Mercurial > hg > nginx
diff src/event/quic/ngx_event_quic_connid.c @ 8748:e0cb1e58ca13 quic
QUIC: separate files for connection id related processing.
author | Vladimir Homutov <vl@nginx.com> |
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date | Tue, 13 Apr 2021 14:37:41 +0300 |
parents | |
children | 4117aa7fa38e |
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new file mode 100644 --- /dev/null +++ b/src/event/quic/ngx_event_quic_connid.c @@ -0,0 +1,532 @@ + +/* + * Copyright (C) Nginx, Inc. + */ + + +#include <ngx_config.h> +#include <ngx_core.h> +#include <ngx_event.h> +#include <ngx_event_quic_connection.h> + + +#define NGX_QUIC_MAX_SERVER_IDS 8 + + +static ngx_int_t ngx_quic_create_server_id(ngx_connection_t *c, u_char *id); +#if (NGX_QUIC_BPF) +static ngx_int_t ngx_quic_bpf_attach_id(ngx_connection_t *c, u_char *id); +#endif +static ngx_int_t ngx_quic_retire_connection_id(ngx_connection_t *c, + enum ssl_encryption_level_t level, uint64_t seqnum); +static ngx_quic_server_id_t *ngx_quic_insert_server_id(ngx_connection_t *c, + ngx_quic_connection_t *qc, ngx_str_t *id); +static ngx_quic_client_id_t *ngx_quic_alloc_client_id(ngx_connection_t *c, + ngx_quic_connection_t *qc); +static ngx_quic_server_id_t *ngx_quic_alloc_server_id(ngx_connection_t *c, + ngx_quic_connection_t *qc); + + +ngx_int_t +ngx_quic_setup_connection_ids(ngx_connection_t *c, ngx_quic_connection_t *qc, + ngx_quic_header_t *pkt) +{ + ngx_quic_server_id_t *sid, *osid; + ngx_quic_client_id_t *cid; + + /* + * qc->nclient_ids = 0 + * qc->nserver_ids = 0 + * qc->max_retired_seqnum = 0 + */ + + ngx_queue_init(&qc->client_ids); + ngx_queue_init(&qc->server_ids); + ngx_queue_init(&qc->free_client_ids); + ngx_queue_init(&qc->free_server_ids); + + qc->odcid.len = pkt->odcid.len; + qc->odcid.data = ngx_pstrdup(c->pool, &pkt->odcid); + if (qc->odcid.data == NULL) { + return NGX_ERROR; + } + + qc->tp.original_dcid = qc->odcid; + + qc->scid.len = pkt->scid.len; + qc->scid.data = ngx_pstrdup(c->pool, &pkt->scid); + if (qc->scid.data == NULL) { + return NGX_ERROR; + } + + qc->dcid.len = NGX_QUIC_SERVER_CID_LEN; + qc->dcid.data = ngx_pnalloc(c->pool, qc->dcid.len); + if (qc->dcid.data == NULL) { + return NGX_ERROR; + } + + if (ngx_quic_create_server_id(c, qc->dcid.data) != NGX_OK) { + return NGX_ERROR; + } + + qc->tp.initial_scid = qc->dcid; + + cid = ngx_quic_alloc_client_id(c, qc); + if (cid == NULL) { + return NGX_ERROR; + } + + cid->seqnum = 0; + cid->len = pkt->scid.len; + ngx_memcpy(cid->id, pkt->scid.data, pkt->scid.len); + + ngx_queue_insert_tail(&qc->client_ids, &cid->queue); + qc->nclient_ids++; + qc->client_seqnum = 0; + + qc->server_seqnum = NGX_QUIC_UNSET_PN; + + osid = ngx_quic_insert_server_id(c, qc, &qc->odcid); + if (osid == NULL) { + return NGX_ERROR; + } + + qc->server_seqnum = 0; + + sid = ngx_quic_insert_server_id(c, qc, &qc->dcid); + if (sid == NULL) { + ngx_rbtree_delete(&c->listening->rbtree, &osid->udp.node); + return NGX_ERROR; + } + + c->udp = &sid->udp; + + return NGX_OK; +} + + +static ngx_int_t +ngx_quic_create_server_id(ngx_connection_t *c, u_char *id) +{ + if (RAND_bytes(id, NGX_QUIC_SERVER_CID_LEN) != 1) { + return