210 lines
9.0 KiB
C
210 lines
9.0 KiB
C
/*
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* Copyright 2022-2023 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#ifndef OSSL_QUIC_TXP_H
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# define OSSL_QUIC_TXP_H
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# include <openssl/ssl.h>
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# include "internal/quic_types.h"
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# include "internal/quic_record_tx.h"
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# include "internal/quic_cfq.h"
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# include "internal/quic_txpim.h"
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# include "internal/quic_stream.h"
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# include "internal/quic_stream_map.h"
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# include "internal/quic_fc.h"
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# include "internal/bio_addr.h"
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# include "internal/time.h"
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# ifndef OPENSSL_NO_QUIC
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/*
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* QUIC TX Packetiser
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* ==================
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*/
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typedef struct ossl_quic_tx_packetiser_args_st {
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/* Configuration Settings */
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QUIC_CONN_ID cur_scid; /* Current Source Connection ID we use. */
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QUIC_CONN_ID cur_dcid; /* Current Destination Connection ID we use. */
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BIO_ADDR peer; /* Current destination L4 address we use. */
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uint32_t ack_delay_exponent; /* ACK delay exponent used when encoding. */
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/* Injected Dependencies */
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OSSL_QTX *qtx; /* QUIC Record Layer TX we are using */
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QUIC_TXPIM *txpim; /* QUIC TX'd Packet Information Manager */
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QUIC_CFQ *cfq; /* QUIC Control Frame Queue */
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OSSL_ACKM *ackm; /* QUIC Acknowledgement Manager */
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QUIC_STREAM_MAP *qsm; /* QUIC Streams Map */
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QUIC_TXFC *conn_txfc; /* QUIC Connection-Level TX Flow Controller */
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QUIC_RXFC *conn_rxfc; /* QUIC Connection-Level RX Flow Controller */
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QUIC_RXFC *max_streams_bidi_rxfc; /* QUIC RXFC for MAX_STREAMS generation */
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QUIC_RXFC *max_streams_uni_rxfc;
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const OSSL_CC_METHOD *cc_method; /* QUIC Congestion Controller */
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OSSL_CC_DATA *cc_data; /* QUIC Congestion Controller Instance */
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OSSL_TIME (*now)(void *arg); /* Callback to get current time. */
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void *now_arg;
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/*
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* Injected dependencies - crypto streams.
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*
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* Note: There is no crypto stream for the 0-RTT EL.
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* crypto[QUIC_PN_SPACE_APP] is the 1-RTT crypto stream.
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*/
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QUIC_SSTREAM *crypto[QUIC_PN_SPACE_NUM];
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} OSSL_QUIC_TX_PACKETISER_ARGS;
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typedef struct ossl_quic_tx_packetiser_st OSSL_QUIC_TX_PACKETISER;
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OSSL_QUIC_TX_PACKETISER *ossl_quic_tx_packetiser_new(const OSSL_QUIC_TX_PACKETISER_ARGS *args);
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typedef void (ossl_quic_initial_token_free_fn)(const unsigned char *buf,
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size_t buf_len, void *arg);
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void ossl_quic_tx_packetiser_free(OSSL_QUIC_TX_PACKETISER *txp);
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/*
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* When in the closing state we need to maintain a count of received bytes
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* so that we can limit the number of close connection frames we send.
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* Refer RFC 9000 s. 10.2.1 Closing Connection State.
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*/
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void ossl_quic_tx_packetiser_record_received_closing_bytes(
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OSSL_QUIC_TX_PACKETISER *txp, size_t n);
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/*
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* Generates a datagram by polling the various ELs to determine if they want to
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* generate any frames, and generating a datagram which coalesces packets for
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* any ELs which do.
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*
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* Returns 0 on failure (e.g. allocation error or other errors), 1 otherwise.
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*
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* *status is filled with status information about the generated packet.
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* It is always filled even in case of failure. In particular, packets can be
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* sent even if failure is later returned.
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* See QUIC_TXP_STATUS for details.
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*/
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typedef struct quic_txp_status_st {
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int sent_ack_eliciting; /* Was an ACK-eliciting packet sent? */
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int sent_handshake; /* Was a Handshake packet sent? */
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size_t sent_pkt; /* Number of packets sent (0 if nothing was sent) */
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} QUIC_TXP_STATUS;
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int ossl_quic_tx_packetiser_generate(OSSL_QUIC_TX_PACKETISER *txp,
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QUIC_TXP_STATUS *status);
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/*
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* Returns a deadline after which a call to ossl_quic_tx_packetiser_generate()
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* might succeed even if it did not previously. This may return
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* ossl_time_infinite() if there is no such deadline currently applicable. It
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* returns ossl_time_zero() if there is (potentially) more data to be generated
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* immediately. The value returned is liable to change after any call to
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* ossl_quic_tx_packetiser_generate() (or after ACKM or CC state changes). Note
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* that ossl_quic_tx_packetiser_generate() can also start to succeed for other
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* non-chronological reasons, such as changes to send stream buffers, etc.
