/src/openssl/ssl/quic/quic_cfq.c

Source
/*
 * Copyright 2022-2026 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the Apache License 2.0 (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include "internal/quic_channel.h"
#include "internal/quic_cfq.h"
#include "internal/numbers.h"

typedef struct quic_cfq_item_ex_st QUIC_CFQ_ITEM_EX;

struct quic_cfq_item_ex_st {
    QUIC_CFQ_ITEM public;
    QUIC_CFQ_ITEM_EX *prev, *next;
    unsigned char *encoded;
    cfq_free_cb *free_cb;
    void *free_cb_arg;
    uint64_t frame_type;
    size_t encoded_len;
    uint32_t priority, pn_space, flags;
    int state;
};

uint64_t ossl_quic_cfq_item_get_frame_type(const QUIC_CFQ_ITEM *item)
{
    const QUIC_CFQ_ITEM_EX *ex = (const QUIC_CFQ_ITEM_EX *)item;

    return ex->frame_type;
}

const unsigned char *ossl_quic_cfq_item_get_encoded(const QUIC_CFQ_ITEM *item)
{
    const QUIC_CFQ_ITEM_EX *ex = (const QUIC_CFQ_ITEM_EX *)item;

    return ex->encoded;
}

size_t ossl_quic_cfq_item_get_encoded_len(const QUIC_CFQ_ITEM *item)
{
    const QUIC_CFQ_ITEM_EX *ex = (const QUIC_CFQ_ITEM_EX *)item;

    return ex->encoded_len;
}

int ossl_quic_cfq_item_get_state(const QUIC_CFQ_ITEM *item)
{
    const QUIC_CFQ_ITEM_EX *ex = (const QUIC_CFQ_ITEM_EX *)item;

    return ex->state;
}

uint32_t ossl_quic_cfq_item_get_pn_space(const QUIC_CFQ_ITEM *item)
{
    const QUIC_CFQ_ITEM_EX *ex = (const QUIC_CFQ_ITEM_EX *)item;

    return ex->pn_space;
}

int ossl_quic_cfq_item_is_unreliable(const QUIC_CFQ_ITEM *item)
{
    const QUIC_CFQ_ITEM_EX *ex = (const QUIC_CFQ_ITEM_EX *)item;

    return (ex->flags & QUIC_CFQ_ITEM_FLAG_UNRELIABLE) != 0;
}

typedef struct quic_cfq_item_list_st {
    QUIC_CFQ_ITEM_EX *head, *tail;
} QUIC_CFQ_ITEM_LIST;

struct quic_cfq_st {
    /*
     * Invariant: A CFQ item is always in exactly one of these lists, never more
     * or less than one.
     *
     * Invariant: The list the CFQ item is determined exactly by the state field
     * of the item.
     */
    QUIC_CFQ_ITEM_LIST new_list, tx_list, free_list;
};

static int compare(const QUIC_CFQ_ITEM_EX *a, const QUIC_CFQ_ITEM_EX *b)
{
    if (a->pn_space < b->pn_space)
        return -1;
    else if (a->pn_space > b->pn_space)
        return 1;

    if (a->priority > b->priority)
        return -1;
    else if (a->priority < b->priority)
        return 1;

    return 0;
}

static void list_remove(QUIC_CFQ_ITEM_LIST *l, QUIC_CFQ_ITEM_EX *n)
{
    if (l->head == n)
        l->head = n->next;
    if (l->tail == n)
        l->tail = n->prev;
    if (n->prev != NULL)
        n->prev->next = n->next;
    if (n->next != NULL)
        n->next->prev = n->prev;
    n->prev = n->next = NULL;
}

static void list_insert_head(QUIC_CFQ_ITEM_LIST *l, QUIC_CFQ_ITEM_EX *n)
{
    n->next = l->head;
    n->prev = NULL;
    l->head = n;
    if (n->next != NULL)
        n->next->prev = n;
    if (l->tail == NULL)
        l->tail = n;
}

static void list_insert_tail(QUIC_CFQ_ITEM_LIST *l, QUIC_CFQ_ITEM_EX *n)
{
    n->prev = l->tail;
    n->next = NULL;
    l->tail = n;
    if (n->prev != NULL)
        n->prev->next = n;
    if (l->head == NULL)
        l->head = n;
}

