#ifndef OSSL_QUIC_CHANNEL_LOCAL_H # define OSSL_QUIC_CHANNEL_LOCAL_H # include "internal/quic_channel.h" # ifndef OPENSSL_NO_QUIC /* Represents the cause for a connection's termination. */ typedef struct quic_terminate_cause_st { /* * If we are in a TERMINATING or TERMINATED state, this is the error code * associated with the error. This field is valid iff we are in the * TERMINATING or TERMINATED states. */ uint64_t error_code; /* * If terminate_app is set and this is nonzero, this is the frame type which * caused the connection to be terminated. */ uint64_t frame_type; /* Is this error code in the transport (0) or application (1) space? */ unsigned int app : 1; /* * If set, the cause of the termination is a received CONNECTION_CLOSE * frame. Otherwise, we decided to terminate ourselves and sent a * CONNECTION_CLOSE frame (regardless of whether the peer later also sends * one). */ unsigned int remote : 1; } QUIC_TERMINATE_CAUSE; /* * QUIC Channel Structure * ====================== * * QUIC channel internals. It is intended that only the QUIC_CHANNEL * implementation and the RX depacketiser be allowed to access this structure * directly. As the RX depacketiser has no state of its own and computes over a * QUIC_CHANNEL structure, it can be viewed as an extention of the QUIC_CHANNEL * implementation. While the RX depacketiser could be provided with adequate * accessors to do what it needs, this would weaken the abstraction provided by * the QUIC_CHANNEL to other components; moreover the coupling of the RX * depacketiser to QUIC_CHANNEL internals is too deep and bespoke to make this * desirable. * * Other components should not include this header. */ struct quic_channel_st { OSSL_LIB_CTX *libctx; const char *propq; /* * The associated TLS 1.3 connection data. Used to provide the handshake * layer; its 'network' side is plugged into the crypto stream for each EL * (other than the 0-RTT EL). */ QUIC_DHS *dhs; /* TODO(QUIC): Replace this with a QUIC_TLS instance when ready. */ /* * The transport parameter block we will send or have sent. * Freed after sending or when connection is freed. */ unsigned char *local_transport_params; /* Asynchronous I/O reactor. */ QUIC_REACTOR rtor; /* Our current L4 peer address, if any. */ BIO_ADDR cur_peer_addr; /* Network-side read and write BIOs. */ BIO *net_rbio, *net_wbio; /* * Subcomponents of the connection. All of these components are instantiated * and owned by us. */ OSSL_QUIC_TX_PACKETISER *txp; QUIC_TXPIM *txpim; QUIC_CFQ *cfq; /* Connection level FC. */ QUIC_TXFC conn_txfc; QUIC_RXFC conn_rxfc; QUIC_STREAM_MAP qsm; OSSL_STATM statm; OSSL_CC_DATA *cc_data; const OSSL_CC_METHOD *cc_method; OSSL_ACKM *ackm; /* * RX demuxer. We register incoming DCIDs with this. Since we currently only * support client operation and use one L4 port per connection, we own the * demuxer and register a single zero-length DCID with it. */ QUIC_DEMUX *demux; /* Record layers in the TX and RX directions, plus the RX demuxer. */ OSSL_QTX *qtx; OSSL_QRX *qrx; /* * Send and receive parts of the crypto streams. * crypto_send[QUIC_PN_SPACE_APP] is the 1-RTT crypto stream. There is no * 0-RTT crypto stream. */ QUIC_SSTREAM *crypto_send[QUIC_PN_SPACE_NUM]; QUIC_RSTREAM *crypto_recv[QUIC_PN_SPACE_NUM]; /* * Our (currently only) application data stream. This is a bidirectional * client-initiated stream and thus (in QUICv1) always has a stream ID of 0. */ QUIC_STREAM *stream0; /* Internal state. */ /* * The DCID used in the first Initial packet we transmit as a client. * Randomly generated and required by RFC to be at least 8 bytes. */ QUIC_CONN_ID init_dcid; /* * The SCID found in the first Initial packet from the server. * Valid if have_received_enc_pkt is set. */ QUIC_CONN_ID init_scid; /* The SCID found in an incoming Retry packet we handled. */ QUIC_CONN_ID retry_scid; /* Transport parameter values received from server. */ uint64_t