)) {
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"quic no %s keys, ignoring packet",
ngx_quic_level_name(pkt->level));
return NGX_DECLINED;
}
#if !defined (OPENSSL_IS_BORINGSSL)
/* OpenSSL provides read keys for an application level before it's ready */
if (pkt->level == ssl_encryption_application
&& SSL_quic_read_level(c->ssl->connection)
< ssl_encryption_application)
{
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"quic no %s keys ready, ignoring packet",
ngx_quic_level_name(pkt->level));
return NGX_DECLINED;
}
#endif
pkt->keys = qc->keys;
pkt->key_phase = qc->key_phase;
pkt->plaintext = buf;
ctx = ngx_quic_get_send_ctx(qc, pkt->level);
rc = ngx_quic_decrypt(pkt, &ctx->largest_pn);
if (rc != NGX_OK) {
qc->error = pkt->error;
qc->error_reason = "failed to decrypt packet";
return rc;
}
pkt->decrypted = 1;
c->log->action = "handling decrypted packet";
if (pkt->path == NULL) {
rc = ngx_quic_set_path(c, pkt);
if (rc != NGX_OK) {
return rc;
}
}
if (c->ssl == NULL) {
if (ngx_quic_init_connection(c) != NGX_OK) {
return NGX_ERROR;
}
}
if (pkt->level == ssl_encryption_handshake) {
/*
* RFC 9001, 4.9.1. Discarding Initial Keys
*
* The successful use of Handshake packets indicates
* that no more Initial packets need to be exchanged
*/
ngx_quic_discard_ctx(c, ssl_encryption_initial);
if (!qc->path->validated) {
qc->path->validated = 1;
qc->path->limited = 0;
ngx_quic_path_dbg(c, "in handshake", qc->path);
ngx_post_event(&qc->push, &ngx_posted_events);
}
}
if (qc->closing) {
/*
* RFC 9000, 10.2. Immediate Close
*
* ... delayed or reordered packets are properly discarded.
*
* In the closing state, an endpoint retains only enough information
* to generate a packet containing a CONNECTION_CLOSE frame and to
* identify packets as belonging to the connection.
*/
qc->error_level = pkt->level;
qc->error = NGX_QUIC_ERR_NO_ERROR;
qc->error_reason = "connection is closing, packet discarded";
qc->error_ftype = 0;
qc->error_app = 0;
return ngx_quic_send_cc(c);
}
pkt->received = ngx_current_msec;
c->log->action = "handling payload";
if (pkt->level != ssl_encryption_application) {
return ngx_quic_handle_frames(c, pkt);
}
if (!pkt->key_update) {
return ngx_quic_handle_frames(c, pkt);
}
/* switch keys and generate next on Key Phase change */
qc->key_phase ^= 1;
ngx_quic_keys_switch(c, qc->keys);
rc = ngx_quic_handle_frames(c, pkt);
if (rc != NGX_OK) {
return rc;
}
return ngx_quic_keys_update(c, qc->keys);
}
void
ngx_quic_discard_ctx(ngx_connection_t *c, enum ssl_encryption_level_t level)
{
ngx_queue_t *q;
ngx_quic_frame_t *f;
ngx_quic_socket_t *qsock;
ngx_quic_send_ctx_t *ctx;
ngx_quic_connection_t *qc;
qc = ngx_quic_get_connection(c);
if (!ngx_quic_keys_available(qc->keys, level)) {
return;
}
ngx_quic_keys_discard(qc->keys, level);
qc->pto_count = 0;
ctx = ngx_quic_get_send_ctx(qc, level);
ngx_quic_free_chain(c, ctx->crypto);
while (!ngx_queue_empty(&ctx->sent)) {
q = ngx_queue_head(&ctx->sent);
ngx_queue_remove(q);
f = ngx_queue_data(q, ngx_quic_frame_t, queue);
