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620 lines
18 KiB
C
620 lines
18 KiB
C
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/*
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* Copyright 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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#include "internal/quic_rcidm.h"
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#include "internal/priority_queue.h"
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#include "internal/list.h"
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#include "internal/common.h"
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/*
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* QUIC Remote Connection ID Manager
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* =================================
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*
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* We can receive an arbitrary number of RCIDs via NCID frames. Periodically, we
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* may desire (for example for anti-connection fingerprinting reasons, etc.)
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* to switch to a new RCID according to some arbitrary policy such as the number
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* of packets we have sent.
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*
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* When we do this we should move to the next RCID in the sequence of received
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* RCIDs ordered by sequence number. For example, if a peer sends us three NCID
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* frames with sequence numbers 10, 11, 12, we should seek to consume these
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* RCIDs in order.
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*
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* However, due to the possibility of packet reordering in the network, NCID
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* frames might be received out of order. Thus if a peer sends us NCID frames
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* with sequence numbers 12, 10, 11, we should still consume the RCID with
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* sequence number 10 before consuming the RCIDs with sequence numbers 11 or 12.
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*
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* We use a priority queue for this purpose.
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*/
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static void rcidm_update(QUIC_RCIDM *rcidm);
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static void rcidm_set_preferred_rcid(QUIC_RCIDM *rcidm,
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const QUIC_CONN_ID *rcid);
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#define PACKETS_PER_RCID 1000
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#define INITIAL_SEQ_NUM 0
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#define PREF_ADDR_SEQ_NUM 1
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/*
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* RCID
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* ====
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*
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* The RCID structure is used to track RCIDs which have sequence numbers (i.e.,
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* INITIAL, PREF_ADDR and NCID type RCIDs). The RCIDs without sequence numbers
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* (Initial ODCIDs and Retry ODCIDs), hereafter referred to as unnumbered RCIDs,
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* can logically be viewed as their own type of RCID but are tracked separately
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* as singletons without needing a discrete structure.
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*
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* At any given time an RCID object is in one of these states:
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*
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*
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* (start)
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* |
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* [add]
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* |
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* _____v_____ ___________ ____________
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* | | | | | |
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* | PENDING | --[select]--> | CURRENT | --[retire]--> | RETIRING |
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* |___________| |___________| |____________|
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* |
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* [pop]
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* |
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* v
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* (fin)
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*
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* The transition through the states is monotonic and irreversible.
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* The RCID object is freed when it is popped.
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*
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* PENDING
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* Invariants:
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* rcid->state == RCID_STATE_PENDING;
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* rcid->pq_idx != SIZE_MAX (debug assert only);
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* the RCID is not the current RCID, rcidm->cur_rcid != rcid;
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* the RCID is in the priority queue;
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* the RCID is not in the retiring_list.
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*
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* CURRENT
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* Invariants:
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* rcid->state == RCID_STATE_CUR;
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* rcid->pq_idx == SIZE_MAX (debug assert only);
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* the RCID is the current RCID, rcidm->cur_rcid == rcid;
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* the RCID is not in the priority queue;
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* the RCID is not in the retiring_list.
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*
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* RETIRE
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* Invariants:
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* rcid->state == RCID_STATE_RETIRE;
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* rcid->pq_idx == SIZE_MAX (debug assert only);
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* the RCID is not the current RCID, rcidm->cur_rcid != rcid;
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* the RCID is not in the priority queue;
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* the RCID is not in the retiring_list.
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*
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* Invariant: At most one RCID object is in the CURRENT state at any one time.
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*
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* (If no RCID object is in the CURRENT state, this means either
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* an unnumbered RCID is being used as the preferred RCID
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* or we currently have no preferred RCID.)
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*/
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enum {
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RCID_STATE_PENDING,
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RCID_STATE_CUR,
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RCID_STATE_RETIRING,
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};
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enum {
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RCID_TYPE_INITIAL, /* CID is from an peer INITIAL packet (seq 0) */
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RCID_TYPE_PREF_ADDR, /* CID is from a preferred_address TPARAM (seq 1) */
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RCID_TYPE_NCID, /* CID is from a NCID frame */
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/*
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* INITIAL_ODCID and RETRY_ODCID also conceptually exist but are tracked
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* separately.