static void list_insert_after(QUIC_CFQ_ITEM_LIST *l,
    QUIC_CFQ_ITEM_EX *ref,
    QUIC_CFQ_ITEM_EX *n)
{
    n->prev = ref;
    n->next = ref->next;
    if (ref->next != NULL)
        ref->next->prev = n;
    ref->next = n;
    if (l->tail == ref)
        l->tail = n;
}

static void list_insert_sorted(QUIC_CFQ_ITEM_LIST *l, QUIC_CFQ_ITEM_EX *n,
    int (*cmp)(const QUIC_CFQ_ITEM_EX *a,
        const QUIC_CFQ_ITEM_EX *b))
{
    QUIC_CFQ_ITEM_EX *p = l->head, *pprev = NULL;

    if (p == NULL) {
        l->head = l->tail = n;
        n->prev = n->next = NULL;
        return;
    }

    for (; p != NULL && cmp(p, n) < 0; pprev = p, p = p->next)
        ;

    if (p == NULL)
        list_insert_tail(l, n);
    else if (pprev == NULL)
        list_insert_head(l, n);
    else
        list_insert_after(l, pprev, n);
}

QUIC_CFQ *ossl_quic_cfq_new(void)
{
    QUIC_CFQ *cfq = OPENSSL_zalloc(sizeof(*cfq));

    if (cfq == NULL)
        return NULL;

    return cfq;
}

static void clear_item(QUIC_CFQ_ITEM_EX *item)
{
    if (item->free_cb != NULL) {
        item->free_cb(item->encoded, item->encoded_len, item->free_cb_arg);

        item->free_cb = NULL;
        item->encoded = NULL;
        item->encoded_len = 0;
    }

    item->state = -1;
}

static void free_list_items(QUIC_CFQ_ITEM_LIST *l)
{
    QUIC_CFQ_ITEM_EX *p, *pnext;

    for (p = l->head; p != NULL; p = pnext) {
        pnext = p->next;
        clear_item(p);
        OPENSSL_free(p);
    }
}

void ossl_quic_cfq_free(QUIC_CFQ *cfq)
{
    if (cfq == NULL)
        return;

    free_list_items(&cfq->new_list);
    free_list_items(&cfq->tx_list);
    free_list_items(&cfq->free_list);
    OPENSSL_free(cfq);
}

static QUIC_CFQ_ITEM_EX *cfq_get_free(QUIC_CFQ *cfq)
{
    QUIC_CFQ_ITEM_EX *item = cfq->free_list.head;

    if (item != NULL)
        return item;

    item = OPENSSL_zalloc(sizeof(*item));
    if (item == NULL)
        return NULL;

    item->state = -1;
    list_insert_tail(&cfq->free_list, item);
    return item;
}

QUIC_CFQ_ITEM *ossl_quic_cfq_add_frame(QUIC_CFQ *cfq,
    uint32_t priority,
    uint32_t pn_space,
    uint64_t frame_type,
    uint32_t flags,
    const unsigned char *encoded,
    size_t encoded_len,
    cfq_free_cb *free_cb,
    void *free_cb_arg)
{
    QUIC_CFQ_ITEM_EX *item = cfq_get_free(cfq);

    if (item == NULL)
        return NULL;

    item->priority = priority;
    item->frame_type = frame_type;
    item->pn_space = pn_space;
    item->encoded = (unsigned char *)encoded;
    item->encoded_len = encoded_len;
    item->free_cb = free_cb;
    item->free_cb_arg = free_cb_arg;

    item->state = QUIC_CFQ_STATE_NEW;
    item->flags = flags;
    list_remove(&cfq->free_list, item);
    list_insert_sorted(&cfq->new_list, item, compare);
    return &item->public;
}

void ossl_quic_cfq_mark_tx(QUIC_CFQ *cfq, QUIC_CFQ_ITEM *item)
{
    QUIC_CFQ_ITEM_EX *ex = (QUIC_CFQ_ITEM_EX *)item;

    switch (ex->state) {
    case QUIC_CFQ_STATE_NEW:
        list_remove(&cfq->new_list, ex);
        list_insert_tail(&cfq->tx_list, ex);
        ex->state = QUIC_CFQ_STATE_TX;
        break;
    case QUIC_CFQ_STATE_TX:
        break; /* nothing to do */
    default:
        assert(0); /* invalid state (e.g. in free state) */
        break;
    }
}

void ossl_quic_cfq_mark_lost(QUIC_CFQ *cfq, QUIC_CFQ_ITEM *item,
    uint32_t priority)
{
    QUIC_CFQ_ITEM_EX *ex = (QUIC_CFQ_ITEM_EX *)item;

