GCOV - Varnish Cache


/*-
 * Copyright (c) 2016 Varnish Software AS
 * All rights reserved.
 *
 * Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

#include "config.h"

#include <sys/uio.h>

#include "cache/cache_varnishd.h"

#include "cache/cache_transport.h"
#include "http2/cache_http2.h"

#include "vend.h"
#include "vtim.h"

#define H2_SEND_HELD(h2, r2) (VTAILQ_FIRST(&(h2)->txqueue) == (r2))

static h2_error
h2_errcheck(const struct h2_req *r2, const struct h2_sess *h2)
{
        CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);

        if (r2->error != NULL)
                return (r2->error);
        if (h2->error != NULL && r2->stream > h2->goaway_last_stream)
                return (h2->error);
        return (NULL);
}

static int
h2_cond_wait(pthread_cond_t *cond, struct h2_sess *h2, struct h2_req *r2)
{
        vtim_dur tmo = 0.;
        vtim_real now;
        h2_error h2e;
        int r;

        AN(cond);
        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
        CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);

        Lck_AssertHeld(&h2->sess->mtx);

        if (cache_param->h2_window_timeout > 0.)
                tmo = cache_param->h2_window_timeout;

        r = Lck_CondWaitTimeout(cond, &h2->sess->mtx, tmo);
        assert(r == 0 || r == ETIMEDOUT);

        now = VTIM_real();

        /* NB: when we grab h2_window_timeout before acquiring the session
         * lock we may time out, but once we wake up both send_timeout and
         * h2_window_timeout may have changed meanwhile. For this reason
         * h2_stream_tmo() may not log what timed out and we need to call
         * again with a magic NAN "now" that indicates to h2_stream_tmo()
         * that the stream reached the h2_window_timeout via the lock and
         * force it to log it.
         */
        h2e = h2_stream_tmo(h2, r2, now);
        if (h2e == NULL && r == ETIMEDOUT) {
                h2e = h2_stream_tmo(h2, r2, NAN);
                AN(h2e);
        }

        if (r2->error == NULL)
                r2->error = h2e;

        return (h2e != NULL ? -1 : 0);
}

static void
h2_send_get_locked(struct worker *wrk, struct h2_sess *h2, struct h2_req *r2)
{

        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
        CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);

        Lck_AssertHeld(&h2->sess->mtx);
        if (&wrk->cond == h2->cond)
                ASSERT_RXTHR(h2);
        r2->wrk = wrk;
        VTAILQ_INSERT_TAIL(&h2->txqueue, r2, tx_list);
        while (!H2_SEND_HELD(h2, r2))
                AZ(Lck_CondWait(&wrk->cond, &h2->sess->mtx));
        r2->wrk = NULL;
}

void
H2_Send_Get(struct worker *wrk, struct h2_sess *h2, struct h2_req *r2)
{

        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
        CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);

        Lck_Lock(&h2->sess->mtx);
        h2_send_get_locked(wrk, h2, r2);
        Lck_Unlock(&h2->sess->mtx);
}

static void
h2_send_rel_locked(struct h2_sess *h2, const struct h2_req *r2)
{
        CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);

        Lck_AssertHeld(&h2->sess->mtx);
        AN(H2_SEND_HELD(h2, r2));
        VTAILQ_REMOVE(&h2->txqueue, r2, tx_list);
        r2 = VTAILQ_FIRST(&h2->txqueue);
        if (r2 != NULL) {
                CHECK_OBJ_NOTNULL(r2->wrk, WORKER_MAGIC);
                PTOK(pthread_cond_signal(&r2->wrk->cond));
        }
}

void
H2_Send_Rel(struct h2_sess *h2, const struct h2_req *r2)
{
        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
        CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);

        Lck_Lock(&h2->sess->mtx);
        h2_send_rel_locked(h2, r2);
        Lck_Unlock(&h2->sess->mtx);
}

static void
h2_mk_hdr(uint8_t *hdr, h2_frame ftyp, uint8_t flags,
    uint32_t len, uint32_t stream)
{

        AN(hdr);
        assert(len < (1U << 24));
        vbe32enc(hdr, len << 8);
        hdr[3] = ftyp->type;
        hdr[4] = flags;
        vbe32enc(hdr + 5, stream);
}