NGX_ERROR; + } + +#if (NGX_QUIC_BPF) + if (ngx_quic_bpf_attach_id(c, id) != NGX_OK) { + ngx_log_error(NGX_LOG_ERR, c->log, 0, + "quic bpf failed to generate socket key"); + /* ignore error, things still may work */ + } +#endif + + ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, + "quic create server id %*xs", + (size_t) NGX_QUIC_SERVER_CID_LEN, id); + return NGX_OK; +} + + +#if (NGX_QUIC_BPF) + +static ngx_int_t +ngx_quic_bpf_attach_id(ngx_connection_t *c, u_char *id) +{ + int fd; + uint64_t cookie; + socklen_t optlen; + + fd = c->listening->fd; + + optlen = sizeof(cookie); + + if (getsockopt(fd, SOL_SOCKET, SO_COOKIE, &cookie, &optlen) == -1) { + ngx_log_error(NGX_LOG_ERR, c->log, ngx_socket_errno, + "quic getsockopt(SO_COOKIE) failed"); + + return NGX_ERROR; + } + + ngx_quic_dcid_encode_key(id, cookie); + + return NGX_OK; +} + +#endif + + + + +ngx_int_t +ngx_quic_handle_new_connection_id_frame(ngx_connection_t *c, + ngx_quic_header_t *pkt, ngx_quic_new_conn_id_frame_t *f) +{ + ngx_queue_t *q; + ngx_quic_client_id_t *cid, *item; + ngx_quic_connection_t *qc; + + qc = ngx_quic_get_connection(c); + + if (f->seqnum < qc->max_retired_seqnum) { + /* + * An endpoint that receives a NEW_CONNECTION_ID frame with + * a sequence number smaller than the Retire Prior To field + * of a previously received NEW_CONNECTION_ID frame MUST send + * a corresponding RETIRE_CONNECTION_ID frame that retires + * the newly received connection ID, unless it has already + * done so for that sequence number. + */ + + if (ngx_quic_retire_connection_id(c, pkt->level, f->seqnum) != NGX_OK) { + return NGX_ERROR; + } + + goto retire; + } + + cid = NULL; + + for (q = ngx_queue_head(&qc->client_ids); + q != ngx_queue_sentinel(&qc->client_ids); + q = ngx_queue_next(q)) + { + item = ngx_queue_data(q, ngx_quic_client_id_t, queue); + + if (item->seqnum == f->seqnum) { + cid = item; + break; + } + } + + if (cid) { + /* + * Transmission errors, timeouts and retransmissions might cause the + * same NEW_CONNECTION_ID frame to be received multiple times + */ + + if (cid->len != f->len + || ngx_strncmp(cid->id, f->cid, f->len) != 0 + || ngx_strncmp(cid->sr_token, f->srt, NGX_QUIC_SR_TOKEN_LEN) != 0) + { + /* + * ..a sequence number is used for different connection IDs, + * the endpoint MAY treat that receipt as a connection error + * of type PROTOCOL_VIOLATION. + */ + qc->error = NGX_QUIC_ERR_PROTOCOL_VIOLATION; + qc->error_reason = "seqnum refers to different connection id/token"; + return NGX_ERROR; + } + + } else { + + cid = ngx_quic_alloc_client_id(c, qc); + if (cid == NULL) { + return NGX_ERROR; + } + + cid->seqnum = f->seqnum; + cid->len = f->len; + ngx_memcpy(cid->id, f->cid, f->len); + + ngx_memcpy(cid->sr_token, f->srt, NGX_QUIC_SR_TOKEN_LEN); + + ngx_queue_insert_tail(&qc->client_ids, &cid->queue); + qc->nclient_ids++; + + /* always use latest available connection id */ + if (f->seqnum > qc->client_seqnum) { + qc->scid.len = cid->len; + qc->scid.data = cid->id; + qc->client_seqnum = f->seqnum; + } + } + +retire: + + if (qc->max_retired_seqnum && f->retire <= qc->max_retired_seqnum) { + /* + * Once a sender indicates a Retire Prior To value, smaller