init_max_stream_data_bidi_local; uint64_t init_max_stream_data_bidi_remote; uint64_t init_max_stream_data_uni_remote; uint64_t rx_max_ack_delay; /* ms */ unsigned char rx_ack_delay_exp; /* * Temporary staging area to store information about the incoming packet we * are currently processing. */ OSSL_QRX_PKT *qrx_pkt; /* * Current limit on number of streams we may create. Set by transport * parameters initially and then by MAX_STREAMS frames. */ uint64_t max_local_streams_bidi; uint64_t max_local_streams_uni; /* The negotiated maximum idle timeout in milliseconds. */ uint64_t max_idle_timeout; /* * Maximum payload size in bytes for datagrams sent to our peer, as * negotiated by transport parameters. */ uint64_t rx_max_udp_payload_size; /* Maximum active CID limit, as negotiated by transport parameters. */ uint64_t rx_active_conn_id_limit; /* Valid if we are in the TERMINATING or TERMINATED states. */ QUIC_TERMINATE_CAUSE terminate_cause; /* * Deadline at which we move to TERMINATING state. Valid if in the * TERMINATING state. */ OSSL_TIME terminate_deadline; /* * Deadline at which connection dies due to idle timeout if no further * events occur. */ OSSL_TIME idle_deadline; /* * State tracking. QUIC connection-level state is best represented based on * whether various things have happened yet or not, rather than as an * explicit FSM. We do have a coarse state variable which tracks the basic * state of the connection's lifecycle, but more fine-grained conditions of * the Active state are tracked via flags below. For more details, see * doc/designs/quic-design/connection-state-machine.md. We are in the Open * state if the state is QUIC_CSM_STATE_ACTIVE and handshake_confirmed is * set. */ unsigned int state : 3; /* * Have we received at least one encrypted packet from the peer? * (If so, Retry and Version Negotiation messages should no longer * be received and should be ignored if they do occur.) */ unsigned int have_received_enc_pkt : 1; /* * Have we sent literally any packet yet? If not, there is no point polling * RX. */ unsigned int have_sent_any_pkt : 1; /* * Are we currently doing proactive version negotiation? */ unsigned int doing_proactive_ver_neg : 1; /* We have received transport parameters from the peer. */ unsigned int got_remote_transport_params : 1; /* * This monotonically transitions to 1 once the TLS state machine is * 'complete', meaning that it has both sent a Finished and successfully * verified the peer's Finished (see RFC 9001 s. 4.1.1). Note that it * does not transition to 1 at both peers simultaneously. * * Handshake completion is not the same as handshake confirmation (see * below). */ unsigned int handshake_complete : 1; /* * This monotonically transitions to 1 once the handshake is confirmed. * This happens on the client when we receive a HANDSHAKE_DONE frame. * At our option, we may also take acknowledgement of any 1-RTT packet * we sent as a handshake confirmation. */ unsigned int handshake_confirmed : 1; /* * We are sending Initial packets based on a Retry. This means we definitely * should not receive another Retry, and if we do it is an error. */ unsigned int doing_retry : 1; /* * We don't store the current EL here; the TXP asks the QTX which ELs * are provisioned to determine which ELs to use. */ /* Have statm, qsm been initialised? Used to track cleanup. */ unsigned int have_statm : 1; unsigned int have_qsm : 1; /* * Preferred EL for transmission. This is not strictly needed as it can be * inferred from what keys we have provisioned, but makes determining the * current EL simpler and faster. */ unsigned int tx_enc_level : 3; /* If bit n is set, EL n has been discarded. */ unsigned int el_discarded : 4; /* * While in TERMINATING - CLOSING, set when we should generate a connection * close frame. */ unsigned int conn_close_queued : 1; /* Are we in server mode? Never changes after instantiation. */ unsigned int is_server : 1; }; # endif #endif