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*/
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};
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typedef struct rcid_st {
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OSSL_LIST_MEMBER(retiring, struct rcid_st); /* valid iff retire == 1 */
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QUIC_CONN_ID cid; /* The actual CID string for this RCID */
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uint64_t seq_num;
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size_t pq_idx; /* Index of entry into priority queue */
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unsigned int state : 2; /* RCID_STATE_* */
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unsigned int type : 2; /* RCID_TYPE_* */
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} RCID;
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DEFINE_PRIORITY_QUEUE_OF(RCID);
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DEFINE_LIST_OF(retiring, RCID);
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/*
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* RCID Manager
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* ============
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*
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* The following "business logic" invariants also apply to the RCIDM
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* as a whole:
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*
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* Invariant: An RCID of INITIAL type has a sequence number of 0.
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* Invariant: An RCID of PREF_ADDR type has a sequence number of 1.
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*
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* Invariant: There is never more than one Initial ODCID
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* added throughout the lifetime of an RCIDM.
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* Invariant: There is never more than one Retry ODCID
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* added throughout the lifetime of an RCIDM.
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* Invariant: There is never more than one INITIAL RCID created
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* throughout the lifetime of an RCIDM.
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* Invariant: There is never more than one PREF_ADDR RCID created
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* throughout the lifetime of an RCIDM.
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* Invariant: No INITIAL or PREF_ADDR RCID may be added after
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* the handshake is completed.
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*
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*/
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struct quic_rcidm_st {
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/*
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* The current RCID we prefer to use (value undefined if
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* !have_preferred_rcid).
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*/
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QUIC_CONN_ID preferred_rcid;
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/*
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* These are initialized if the corresponding added_ flags are set.
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*/
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QUIC_CONN_ID initial_odcid, retry_odcid;
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/*
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* Total number of packets sent since we last made a packet count-based RCID
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* update decision.
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*/
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uint64_t packets_sent;
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/* Number of post-handshake RCID changes we have performed. */
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uint64_t num_changes;
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/*
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* The Retire Prior To watermark value; max(retire_prior_to) of all received
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* NCID frames.
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*/
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uint64_t retire_prior_to;
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/* (SORT BY seq_num ASC) -> (RCID *) */
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PRIORITY_QUEUE_OF(RCID) *rcids;
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/*
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* Current RCID we are using. This may differ from the first item in the
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* priority queue if we received NCID frames out of order. For example if we
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* get seq 5, switch to it immediately, then get seq 4, we want to keep
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* using seq 5 until we decide to roll again rather than immediately switch
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* to seq 4. Never points to an object on the retiring_list.
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*/
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RCID *cur_rcid;
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/*
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* When a RCID becomes pending-retirement, it is moved to the retiring_list,
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* then freed when it is popped from the retired queue. We use a list for
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* this rather than a priority queue as the order in which items are freed
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* does not matter. We always append to the tail of the list in order to
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* maintain the guarantee that the head (if present) only changes when a
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* caller calls pop().
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*/
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OSSL_LIST(retiring) retiring_list;
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/* preferred_rcid has been changed? */
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unsigned int preferred_rcid_changed : 1;
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/* Do we have any RCID we can use currently? */
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unsigned int have_preferred_rcid : 1;
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/* QUIC handshake has been completed? */
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unsigned int handshake_complete : 1;
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/* odcid was set (not necessarily still valid as a RCID)? */
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unsigned int added_initial_odcid : 1;
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/* retry_odcid was set (not necessarily still valid as a RCID?) */
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unsigned int added_retry_odcid : 1;
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/* An initial RCID was added as an RCID structure? */
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unsigned int added_initial_rcid : 1;
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/* Has a RCID roll been manually requested? */
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unsigned int roll_requested : 1;
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};
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/* Check invariants of an RCID */
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static void rcidm_check_rcid(QUIC_RCIDM *rcidm, RCID *rcid)
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{
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assert(rcid->state == RCID_STATE_PENDING
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|| rcid->state == RCID_STATE_CUR
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|| rcid->state == RCID_STATE_RETIRING);
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assert((rcid->state == RCID_STATE_PENDING)
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== (rcid->pq_idx != SIZE_MAX));
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assert((rcid->state == RCID_STATE_CUR)
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== (rcidm->cur_rcid == rcid));
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assert((ossl_list_retiring_next(rcid) != NULL
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|| ossl_list_retiring_prev(rcid) != NULL
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|| ossl_list_retiring_head(&rcidm->retiring_list) == rcid)
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== (rcid->state == RCID_STATE_RETIRING));
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assert(rcid->type != RCID_TYPE_INITIAL || rcid->seq_num == 0);
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assert(rcid->type != RCID_TYPE_PREF_ADDR || rcid->seq_num == 1);
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assert(rcid->seq_num <= OSSL_QUIC_VLINT_MAX);
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assert(rcid->cid.id_len > 0 && rcid->cid.id_len <= QUIC_MAX_CONN_ID_LEN);
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assert(rcid->seq_num >= rcidm->retire_prior_to
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|| rcid->state == RCID_STATE_RETIRING);
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assert(rcidm->num_changes == 0 || rcidm->handshake_complete);
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}
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static int rcid_cmp(const RCID *a, const RCID *b)