values sent + * in subsequent NEW_CONNECTION_ID frames have no effect. A receiver + * MUST ignore any Retire Prior To fields that do not increase the + * largest received Retire Prior To value. + */ + goto done; + } + + qc->max_retired_seqnum = f->retire; + + q = ngx_queue_head(&qc->client_ids); + + while (q != ngx_queue_sentinel(&qc->client_ids)) { + + cid = ngx_queue_data(q, ngx_quic_client_id_t, queue); + q = ngx_queue_next(q); + + if (cid->seqnum >= f->retire) { + continue; + } + + /* this connection id must be retired */ + + if (ngx_quic_retire_connection_id(c, pkt->level, cid->seqnum) + != NGX_OK) + { + return NGX_ERROR; + } + + ngx_queue_remove(&cid->queue); + ngx_queue_insert_head(&qc->free_client_ids, &cid->queue); + qc->nclient_ids--; + } + +done: + + if (qc->nclient_ids > qc->tp.active_connection_id_limit) { + /* + * After processing a NEW_CONNECTION_ID frame and + * adding and retiring active connection IDs, if the number of active + * connection IDs exceeds the value advertised in its + * active_connection_id_limit transport parameter, an endpoint MUST + * close the connection with an error of type CONNECTION_ID_LIMIT_ERROR. + */ + qc->error = NGX_QUIC_ERR_CONNECTION_ID_LIMIT_ERROR; + qc->error_reason = "too many connection ids received"; + return NGX_ERROR; + } + + return NGX_OK; +} + + +static ngx_int_t +ngx_quic_retire_connection_id(ngx_connection_t *c, + enum ssl_encryption_level_t level, uint64_t seqnum) +{ + ngx_quic_frame_t *frame; + ngx_quic_connection_t *qc; + + qc = ngx_quic_get_connection(c); + + frame = ngx_quic_alloc_frame(c); + if (frame == NULL) { + return NGX_ERROR; + } + + frame->level = level; + frame->type = NGX_QUIC_FT_RETIRE_CONNECTION_ID; + frame->u.retire_cid.sequence_number = seqnum; + + ngx_quic_queue_frame(qc, frame); + + return NGX_OK; +} + + +ngx_int_t +ngx_quic_handle_retire_connection_id_frame(ngx_connection_t *c, + ngx_quic_header_t *pkt, ngx_quic_retire_cid_frame_t *f) +{ + ngx_queue_t *q; + ngx_quic_server_id_t *sid; + ngx_quic_connection_t *qc; + + qc = ngx_quic_get_connection(c); + + for (q = ngx_queue_head(&qc->server_ids); + q != ngx_queue_sentinel(&qc->server_ids); + q = ngx_queue_next(q)) + { + sid = ngx_queue_data(q, ngx_quic_server_id_t, queue); + + if (sid->seqnum == f->sequence_number) { + ngx_queue_remove(q); + ngx_queue_insert_tail(&qc->free_server_ids, &sid->queue); + ngx_rbtree_delete(&c->listening->rbtree, &sid->udp.node); + qc->nserver_ids--; + break; + } + } + + return ngx_quic_issue_server_ids(c); +} + + +ngx_int_t +ngx_quic_issue_server_ids(ngx_connection_t *c) +{ + ngx_str_t dcid; + ngx_uint_t n; + ngx_quic_frame_t *frame; + ngx_quic_server_id_t *sid; + ngx_quic_connection_t *qc; + u_char id[NGX_QUIC_SERVER_CID_LEN]; + + qc = ngx_quic_get_connection(c); + + n = ngx_min(NGX_QUIC_MAX_SERVER_IDS, qc->ctp.active_connection_id_limit); + + ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, + "quic issue server ids has:%ui max:%ui", qc->nserver_ids, n); + + while (qc->nserver_ids < n) { + if (ngx_quic_create_server_id(c, id) != NGX_OK) { + return NGX_ERROR; + } + + dcid.len = NGX_QUIC_SERVER_CID_LEN; + dcid.data = id; + + sid = ngx_quic_insert_server_id(c, qc, &dcid); + if (sid == NULL) { + return NGX_ERROR; + } + + frame = ngx_quic_alloc_frame(c); + if (frame == NULL) { + return NGX_ERROR; + } + + frame->level = ssl_encryption_application; + frame->type = NGX_QUIC_FT_NEW_CONNECTION_ID; + frame->u.ncid.seqnum = sid->seqnum; + frame->u.ncid.retire = 0; + frame->u.ncid.len = NGX_QUIC_SERVER_CID_LEN; + ngx_memcpy(frame->u.ncid.cid, id, NGX_QUIC_SERVER_CID_LEN); + + if (ngx_quic_new_sr_token(c, &dcid, qc->conf->sr_token_key, + frame->u.ncid.srt) + != NGX_OK) + { + return NGX_ERROR; + } + + ngx_quic_queue_frame(qc, frame); + } + + return NGX_OK; +} + + +void +ngx_quic_clear_temp_server_ids(ngx_connection_t *c) +{ + ngx_queue_t *q, *next; + ngx_quic_server_id_t *sid; + ngx_quic_connection_t *qc; + + qc = ngx_quic_get_connection(c); + + ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0, + "quic clear temp server ids"); + + for (q = ngx_queue_head(&qc->server_ids); + q != ngx_queue_sentinel(&qc->server_ids); + q = next) + { + next = ngx_queue_next(q); + sid = ngx_queue_data(q, ngx_quic_server_id_t, queue); + + if (sid->seqnum != NGX_QUIC_UNSET_PN) { + continue; + } + + ngx_queue_remove(q); + ngx_queue_insert_tail(&qc->free_server_ids, &sid->queue); + ngx_rbtree_delete(&c->listening->rbtree, &sid->udp.node); + qc->nserver_ids--; + } +} + + +static ngx_quic_server_id_t * +ngx_quic_insert_server_id(ngx_connection_t *c, ngx_quic_connection_t *qc, + ngx_str_t *id) +{ + ngx_str_t dcid; + ngx_quic_server_id_t *sid; + + sid = ngx_quic_alloc_server_id(c, qc); + if (sid == NULL) { + return NULL; + } + + sid->quic = qc; + + sid->seqnum = qc->server_seqnum; + + if (qc->server_seqnum != NGX_QUIC_UNSET_PN) { + qc->server_seqnum++; + } + + sid->len = id->len; + ngx_memcpy(sid->id, id->data, id->len); + + ngx_queue_insert_tail(&qc->server_ids, &sid->queue); + qc->nserver_ids++; + + dcid.data = sid->id; + dcid.len = sid->len; + + ngx_insert_udp_connection(c, &sid->udp, &dcid); + + ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0, + "quic insert server id seqnum:%uL id len:%uz %xV", + sid->seqnum, id->len, id); + + return sid; +} + + +static ngx_quic_client_id_t * +ngx_quic_alloc_client_id(ngx_connection_t *c, ngx_quic_connection_t *qc) +{ + ngx_queue_t *q; + ngx_quic_client_id_t *cid; + + if (!ngx_queue_empty(&qc->free_client_ids)) { + + q = ngx_queue_head(&qc->free_client_ids); + cid = ngx_queue_data(q, ngx_quic_client_id_t, queue); + + ngx_queue_remove(&cid->queue); + + ngx_memzero(cid, sizeof(ngx_quic_client_id_t)); + + } else { + + cid = ngx_pcalloc(c->pool, sizeof(ngx_quic_client_id_t)); + if (cid == NULL) { + return NULL; + } + } + + return cid; +} + + +static ngx_quic_server_id_t * +ngx_quic_alloc_server_id(ngx_connection_t *c, ngx_quic_connection_t *qc) +{ + ngx_queue_t *q; + ngx_quic_server_id_t *sid; + + if (!ngx_queue_empty(&qc->free_server_ids)) { + + q = ngx_queue_head(&qc->free_server_ids); + sid = ngx_queue_data(q, ngx_quic_server_id_t, queue); + + ngx_queue_remove(&sid->queue); + + ngx_memzero(sid, sizeof(ngx_quic_server_id_t)); + + } else { + + sid = ngx_pcalloc(c->pool, sizeof(ngx_quic_server_id_t)); + if (sid == NULL) { + return NULL; + } + } + + return sid; +}