    if (ossl_quic_cfq_item_is_unreliable(item)) {
        ossl_quic_cfq_release(cfq, item);
        return;
    }

    switch (ex->state) {
    case QUIC_CFQ_STATE_NEW:
        if (priority != UINT32_MAX && priority != ex->priority) {
            list_remove(&cfq->new_list, ex);
            ex->priority = priority;
            list_insert_sorted(&cfq->new_list, ex, compare);
        }
        break; /* nothing to do */
    case QUIC_CFQ_STATE_TX:
        if (priority != UINT32_MAX)
            ex->priority = priority;
        list_remove(&cfq->tx_list, ex);
        list_insert_sorted(&cfq->new_list, ex, compare);
        ex->state = QUIC_CFQ_STATE_NEW;
        break;
    default:
        assert(0); /* invalid state (e.g. in free state) */
        break;
    }
}

int ossl_quic_cfq_discard_unreliable(QUIC_CFQ *cfq, QUIC_CFQ_ITEM *item)
{
    int discarded;

    if (ossl_quic_cfq_item_is_unreliable(item)) {
        ossl_quic_cfq_release(cfq, item);
        discarded = 1;
    } else {
        discarded = 0;
    }

    return discarded;
}

/*
 * Releases a CFQ item. The item may be in either state (NEW or TX) prior to the
 * call. The QUIC_CFQ_ITEM pointer must not be used following this call.
 */
void ossl_quic_cfq_release(QUIC_CFQ *cfq, QUIC_CFQ_ITEM *item)
{
    QUIC_CFQ_ITEM_EX *ex = (QUIC_CFQ_ITEM_EX *)item;

    switch (ex->state) {
    case QUIC_CFQ_STATE_NEW:
        list_remove(&cfq->new_list, ex);
        list_insert_tail(&cfq->free_list, ex);
        clear_item(ex);
        break;
    case QUIC_CFQ_STATE_TX:
        list_remove(&cfq->tx_list, ex);
        list_insert_tail(&cfq->free_list, ex);
        clear_item(ex);
        break;
    default:
        assert(0); /* invalid state (e.g. in free state) */
        break;
    }
}

QUIC_CFQ_ITEM *ossl_quic_cfq_get_priority_head(const QUIC_CFQ *cfq,
    uint32_t pn_space)
{
    QUIC_CFQ_ITEM_EX *item = cfq->new_list.head;

    for (; item != NULL && item->pn_space != pn_space; item = item->next)
        ;

    if (item == NULL)
        return NULL;

    return &item->public;
}

QUIC_CFQ_ITEM *ossl_quic_cfq_item_get_priority_next(const QUIC_CFQ_ITEM *item,
    uint32_t pn_space)
{
    QUIC_CFQ_ITEM_EX *ex = (QUIC_CFQ_ITEM_EX *)item;

    if (ex == NULL)
        return NULL;

    ex = ex->next;

    for (; ex != NULL && ex->pn_space != pn_space; ex = ex->next)
        ;