ngx_quic_congestion_ack(c, f);
ngx_quic_free_frame(c, f);
}
while (!ngx_queue_empty(&ctx->frames)) {
q = ngx_queue_head(&ctx->frames);
ngx_queue_remove(q);
f = ngx_queue_data(q, ngx_quic_frame_t, queue);
ngx_quic_congestion_ack(c, f);
ngx_quic_free_frame(c, f);
}
if (level == ssl_encryption_initial) {
/* close temporary listener with odcid */
qsock = ngx_quic_find_socket(c, NGX_QUIC_UNSET_PN);
if (qsock) {
ngx_quic_close_socket(c, qsock);
}
}
ctx->send_ack = 0;
ngx_quic_set_lost_timer(c);
}
static ngx_int_t
ngx_quic_check_csid(ngx_quic_connection_t *qc, ngx_quic_header_t *pkt)
{
ngx_queue_t *q;
ngx_quic_client_id_t *cid;
for (q = ngx_queue_head(&qc->client_ids);
q != ngx_queue_sentinel(&qc->client_ids);
q = ngx_queue_next(q))
{
cid = ngx_queue_data(q, ngx_quic_client_id_t, queue);
if (pkt->scid.len == cid->len
&& ngx_memcmp(pkt->scid.data, cid->id, cid->len) == 0)
{
return NGX_OK;
}
}
ngx_log_error(NGX_LOG_INFO, pkt->log, 0, "quic unexpected quic scid");
return NGX_ERROR;
}
static ngx_int_t
ngx_quic_handle_frames(ngx_connection_t *c, ngx_quic_header_t *pkt)
{
u_char *end, *p;
ssize_t len;
ngx_buf_t buf;
ngx_uint_t do_close, nonprobing;
ngx_chain_t chain;
ngx_quic_frame_t frame;
ngx_quic_connection_t *qc;
qc = ngx_quic_get_connection(c);
p = pkt->payload.data;
end = p + pkt->payload.len;
do_close = 0;
nonprobing = 0;
while (p < end) {
c->log->action = "parsing frames";
ngx_memzero(&frame, sizeof(ngx_quic_frame_t));
ngx_memzero(&buf, sizeof(ngx_buf_t));
buf.temporary = 1;
chain.buf = &buf;
chain.next = NULL;
frame.data = &chain;
len = ngx_quic_parse_frame(pkt, p, end, &frame);
if (len < 0) {
qc->error = pkt->error;
return NGX_ERROR;
}
ngx_quic_log_frame(c->log, &frame, 0);
c->log->action = "handling frames";
p += len;
switch (frame.type) {
/* probing frames */
case NGX_QUIC_FT_PADDING:
case NGX_QUIC_FT_PATH_CHALLENGE:
case NGX_QUIC_FT_PATH_RESPONSE:
case NGX_QUIC_FT_NEW_CONNECTION_ID:
break;
/* non-probing frames */
default:
nonprobing = 1;
break;
}
switch (frame.type) {
case NGX_QUIC_FT_ACK:
if (ngx_quic_handle_ack_frame(c, pkt, &frame) != NGX_OK) {
return NGX_ERROR;
}
continue;
case NGX_QUIC_FT_PADDING:
/* no action required */
continue;
case NGX_QUIC_FT_CONNECTION_CLOSE:
case NGX_QUIC_FT_CONNECTION_CLOSE_APP:
do_close = 1;
continue;
}
/* got there with ack-eliciting packet */
pkt->need_ack = 1;
switch (frame.type) {
case NGX_QUIC_FT_CRYPTO:
if (ngx_quic_handle_crypto_frame(c, pkt, &frame) != NGX_OK) {
return NGX_ERROR;
}
break;
case NGX_QUIC_FT_PING:
break;
case NGX_QUIC_FT_STREAM:
if (ngx_quic_handle_stream_frame(c, pkt, &frame) != NGX_OK) {
return NGX_ERROR;
}
break;
case NGX_QUIC_FT_MAX_DATA:
if (ngx_quic_handle_max_data_frame(c, &frame.u.max_data) != NGX_OK)
{
return NGX_ERROR;
}
break;
case NGX_QUIC_FT_STREAMS_BLOCKED:
case NGX_QUIC_FT_STREAMS_BLOCKED2:
if (ngx_quic_handle_streams_blocked_frame(c, pkt,
&frame.u.streams_blocked)
!= NGX_OK)
{
return NGX_ERROR;
}
break;
case NGX_QUIC_FT_DATA_BLOCKED:
if (ngx_quic_handle_data_blocked_frame(c, pkt,
&frame.u.data_blocked)
