Mercurial > hg > nginx
view src/event/quic/ngx_event_quic_socket.c @ 9189:fcec773dd249
QUIC: avoid partial expansion of PATH_CHALLENGE/PATH_RESPONSE.
By default packets with these frames are expanded to 1200 bytes. Previously,
if anti-amplification limit did not allow this expansion, it was limited to
whatever size was allowed. However RFC 9000 clearly states no partial
expansion should happen in both cases.
Section 8.2.1. Initiating Path Validation:
An endpoint MUST expand datagrams that contain a PATH_CHALLENGE frame
to at least the smallest allowed maximum datagram size of 1200 bytes,
unless the anti-amplification limit for the path does not permit
sending a datagram of this size.
Section 8.2.2. Path Validation Responses:
An endpoint MUST expand datagrams that contain a PATH_RESPONSE frame
to at least the smallest allowed maximum datagram size of 1200 bytes.
...
However, an endpoint MUST NOT expand the datagram containing the
PATH_RESPONSE if the resulting data exceeds the anti-amplification limit.
author | Roman Arutyunyan <arut@nginx.com> |
---|---|
date | Wed, 29 Nov 2023 18:13:25 +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; }