    if (ex == NULL)
        return NULL; /* ubsan */

    return &ex->public;
}

Coverage Report

Created: 2026-06-18 06:34

Line	Count	Source
1		/*
2		* Copyright 2022-2026 The OpenSSL Project Authors. All Rights Reserved.
3		*
4		* Licensed under the Apache License 2.0 (the "License"). You may not use
5		* this file except in compliance with the License. You can obtain a copy
6		* in the file LICENSE in the source distribution or at
7		* https://www.openssl.org/source/license.html
8		*/
9
10		#include "internal/quic_channel.h"
11		#include "internal/quic_cfq.h"
12		#include "internal/numbers.h"
13
14		typedef struct quic_cfq_item_ex_st QUIC_CFQ_ITEM_EX;
15
16		struct quic_cfq_item_ex_st {
17		QUIC_CFQ_ITEM public;
18		QUIC_CFQ_ITEM_EX prev, next;
19		unsigned char *encoded;
20		cfq_free_cb *free_cb;
21		void *free_cb_arg;
22		uint64_t frame_type;
23		size_t encoded_len;
24		uint32_t priority, pn_space, flags;
25		int state;
26		};
27
28		uint64_t ossl_quic_cfq_item_get_frame_type(const QUIC_CFQ_ITEM *item)
29	0	{
30	0	const QUIC_CFQ_ITEM_EX ex = (const QUIC_CFQ_ITEM_EX )item;
31
32	0	return ex->frame_type;
33	0	}
34
35		const unsigned char ossl_quic_cfq_item_get_encoded(const QUIC_CFQ_ITEM item)
36	0	{
37	0	const QUIC_CFQ_ITEM_EX ex = (const QUIC_CFQ_ITEM_EX )item;
38
39	0	return ex->encoded;
40	0	}
41
42		size_t ossl_quic_cfq_item_get_encoded_len(const QUIC_CFQ_ITEM *item)
43	0	{
44	0	const QUIC_CFQ_ITEM_EX ex = (const QUIC_CFQ_ITEM_EX )item;
45
46	0	return ex->encoded_len;
47	0	}
48
49		int ossl_quic_cfq_item_get_state(const QUIC_CFQ_ITEM *item)
50	0	{
51	0	const QUIC_CFQ_ITEM_EX ex = (const QUIC_CFQ_ITEM_EX )item;
52
53	0	return ex->state;
54	0	}
55
56		uint32_t ossl_quic_cfq_item_get_pn_space(const QUIC_CFQ_ITEM *item)
57	0	{
58	0	const QUIC_CFQ_ITEM_EX ex = (const QUIC_CFQ_ITEM_EX )item;
59
60	0	return ex->pn_space;
61	0	}
62
63		int ossl_quic_cfq_item_is_unreliable(const QUIC_CFQ_ITEM *item)
64	0	{
65	0	const QUIC_CFQ_ITEM_EX ex = (const QUIC_CFQ_ITEM_EX )item;
66
67	0	return (ex->flags & QUIC_CFQ_ITEM_FLAG_UNRELIABLE) != 0;
68	0	}
69
70		typedef struct quic_cfq_item_list_st {
71		QUIC_CFQ_ITEM_EX head, tail;
72		} QUIC_CFQ_ITEM_LIST;
73
74		struct quic_cfq_st {
75		/*
76		* Invariant: A CFQ item is always in exactly one of these lists, never more
77		* or less than one.
78		*
79		* Invariant: The list the CFQ item is determined exactly by the state field
80		* of the item.
81		*/
82		QUIC_CFQ_ITEM_LIST new_list, tx_list, free_list;
83		};
84
85		static int compare(const QUIC_CFQ_ITEM_EX a, const QUIC_CFQ_ITEM_EX b)
86	0	{
87	0	if (a->pn_space < b->pn_space)
88	0	return -1;
89	0	else if (a->pn_space > b->pn_space)
90	0	return 1;
91
92	0	if (a->priority > b->priority)
93	0	return -1;
94	0	else if (a->priority < b->priority)
95	0	return 1;
96
97	0	return 0;
98	0	}
99
100		static void list_remove(QUIC_CFQ_ITEM_LIST l, QUIC_CFQ_ITEM_EX n)
101	0	{
102	0	if (l->head == n)
103	0	l->head = n->next;
104	0	if (l->tail == n)
105	0	l->tail = n->prev;
106	0	if (n->prev != NULL)
107	0	n->prev->next = n->next;
108	0	if (n->next != NULL)
109	0	n->next->prev = n->prev;
110	0	n->prev = n->next = NULL;
111	0	}
112
113		static void list_insert_head(QUIC_CFQ_ITEM_LIST l, QUIC_CFQ_ITEM_EX n)
114	0	{
115	0	n->next = l->head;
116	0	n->prev = NULL;
117	0	l->head = n;