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{
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if (a->seq_num < b->seq_num)
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return -1;
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if (a->seq_num > b->seq_num)
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return 1;
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return 0;
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}
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QUIC_RCIDM *ossl_quic_rcidm_new(const QUIC_CONN_ID *initial_odcid)
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{
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QUIC_RCIDM *rcidm;
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if ((rcidm = OPENSSL_zalloc(sizeof(*rcidm))) == NULL)
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return NULL;
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if ((rcidm->rcids = ossl_pqueue_RCID_new(rcid_cmp)) == NULL) {
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OPENSSL_free(rcidm);
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return NULL;
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}
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if (initial_odcid != NULL) {
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rcidm->initial_odcid = *initial_odcid;
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rcidm->added_initial_odcid = 1;
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}
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rcidm_update(rcidm);
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return rcidm;
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}
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void ossl_quic_rcidm_free(QUIC_RCIDM *rcidm)
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{
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RCID *rcid, *rnext;
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if (rcidm == NULL)
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return;
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OPENSSL_free(rcidm->cur_rcid);
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while ((rcid = ossl_pqueue_RCID_pop(rcidm->rcids)) != NULL)
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OPENSSL_free(rcid);
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LIST_FOREACH_DELSAFE(rcid, rnext, retiring, &rcidm->retiring_list)
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OPENSSL_free(rcid);
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ossl_pqueue_RCID_free(rcidm->rcids);
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OPENSSL_free(rcidm);
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}
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static void rcidm_set_preferred_rcid(QUIC_RCIDM *rcidm,
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const QUIC_CONN_ID *rcid)
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{
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if (rcid == NULL) {
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rcidm->preferred_rcid_changed = 1;
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rcidm->have_preferred_rcid = 0;
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return;
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}
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if (ossl_quic_conn_id_eq(&rcidm->preferred_rcid, rcid))
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return;
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rcidm->preferred_rcid = *rcid;
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rcidm->preferred_rcid_changed = 1;
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rcidm->have_preferred_rcid = 1;
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}
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/*
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* RCID Lifecycle Management
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* =========================
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*/
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static RCID *rcidm_create_rcid(QUIC_RCIDM *rcidm, uint64_t seq_num,
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const QUIC_CONN_ID *cid,
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unsigned int type)
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{
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RCID *rcid;
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if ((rcid = OPENSSL_zalloc(sizeof(*rcid))) == NULL)
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return NULL;
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rcid->seq_num = seq_num;
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rcid->cid = *cid;
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rcid->type = type;
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rcid->state = RCID_STATE_PENDING;
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if (!ossl_pqueue_RCID_push(rcidm->rcids, rcid, &rcid->pq_idx)) {
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OPENSSL_free(rcid);
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return NULL;
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}
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rcidm_check_rcid(rcidm, rcid);
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return rcid;
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}
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static void rcidm_transition_rcid(QUIC_RCIDM *rcidm, RCID *rcid,
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unsigned int state)
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{
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unsigned int old_state = rcid->state;
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assert(state >= old_state && state <= RCID_STATE_RETIRING);
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rcidm_check_rcid(rcidm, rcid);
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if (state == old_state)
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return;
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if (rcidm->cur_rcid != NULL && state == RCID_STATE_CUR) {
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rcidm_transition_rcid(rcidm, rcidm->cur_rcid, RCID_STATE_RETIRING);
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assert(rcidm->cur_rcid == NULL);
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}
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if (old_state == RCID_STATE_PENDING) {
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ossl_pqueue_RCID_remove(rcidm->rcids, rcid->pq_idx);
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rcid->pq_idx = SIZE_MAX;
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}
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rcid->state = state;
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if (state == RCID_STATE_CUR) {
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rcidm->cur_rcid = rcid;
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} else if (state == RCID_STATE_RETIRING) {
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if (old_state == RCID_STATE_CUR)
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rcidm->cur_rcid = NULL;
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ossl_list_retiring_insert_tail(&rcidm->retiring_list, rcid);
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}
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rcidm_check_rcid(rcidm, rcid);
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}
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static void rcidm_free_rcid(QUIC_RCIDM *rcidm, RCID *rcid)
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{
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if (rcid == NULL)
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return;
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rcidm_check_rcid(rcidm, rcid);
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switch (rcid->state) {
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case RCID_STATE_PENDING:
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ossl_pqueue_RCID_remove(rcidm->rcids, rcid->pq_idx);
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break;
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case RCID_STATE_CUR:
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rcidm->cur_rcid = NULL;
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break;
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case RCID_STATE_RETIRING:
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ossl_list_retiring_remove(&rcidm->retiring_list, rcid);
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break;
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default:
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assert(0);
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break;
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}
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OPENSSL_free(rcid);
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}
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static void rcidm_handle_retire_prior_to(QUIC_RCIDM *rcidm,
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uint64_t retire_prior_to)
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{
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RCID *rcid;
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if (retire_prior_to <= rcidm->retire_prior_to)
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return;
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rcidm->retire_prior_to = retire_prior_to;
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/*
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* Any RCIDs needing retirement will be at the start of the priority queue,
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* so just stop once we see a higher sequence number exceeding the
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* threshold.