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*/
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OSSL_TIME ossl_quic_tx_packetiser_get_deadline(OSSL_QUIC_TX_PACKETISER *txp);
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/*
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* Set the token used in Initial packets. The callback is called when the buffer
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* is no longer needed; for example, when the TXP is freed or when this function
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* is called again with a new buffer. Fails returning 0 if the token is too big
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* to ever be reasonably encapsulated in an outgoing packet based on our current
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* understanding of our PMTU.
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*/
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int ossl_quic_tx_packetiser_set_initial_token(OSSL_QUIC_TX_PACKETISER *txp,
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const unsigned char *token,
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size_t token_len,
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ossl_quic_initial_token_free_fn *free_cb,
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void *free_cb_arg);
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/* Change the DCID the TXP uses to send outgoing packets. */
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int ossl_quic_tx_packetiser_set_cur_dcid(OSSL_QUIC_TX_PACKETISER *txp,
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const QUIC_CONN_ID *dcid);
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/* Change the SCID the TXP uses to send outgoing (long) packets. */
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int ossl_quic_tx_packetiser_set_cur_scid(OSSL_QUIC_TX_PACKETISER *txp,
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const QUIC_CONN_ID *scid);
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/*
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* Change the destination L4 address the TXP uses to send datagrams. Specify
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* NULL (or AF_UNSPEC) to disable use of addressed mode.
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*/
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int ossl_quic_tx_packetiser_set_peer(OSSL_QUIC_TX_PACKETISER *txp,
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const BIO_ADDR *peer);
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/*
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* Inform the TX packetiser that an EL has been discarded. Idempotent.
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*
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* This does not inform the QTX as well; the caller must also inform the QTX.
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*
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* The TXP will no longer reference the crypto[enc_level] QUIC_SSTREAM which was
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* provided in the TXP arguments. However, it is the callers responsibility to
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* free that QUIC_SSTREAM if desired.
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*/
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int ossl_quic_tx_packetiser_discard_enc_level(OSSL_QUIC_TX_PACKETISER *txp,
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uint32_t enc_level);
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/*
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* Informs the TX packetiser that the handshake is complete. The TX packetiser
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* will not send 1-RTT application data until the handshake is complete,
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* as the authenticity of the peer is not confirmed until the handshake
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* complete event occurs.
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*/
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void ossl_quic_tx_packetiser_notify_handshake_complete(OSSL_QUIC_TX_PACKETISER *txp);
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/* Asks the TXP to generate a HANDSHAKE_DONE frame in the next 1-RTT packet. */
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void ossl_quic_tx_packetiser_schedule_handshake_done(OSSL_QUIC_TX_PACKETISER *txp);
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/* Asks the TXP to ensure the next packet in the given PN space is ACK-eliciting. */
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void ossl_quic_tx_packetiser_schedule_ack_eliciting(OSSL_QUIC_TX_PACKETISER *txp,
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uint32_t pn_space);
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/*
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* Asks the TXP to ensure an ACK is put in the next packet in the given PN
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* space.
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*/
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void ossl_quic_tx_packetiser_schedule_ack(OSSL_QUIC_TX_PACKETISER *txp,
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uint32_t pn_space);
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/*
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* Schedules a connection close. *f and f->reason are copied. This operation is
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* irreversible and causes all further packets generated by the TXP to contain a
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* CONNECTION_CLOSE frame. This function fails if it has already been called
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* successfully; the information in *f cannot be changed after the first
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* successful call to this function.
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*/
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int ossl_quic_tx_packetiser_schedule_conn_close(OSSL_QUIC_TX_PACKETISER *txp,
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const OSSL_QUIC_FRAME_CONN_CLOSE *f);
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/* Setters for the msg_callback and msg_callback_arg */
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void ossl_quic_tx_packetiser_set_msg_callback(OSSL_QUIC_TX_PACKETISER *txp,
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ossl_msg_cb msg_callback,
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SSL *msg_callback_ssl);
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void ossl_quic_tx_packetiser_set_msg_callback_arg(OSSL_QUIC_TX_PACKETISER *txp,
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void *msg_callback_arg);
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/*
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* Determines the next PN which will be used for a given PN space.
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*/
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QUIC_PN ossl_quic_tx_packetiser_get_next_pn(OSSL_QUIC_TX_PACKETISER *txp,
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uint32_t pn_space);
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/*
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* Sets a callback which is called whenever TXP sends an ACK frame. The callee
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* must not modify the ACK frame data. Can be used to snoop on PNs being ACKed.
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*/
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void ossl_quic_tx_packetiser_set_ack_tx_cb(OSSL_QUIC_TX_PACKETISER *txp,
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void (*cb)(const OSSL_QUIC_FRAME_ACK *ack,
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uint32_t pn_space,
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void *arg),
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void *cb_arg);
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# endif
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#endif
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