118	0	if (n->next != NULL)
119	0	n->next->prev = n;
120	0	if (l->tail == NULL)
121	0	l->tail = n;
122	0	}
123
124		static void list_insert_tail(QUIC_CFQ_ITEM_LIST l, QUIC_CFQ_ITEM_EX n)
125	0	{
126	0	n->prev = l->tail;
127	0	n->next = NULL;
128	0	l->tail = n;
129	0	if (n->prev != NULL)
130	0	n->prev->next = n;
131	0	if (l->head == NULL)
132	0	l->head = n;
133	0	}
134
135		static void list_insert_after(QUIC_CFQ_ITEM_LIST *l,
136		QUIC_CFQ_ITEM_EX *ref,
137		QUIC_CFQ_ITEM_EX *n)
138	0	{
139	0	n->prev = ref;
140	0	n->next = ref->next;
141	0	if (ref->next != NULL)
142	0	ref->next->prev = n;
143	0	ref->next = n;
144	0	if (l->tail == ref)
145	0	l->tail = n;
146	0	}
147
148		static void list_insert_sorted(QUIC_CFQ_ITEM_LIST l, QUIC_CFQ_ITEM_EX n,
149		int (cmp)(const QUIC_CFQ_ITEM_EX a,
150		const QUIC_CFQ_ITEM_EX *b))
151	0	{
152	0	QUIC_CFQ_ITEM_EX p = l->head, pprev = NULL;
153
154	0	if (p == NULL) {
155	0	l->head = l->tail = n;
156	0	n->prev = n->next = NULL;
157	0	return;
158	0	}
159
160	0	for (; p != NULL && cmp(p, n) < 0; pprev = p, p = p->next)
161	0	;
162
163	0	if (p == NULL)
164	0	list_insert_tail(l, n);
165	0	else if (pprev == NULL)
166	0	list_insert_head(l, n);
167	0	else
168	0	list_insert_after(l, pprev, n);
169	0	}
170
171		QUIC_CFQ *ossl_quic_cfq_new(void)
172	0	{
173	0	QUIC_CFQ cfq = OPENSSL_zalloc(sizeof(cfq));
174
175	0	if (cfq == NULL)
176	0	return NULL;
177
178	0	return cfq;
179	0	}
180
181		static void clear_item(QUIC_CFQ_ITEM_EX *item)
182	0	{
183	0	if (item->free_cb != NULL) {
184	0	item->free_cb(item->encoded, item->encoded_len, item->free_cb_arg);
185
186	0	item->free_cb = NULL;
187	0	item->encoded = NULL;
188	0	item->encoded_len = 0;
189	0	}
190
191	0	item->state = -1;
192	0	}
193
194		static void free_list_items(QUIC_CFQ_ITEM_LIST *l)
195	0	{
196	0	QUIC_CFQ_ITEM_EX p, pnext;
197
198	0	for (p = l->head; p != NULL; p = pnext) {
199	0	pnext = p->next;
200	0	clear_item(p);
201	0	OPENSSL_free(p);
202	0	}
203	0	}
204
205		void ossl_quic_cfq_free(QUIC_CFQ *cfq)
206	0	{
207	0	if (cfq == NULL)
208	0	return;
209
210	0	free_list_items(&cfq->new_list);
211	0	free_list_items(&cfq->tx_list);
212	0	free_list_items(&cfq->free_list);
213	0	OPENSSL_free(cfq);
214	0	}
215
216		static QUIC_CFQ_ITEM_EX cfq_get_free(QUIC_CFQ cfq)
217	0	{
218	0	QUIC_CFQ_ITEM_EX *item = cfq->free_list.head;
219
220	0	if (item != NULL)
221	0	return item;
222
223	0	item = OPENSSL_zalloc(sizeof(*item));
224	0	if (item == NULL)
225	0	return NULL;
226
227	0	item->state = -1;
228	0	list_insert_tail(&cfq->free_list, item);
229	0	return item;
230	0	}
231
232		QUIC_CFQ_ITEM ossl_quic_cfq_add_frame(QUIC_CFQ cfq,
233		uint32_t priority,
234		uint32_t pn_space,
235		uint64_t frame_type,
236		uint32_t flags,
237		const unsigned char *encoded,
238		size_t encoded_len,
239		cfq_free_cb *free_cb,
240		void *free_cb_arg)
241	0	{
242	0	QUIC_CFQ_ITEM_EX *item = cfq_get_free(cfq);
243
244	0	if (item == NULL)
245	0	return NULL;
246
247	0	item->priority = priority;
248	0	item->frame_type = frame_type;
249	0	item->pn_space = pn_space;
250	0	item->encoded = (unsigned char *)encoded;
251	0	item->encoded_len = encoded_len;
252	0	item->free_cb = free_cb;
253	0	item->free_cb_arg = free_cb_arg;
254
255	0	item->state = QUIC_CFQ_STATE_NEW;
256	0	item->flags = flags;
257	0	list_remove(&cfq->free_list, item);