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*/
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||
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while ((rcid = ossl_pqueue_RCID_peek(rcidm->rcids)) != NULL
|
||
|
&& rcid->seq_num < retire_prior_to)
|
||
|
rcidm_transition_rcid(rcidm, rcid, RCID_STATE_RETIRING);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Decision Logic
|
||
|
* ==============
|
||
|
*/
|
||
|
|
||
|
static void rcidm_roll(QUIC_RCIDM *rcidm)
|
||
|
{
|
||
|
RCID *rcid;
|
||
|
|
||
|
if (ossl_pqueue_RCID_num(rcidm->rcids) < 1)
|
||
|
return;
|
||
|
|
||
|
rcid = ossl_pqueue_RCID_peek(rcidm->rcids);
|
||
|
rcidm_transition_rcid(rcidm, rcid, RCID_STATE_CUR);
|
||
|
|
||
|
++rcidm->num_changes;
|
||
|
rcidm->roll_requested = 0;
|
||
|
|
||
|
if (rcidm->packets_sent >= PACKETS_PER_RCID)
|
||
|
rcidm->packets_sent %= PACKETS_PER_RCID;
|
||
|
else
|
||
|
rcidm->packets_sent = 0;
|
||
|
}
|
||
|
|
||
|
static void rcidm_update(QUIC_RCIDM *rcidm)
|
||
|
{
|
||
|
/* Prefer use of any current numbered RCID we have, if possible. */
|
||
|
if (rcidm->cur_rcid != NULL) {
|
||
|
rcidm_check_rcid(rcidm, rcidm->cur_rcid);
|
||
|
rcidm_set_preferred_rcid(rcidm, &rcidm->cur_rcid->cid);
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* If there are no RCIDs from NCID frames we can use, go through the various
|
||
|
* kinds of bootstrapping RCIDs we can use in order of priority.
|
||
|
*/
|
||
|
if (rcidm->added_retry_odcid) {
|
||
|
rcidm_set_preferred_rcid(rcidm, &rcidm->retry_odcid);
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
if (rcidm->added_initial_odcid && !rcidm->handshake_complete) {
|
||
|
rcidm_set_preferred_rcid(rcidm, &rcidm->initial_odcid);
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
/* We don't know of any usable RCIDs */
|
||
|
rcidm_set_preferred_rcid(rcidm, NULL);
|
||
|
}
|
||
|
|
||
|
static int rcidm_should_roll(QUIC_RCIDM *rcidm)
|
||
|
{
|
||
|
/*
|
||
|
* Always switch as soon as possible if handshake completes;
|
||
|
* and every n packets after handshake completes or the last roll; and
|
||
|
* whenever manually requested.
