Mercurial > hg > nginx
view src/event/quic/ngx_event_quic.c @ 8797:4715f3e669f1 quic
QUIC: updated specification references.
This includes updating citations and further clarification.
author | Sergey Kandaurov <pluknet@nginx.com> |
---|---|
date | Wed, 16 Jun 2021 11:55:12 +0300 |
parents | 80d396fd8ee8 |
children | f8ad3dd142ad |
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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_process_stateless_reset(ngx_connection_t *c, ngx_quic_header_t *pkt); static void ngx_quic_input_handler(ngx_event_t *rev); static ngx_int_t ngx_quic_close_quic(ngx_connection_t *c, ngx_int_t rc); static void ngx_quic_close_timer_handler(ngx_event_t *ev); static ngx_int_t ngx_quic_input(ngx_connection_t *c, ngx_buf_t *b, ngx_quic_conf_t *conf); static ngx_int_t ngx_quic_process_packet(ngx_connection_t *c, ngx_quic_conf_t *conf, ngx_quic_header_t *pkt); static ngx_int_t ngx_quic_process_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->socket->cid->id; scid.len = qc->socket->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_input(c, c->buffer, conf); if (rc != NGX_OK) { ngx_quic_close_connection(c, rc == NGX_DECLINED ? NGX_DONE : NGX_ERROR); return; } qc = ngx_quic_get_connection(c); if (qc == NULL) { ngx_quic_close_connection(c, NGX_DONE); return; } 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].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; qc->tp = conf->tp; 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; 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, qc->version) != 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_process_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->raw->start != pkt->data) { 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) { /* no stateless reset token in initial 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); } return; } b = c->udp->dgram->buffer; rc = ngx_quic_input(c, b, NULL); if (rc == NGX_ERROR) { ngx_quic_close_connection(c, NGX_ERROR); return; } if (rc == NGX_DECLINED) { 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_pool_t *pool; ngx_quic_connection_t *qc; ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "quic ngx_quic_close_connection rc:%i", rc); qc = ngx_quic_get_connection(c); if (qc == NULL) { if (rc == NGX_ERROR) { ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0, "quic close connection early error"); } } else if (ngx_quic_close_quic(c, rc) == NGX_AGAIN) { return; } 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); } static ngx_int_t ngx_quic_close_quic(ngx_connection_t *c, ngx_int_t rc) { ngx_uint_t i; ngx_quic_send_ctx_t *ctx; ngx_quic_connection_t *qc; qc = ngx_quic_get_connection(c); 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 */ ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "quic closing %s connection", qc->draining ? "drained" : "idle"); } 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 immediate close 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 immediate close due to %s error: %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 NGX_AGAIN; } 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_AGAIN; } ngx_quic_close_sockets(c); ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0, "quic part of connection is terminated"); /* may be tested from SSL callback during SSL shutdown */ c->udp = NULL; return NGX_OK; } 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_input(ngx_connection_t *c, ngx_buf_t *b, ngx_quic_conf_t *conf) { u_char *p; ngx_int_t rc; ngx_uint_t good; ngx_quic_header_t pkt; good = 0; p = 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.flags = p[0]; pkt.raw->pos++; rc = ngx_quic_process_packet(c, conf, &pkt); #if (NGX_DEBUG) if (pkt.parsed) { ngx_log_debug5(NGX_LOG_DEBUG_EVENT, c->log, 0, "quic packet %s done decr:%d pn:%L perr:%ui rc:%i", ngx_quic_level_name(pkt.level), pkt.decrypted, pkt.pn, pkt.error, rc); } else { ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "quic packet done parse failed rc:%i", rc); } #endif if (rc == NGX_ERROR) { return NGX_ERROR; } if (rc == NGX_DONE) { /* stop further processing */ return NGX_DECLINED; } if (rc == NGX_OK) { good = 1; } /* 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; /* firefox workaround: skip zero padding at the end of quic packet */ while (b->pos < b->last && *(b->pos) == 0) { b->pos++; } p = b->pos; } return good ? NGX_OK : NGX_DECLINED; } static ngx_int_t ngx_quic_process_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_DECLINED || rc == NGX_ERROR) { return rc; } pkt->parsed = 1; c->log->action = "processing 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; } rc = ngx_quic_check_migration(c, pkt); if (rc != NGX_OK) { return rc; } 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 (ngx_quic_check_csid(qc, pkt) != NGX_OK) { return NGX_DECLINED; } } else { if (ngx_quic_process_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 ngx_quic_process_payload(c, pkt); } /* 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) { return NGX_ERROR; } c->log->action = "processing 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_process_payload(c, pkt); } static ngx_int_t ngx_quic_process_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; } 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; if (ngx_quic_update_paths(c, pkt) != NGX_OK) { return NGX_ERROR; } 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->socket->path->state != NGX_QUIC_PATH_VALIDATED) { qc->socket->path->state = NGX_QUIC_PATH_VALIDATED; 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_bufs(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_socket_t *qsock; 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_STREAM0: case NGX_QUIC_FT_STREAM1: case NGX_QUIC_FT_STREAM2: case NGX_QUIC_FT_STREAM3: case NGX_QUIC_FT_STREAM4: case NGX_QUIC_FT_STREAM5: case NGX_QUIC_FT_STREAM6: case NGX_QUIC_FT_STREAM7: 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_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, &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); } qsock = ngx_quic_get_socket(c); if (qsock != qc->socket) { if (qsock->path != qc->socket->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; } } /* * else: packet arrived via non-default socket; * no reason to change active path */ } 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 timer"); 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); } uint32_t ngx_quic_version(ngx_connection_t *c) { uint32_t version; ngx_quic_connection_t *qc; qc = ngx_quic_get_connection(c); version = qc->version; return (version & 0xff000000) == 0xff000000 ? version & 0xff : version; }