Mercurial > hg > nginx
view src/event/quic/ngx_event_quic_socket.c @ 9196:6c8595b77e66
QUIC: path aware in-flight bytes accounting.
On-packet acknowledgement is made path aware, as per RFC 9000, Section 9.4:
Packets sent on the old path MUST NOT contribute to congestion control
or RTT estimation for the new path.
To make this possible in a single congestion control context, the first packet
to be sent after the new path has been validated, which includes resetting the
congestion controller and RTT estimator, is now remembered in the connection.
Packets sent previously, such as on the old path, are not taken into account.
Note that although the packet number is saved per-connection, the added checks
affect application level packets only. For non-application level packets,
which are only processed prior to the handshake is complete, the remembered
packet number remains set to zero.
author | Sergey Kandaurov <pluknet@nginx.com> |
---|---|
date | Tue, 12 Dec 2023 20:21:12 +0400 |
parents | 8f7e6d8c061e |
children |
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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> ngx_int_t ngx_quic_open_sockets(ngx_connection_t *c, ngx_quic_connection_t *qc, ngx_quic_header_t *pkt) { ngx_quic_socket_t *qsock, *tmp; ngx_quic_client_id_t *cid; /* * qc->path = NULL * * qc->nclient_ids = 0 * qc->nsockets = 0 * qc->max_retired_seqnum = 0 * qc->client_seqnum = 0 */ ngx_queue_init(&qc->sockets); ngx_queue_init(&qc->free_sockets); ngx_queue_init(&qc->paths); ngx_queue_init(&qc->free_paths); ngx_queue_init(&qc->client_ids); ngx_queue_init(&qc->free_client_ids); qc->tp.original_dcid.len = pkt->odcid.len; qc->tp.original_dcid.data = ngx_pstrdup(c->pool, &pkt->odcid); if (qc->tp.original_dcid.data == NULL) { return NGX_ERROR; } /* socket to use for further processing (id auto-generated) */ qsock = ngx_quic_create_socket(c, qc); if (qsock == NULL) { return NGX_ERROR; } /* socket is listening at new server id */ if (ngx_quic_listen(c, qc, qsock) != NGX_OK) { return NGX_ERROR; } qsock->used = 1; qc->tp.initial_scid.len = qsock->sid.len; qc->tp.initial_scid.data = ngx_pnalloc(c->pool, qsock->sid.len); if (qc->tp.initial_scid.data == NULL) { goto failed; } ngx_memcpy(qc->tp.initial_scid.data, qsock->sid.id, qsock->sid.len); /* for all packets except first, this is set at udp layer */ c->udp = &qsock->udp; /* ngx_quic_get_connection(c) macro is now usable */ /* we have a client identified by scid */ cid = ngx_quic_create_client_id(c, &pkt->scid, 0, NULL); if (cid == NULL) { goto failed; } /* path of the first packet is our initial active path */ qc->path = ngx_quic_new_path(c, c->sockaddr, c->socklen, cid); if (qc->path == NULL) { goto failed; } qc->path->tag = NGX_QUIC_PATH_ACTIVE; if (pkt->validated) { qc->path->validated = 1; } ngx_quic_path_dbg(c, "set active", qc->path); tmp = ngx_pcalloc(c->pool, sizeof(ngx_quic_socket_t)); if (tmp == NULL) { goto failed; } tmp->sid.seqnum = NGX_QUIC_UNSET_PN; /* temporary socket */ ngx_memcpy(tmp->sid.id, pkt->dcid.data, pkt->dcid.len); tmp->sid.len = pkt->dcid.len; if (ngx_quic_listen(c, qc, tmp) != NGX_OK) { goto failed; } return NGX_OK; failed: ngx_rbtree_delete(&c->listening->rbtree, &qsock->udp.node); c->udp = NULL; return NGX_ERROR; } ngx_quic_socket_t * ngx_quic_create_socket(ngx_connection_t *c, ngx_quic_connection_t *qc) { ngx_queue_t *q; ngx_quic_socket_t *sock; if (!ngx_queue_empty(&qc->free_sockets)) { q = ngx_queue_head(&qc->free_sockets); sock = ngx_queue_data(q, ngx_quic_socket_t, queue); ngx_queue_remove(&sock->queue); ngx_memzero(sock, sizeof(ngx_quic_socket_t)); } else { sock = ngx_pcalloc(c->pool, sizeof(ngx_quic_socket_t)); if (sock == NULL) { return NULL; } } sock->sid.len = NGX_QUIC_SERVER_CID_LEN; if (ngx_quic_create_server_id(c, sock->sid.id) != NGX_OK) { return NULL; } sock->sid.seqnum = qc->server_seqnum++; return sock; } void ngx_quic_close_socket(ngx_connection_t *c, ngx_quic_socket_t *qsock) { ngx_quic_connection_t *qc; qc = ngx_quic_get_connection(c); ngx_queue_remove(&qsock->queue); ngx_queue_insert_head(&qc->free_sockets, &qsock->queue); ngx_rbtree_delete(&c->listening->rbtree, &qsock->udp.node); qc->nsockets--; ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, "quic socket seq:%L closed nsock:%ui", (int64_t) qsock->sid.seqnum, qc->nsockets); } ngx_int_t ngx_quic_listen(ngx_connection_t *c, ngx_quic_connection_t *qc, ngx_quic_socket_t *qsock) { ngx_str_t id; ngx_quic_server_id_t *sid; sid = &qsock->sid; id.data = sid->id; id.len = sid->len; qsock->udp.connection = c; qsock->udp.node.key = ngx_crc32_long(id.data, id.len); qsock->udp.key = id; ngx_rbtree_insert(&c->listening->rbtree, &qsock->udp.node); ngx_queue_insert_tail(&qc->sockets, &qsock->queue); qc->nsockets++; qsock->quic = qc; ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0, "quic socket seq:%L listening at sid:%xV nsock:%ui", (int64_t) sid->seqnum, &id, qc->nsockets); return NGX_OK; } void ngx_quic_close_sockets(ngx_connection_t *c) { ngx_queue_t *q; ngx_quic_socket_t *qsock; ngx_quic_connection_t *qc; qc = ngx_quic_get_connection(c); while (!ngx_queue_empty(&qc->sockets)) { q = ngx_queue_head(&qc->sockets); qsock = ngx_queue_data(q, ngx_quic_socket_t, queue); ngx_quic_close_socket(c, qsock); } } ngx_quic_socket_t * ngx_quic_find_socket(ngx_connection_t *c, uint64_t seqnum) { ngx_queue_t *q; ngx_quic_socket_t *qsock; ngx_quic_connection_t *qc; qc = ngx_quic_get_connection(c); for (q = ngx_queue_head(&qc->sockets); q != ngx_queue_sentinel(&qc->sockets); q = ngx_queue_next(q)) { qsock = ngx_queue_data(q, ngx_quic_socket_t, queue); if (qsock->sid.seqnum == seqnum) { return qsock; } } return NULL; }