|
||
|
*/
|
||
|
return rcidm->handshake_complete
|
||
|
&& (rcidm->num_changes == 0
|
||
|
|| rcidm->packets_sent >= PACKETS_PER_RCID
|
||
|
|| rcidm->roll_requested);
|
||
|
}
|
||
|
|
||
|
static void rcidm_tick(QUIC_RCIDM *rcidm)
|
||
|
{
|
||
|
if (rcidm_should_roll(rcidm))
|
||
|
rcidm_roll(rcidm);
|
||
|
|
||
|
rcidm_update(rcidm);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Events
|
||
|
* ======
|
||
|
*/
|
||
|
void ossl_quic_rcidm_on_handshake_complete(QUIC_RCIDM *rcidm)
|
||
|
{
|
||
|
if (rcidm->handshake_complete)
|
||
|
return;
|
||
|
|
||
|
rcidm->handshake_complete = 1;
|
||
|
rcidm_tick(rcidm);
|
||
|
}
|
||
|
|
||
|
void ossl_quic_rcidm_on_packet_sent(QUIC_RCIDM *rcidm, uint64_t num_packets)
|
||
|
{
|
||
|
if (num_packets == 0)
|
||
|
return;
|
||
|
|
||
|
rcidm->packets_sent += num_packets;
|
||
|
rcidm_tick(rcidm);
|
||
|
}
|
||
|
|
||
|
void ossl_quic_rcidm_request_roll(QUIC_RCIDM *rcidm)
|
||
|
{
|
||
|
rcidm->roll_requested = 1;
|
||
|
rcidm_tick(rcidm);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Mutation Operations
|
||
|
* ===================
|
||
|
*/
|
||
|
int ossl_quic_rcidm_add_from_initial(QUIC_RCIDM *rcidm,
|
||
|
const QUIC_CONN_ID *rcid)
|
||
|
{
|
||
|
RCID *rcid_obj;
|
||
|
|
||
|
if (rcidm->added_initial_rcid || rcidm->handshake_complete)
|
||
|
return 0;
|
||
|
|
||
|
rcid_obj = rcidm_create_rcid(rcidm, INITIAL_SEQ_NUM,
|
||
|
rcid, RCID_TYPE_INITIAL);
|
||
|
if (rcid_obj == NULL)
|
||
|
return 0;
|
||
|
|
||
|
rcidm->added_initial_rcid = 1;
|
||
|
rcidm_tick(rcidm);
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
int ossl_quic_rcidm_add_from_server_retry(QUIC_RCIDM *rcidm,
|
||
|
const QUIC_CONN_ID *retry_odcid)
|
||
|
{
|
||
|
if (rcidm->added_retry_odcid || rcidm->handshake_complete)
|
||
|
return 0;
|
||
|
|
||
|
rcidm->retry_odcid = *retry_odcid;
|
||
|
rcidm->added_retry_odcid = 1;
|
||
|
rcidm_tick(rcidm);
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
int ossl_quic_rcidm_add_from_ncid(QUIC_RCIDM *rcidm,
|
||
|
const OSSL_QUIC_FRAME_NEW_CONN_ID *ncid)
|
||
|
{
|
||
|
RCID *rcid;
|
||
|
|
||
|
rcidm_handle_retire_prior_to(rcidm, ncid->retire_prior_to);
|
||
|
|
||
|
rcid = rcidm_create_rcid(rcidm, ncid->seq_num, &ncid->conn_id, RCID_TYPE_NCID);
|
||
|
if (rcid == NULL)
|
||
|
return 0;
|
||
|
|
||
|
rcidm_tick(rcidm);
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Queries
|
||
|
* =======
|
||
|
*/
|
||
|
|
||
|
static int rcidm_get_retire(QUIC_RCIDM *rcidm, uint64_t *seq_num, int peek)
|
||
|
{
|
||
|
RCID *rcid = ossl_list_retiring_head(&rcidm->retiring_list);
|
||
|
|
||
|
if (rcid == NULL)
|
||
|
return 0;
|
||
|
|
||
|
if (seq_num != NULL)
|
||
|
*seq_num = rcid->seq_num;
|
||
|
|
||
|
if (!peek)
|
||
|
rcidm_free_rcid(rcidm, rcid);
|
||
|
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
int ossl_quic_rcidm_pop_retire_seq_num(QUIC_RCIDM *rcidm,
|
||
|
uint64_t *seq_num)
|
||
|
{
|
||
|
return rcidm_get_retire(rcidm, seq_num, /*peek=*/0);
|
||
|
}
|
||
|
|
||
|
int ossl_quic_rcidm_peek_retire_seq_num(QUIC_RCIDM *rcidm,
|
||
|
uint64_t *seq_num)
|
||
|
{
|
||
|
return rcidm_get_retire(rcidm, seq_num, /*peek=*/1);
|
||
|
}
|
||
|
|
||
|
int ossl_quic_rcidm_get_preferred_tx_dcid(QUIC_RCIDM *rcidm,
|
||
|
QUIC_CONN_ID *tx_dcid)
|
||
|
{
|
||
|
if (!rcidm->have_preferred_rcid)
|
||
|
return 0;
|
||
|
|
||
|
*tx_dcid = rcidm->preferred_rcid;
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
int ossl_quic_rcidm_get_preferred_tx_dcid_changed(QUIC_RCIDM *rcidm,
|
||
|
int clear)
|
||
|
{
|
||
|
int r = rcidm->preferred_rcid_changed;
|
||
|
|
||
|
if (clear)
|
||
|
rcidm->preferred_rcid_changed = 0;
|
||
|
|
||
|
return r;
|
||
|
}
|