258	0	list_insert_sorted(&cfq->new_list, item, compare);
259	0	return &item->public;
260	0	}
261
262		void ossl_quic_cfq_mark_tx(QUIC_CFQ cfq, QUIC_CFQ_ITEM item)
263	0	{
264	0	QUIC_CFQ_ITEM_EX ex = (QUIC_CFQ_ITEM_EX )item;
265
266	0	switch (ex->state) {
267	0	case QUIC_CFQ_STATE_NEW:
268	0	list_remove(&cfq->new_list, ex);
269	0	list_insert_tail(&cfq->tx_list, ex);
270	0	ex->state = QUIC_CFQ_STATE_TX;
271	0	break;
272	0	case QUIC_CFQ_STATE_TX:
273	0	break; /* nothing to do */
274	0	default:
275	0	assert(0); /* invalid state (e.g. in free state) */
276	0	break;
277	0	}
278	0	}
279
280		void ossl_quic_cfq_mark_lost(QUIC_CFQ cfq, QUIC_CFQ_ITEM item,
281		uint32_t priority)
282	0	{
283	0	QUIC_CFQ_ITEM_EX ex = (QUIC_CFQ_ITEM_EX )item;
284
285	0	if (ossl_quic_cfq_item_is_unreliable(item)) {
286	0	ossl_quic_cfq_release(cfq, item);
287	0	return;
288	0	}
289
290	0	switch (ex->state) {
291	0	case QUIC_CFQ_STATE_NEW:
292	0	if (priority != UINT32_MAX && priority != ex->priority) {
293	0	list_remove(&cfq->new_list, ex);
294	0	ex->priority = priority;
295	0	list_insert_sorted(&cfq->new_list, ex, compare);
296	0	}
297	0	break; /* nothing to do */
298	0	case QUIC_CFQ_STATE_TX:
299	0	if (priority != UINT32_MAX)
300	0	ex->priority = priority;
301	0	list_remove(&cfq->tx_list, ex);
302	0	list_insert_sorted(&cfq->new_list, ex, compare);
303	0	ex->state = QUIC_CFQ_STATE_NEW;
304	0	break;
305	0	default:
306	0	assert(0); /* invalid state (e.g. in free state) */
307	0	break;
308	0	}
309	0	}
310
311		int ossl_quic_cfq_discard_unreliable(QUIC_CFQ cfq, QUIC_CFQ_ITEM item)
312	0	{
313	0	int discarded;
314
315	0	if (ossl_quic_cfq_item_is_unreliable(item)) {
316	0	ossl_quic_cfq_release(cfq, item);
317	0	discarded = 1;
318	0	} else {
319	0	discarded = 0;
320	0	}
321
322	0	return discarded;
323	0	}
324
325		/*
326		* Releases a CFQ item. The item may be in either state (NEW or TX) prior to the
327		* call. The QUIC_CFQ_ITEM pointer must not be used following this call.
328		*/
329		void ossl_quic_cfq_release(QUIC_CFQ cfq, QUIC_CFQ_ITEM item)
330	0	{
331	0	QUIC_CFQ_ITEM_EX ex = (QUIC_CFQ_ITEM_EX )item;
332
333	0	switch (ex->state) {
334	0	case QUIC_CFQ_STATE_NEW:
335	0	list_remove(&cfq->new_list, ex);
336	0	list_insert_tail(&cfq->free_list, ex);
337	0	clear_item(ex);
338	0	break;
339	0	case QUIC_CFQ_STATE_TX:
340	0	list_remove(&cfq->tx_list, ex);
341	0	list_insert_tail(&cfq->free_list, ex);
342	0	clear_item(ex);
343	0	break;
344	0	default:
345	0	assert(0); /* invalid state (e.g. in free state) */
346	0	break;
347	0	}
348	0	}
349
350		QUIC_CFQ_ITEM ossl_quic_cfq_get_priority_head(const QUIC_CFQ cfq,
351		uint32_t pn_space)
352	0	{
353	0	QUIC_CFQ_ITEM_EX *item = cfq->new_list.head;
354
355	0	for (; item != NULL && item->pn_space != pn_space; item = item->next)
356	0	;
357
358	0	if (item == NULL)
359	0	return NULL;
360
361	0	return &item->public;
362	0	}
363
364		QUIC_CFQ_ITEM ossl_quic_cfq_item_get_priority_next(const QUIC_CFQ_ITEM item,
365		uint32_t pn_space)
366	0	{
367	0	QUIC_CFQ_ITEM_EX ex = (QUIC_CFQ_ITEM_EX )item;
368
369	0	if (ex == NULL)
370	0	return NULL;
371
372	0	ex = ex->next;
373
374	0	for (; ex != NULL && ex->pn_space != pn_space; ex = ex->next)
375	0	;
376
377	0	if (ex == NULL)
378	0	return NULL; /* ubsan */
379
380	0	return &ex->public;
381	0	}