!= NGX_OK)
{
return NGX_ERROR;
}
break;
case NGX_QUIC_FT_STREAM_DATA_BLOCKED:
if (ngx_quic_handle_stream_data_blocked_frame(c, pkt,
&frame.u.stream_data_blocked)
!= NGX_OK)
{
return NGX_ERROR;
}
break;
case NGX_QUIC_FT_MAX_STREAM_DATA:
if (ngx_quic_handle_max_stream_data_frame(c, pkt,
&frame.u.max_stream_data)
!= NGX_OK)
{
return NGX_ERROR;
}
break;
case NGX_QUIC_FT_RESET_STREAM:
if (ngx_quic_handle_reset_stream_frame(c, pkt,
&frame.u.reset_stream)
!= NGX_OK)
{
return NGX_ERROR;
}
break;
case NGX_QUIC_FT_STOP_SENDING:
if (ngx_quic_handle_stop_sending_frame(c, pkt,
&frame.u.stop_sending)
!= NGX_OK)
{
return NGX_ERROR;
}
break;
case NGX_QUIC_FT_MAX_STREAMS:
case NGX_QUIC_FT_MAX_STREAMS2:
if (ngx_quic_handle_max_streams_frame(c, pkt, &frame.u.max_streams)
!= NGX_OK)
{
return NGX_ERROR;
}
break;
case NGX_QUIC_FT_PATH_CHALLENGE:
if (ngx_quic_handle_path_challenge_frame(c, pkt,
&frame.u.path_challenge)
!= NGX_OK)
{
return NGX_ERROR;
}
break;
case NGX_QUIC_FT_PATH_RESPONSE:
if (ngx_quic_handle_path_response_frame(c, &frame.u.path_response)
!= NGX_OK)
{
return NGX_ERROR;
}
break;
case NGX_QUIC_FT_NEW_CONNECTION_ID:
if (ngx_quic_handle_new_connection_id_frame(c, &frame.u.ncid)
!= NGX_OK)
{
return NGX_ERROR;
}
break;
case NGX_QUIC_FT_RETIRE_CONNECTION_ID:
if (ngx_quic_handle_retire_connection_id_frame(c,
&frame.u.retire_cid)
!= NGX_OK)
{
return NGX_ERROR;
}
break;
default:
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
"quic missing frame handler");
return NGX_ERROR;
}
}
if (p != end) {
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"quic trailing garbage in payload:%ui bytes", end - p);
qc->error = NGX_QUIC_ERR_FRAME_ENCODING_ERROR;
return NGX_ERROR;
}
if (do_close) {
qc->draining = 1;
ngx_quic_close_connection(c, NGX_OK);
}
if (pkt->path != qc->path && nonprobing) {
/*
* RFC 9000, 9.2. Initiating Connection Migration
*
* An endpoint can migrate a connection to a new local
* address by sending packets containing non-probing frames
* from that address.
*/
if (ngx_quic_handle_migration(c, pkt) != NGX_OK) {
return NGX_ERROR;
}
}
if (ngx_quic_ack_packet(c, pkt) != NGX_OK) {
return NGX_ERROR;
}
return NGX_OK;
}
static void
ngx_quic_push_handler(ngx_event_t *ev)
{
ngx_connection_t *c;
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ev->log, 0, "quic push handler");
c = ev->data;
if (ngx_quic_output(c) != NGX_OK) {
ngx_quic_close_connection(c, NGX_ERROR);
return;
}
ngx_quic_connstate_dbg(c);
}
void
ngx_quic_shutdown_quic(ngx_connection_t *c)
{
ngx_rbtree_t *tree;
ngx_rbtree_node_t *node;
ngx_quic_stream_t *qs;
ngx_quic_connection_t *qc;
qc = ngx_quic_get_connection(c);
if (qc->closing) {
return;
}
tree = &qc->streams.tree;
if (tree->root != tree->sentinel) {
for (node = ngx_rbtree_min(tree->root, tree->sentinel);
node;
node = ngx_rbtree_next(tree, node))
{
qs = (ngx_quic_stream_t *) node;
if (!qs->cancelable) {
return;
}
}
}
ngx_quic_finalize_connection(c, qc->shutdown_code, qc->shutdown_reason);
}
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