/*
 * This is the "raw" frame sender, all per-stream accounting and
 * prioritization must have happened before this is called, and
 * the session mtx must be held.
 */

void
H2_Send_Frame(struct worker *wrk, struct h2_sess *h2,
    h2_frame ftyp, uint8_t flags,
    uint32_t len, uint32_t stream, const void *ptr)
{
        uint8_t hdr[9];
        ssize_t s;
        struct iovec iov[2];

        (void)wrk;

        AN(ftyp);
        AZ(flags & ~(ftyp->flags));
        if (stream == 0)
                AZ(ftyp->act_szero);
        else
                AZ(ftyp->act_snonzero);

        h2_mk_hdr(hdr, ftyp, flags, len, stream);
        Lck_Lock(&h2->sess->mtx);
        VSLb_bin(h2->vsl, SLT_H2TxHdr, 9, hdr);
        h2->srq->acct.resp_hdrbytes += 9;
        if (ftyp->overhead)
                h2->srq->acct.resp_bodybytes += len;
        Lck_Unlock(&h2->sess->mtx);

        memset(iov, 0, sizeof iov);
        iov[0].iov_base = (void*)hdr;
        iov[0].iov_len = sizeof hdr;
        iov[1].iov_base = TRUST_ME(ptr);
        iov[1].iov_len = len;
        s = writev(h2->sess->fd, iov, len == 0 ? 1 : 2);
        if (s != sizeof hdr + len) {
                if (errno == EWOULDBLOCK) {
                        H2S_Lock_VSLb(h2, SLT_SessError,
                             "H2: stream %u: Hit idle_send_timeout", stream);
                }
                else {
                        H2S_Lock_VSLb(h2, SLT_Debug,
                            "H2: stream %u: write error s=%zd/%zu errno=%d",
                            stream, s, sizeof hdr + len, errno);
                }
                /*
                 * There is no point in being nice here, we will be unable
                 * to send a GOAWAY once the code unrolls, so go directly
                 * to the finale and be done with it.
                 */
                h2->error = H2CE_PROTOCOL_ERROR;
        } else if (len > 0) {
                Lck_Lock(&h2->sess->mtx);
                VSLb_bin(h2->vsl, SLT_H2TxBody, len, ptr);
                Lck_Unlock(&h2->sess->mtx);
        }
}

static int64_t
h2_win_limit(const struct h2_req *r2, const struct h2_sess *h2)
{

        CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
        CHECK_OBJ_NOTNULL(h2->req0, H2_REQ_MAGIC);

        Lck_AssertHeld(&h2->sess->mtx);
        return (vmin_t(int64_t, r2->t_window, h2->req0->t_window));
}

static void
h2_win_charge(struct h2_req *r2, const struct h2_sess *h2, uint32_t w)
{
        CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
        CHECK_OBJ_NOTNULL(h2->req0, H2_REQ_MAGIC);

        Lck_AssertHeld(&h2->sess->mtx);
        r2->t_window -= w;
        h2->req0->t_window -= w;
}

static int64_t
h2_do_window(struct worker *wrk, struct h2_req *r2,
    struct h2_sess *h2, int64_t wanted)
{
        int64_t w = 0;

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
        CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);

        if (wanted == 0)
                return (0);

        Lck_Lock(&h2->sess->mtx);
        if (r2->t_window <= 0 || h2->req0->t_window <= 0) {
                r2->t_winupd = VTIM_real();
                h2_send_rel_locked(h2, r2);

                assert(h2->winup_streams >= 0);
                h2->winup_streams++;

                while (r2->t_window <= 0 && h2_errcheck(r2, h2) == NULL) {
                        r2->cond = &wrk->cond;
                        (void)h2_cond_wait(r2->cond, h2, r2);
                        r2->cond = NULL;
                }

                while (h2->req0->t_window <= 0 && h2_errcheck(r2, h2) == NULL)
                        (void)h2_cond_wait(h2->winupd_cond, h2, r2);

                if (h2_errcheck(r2, h2) == NULL) {
                        w = vmin_t(int64_t, h2_win_limit(r2, h2), wanted);
                        h2_win_charge(r2, h2, w);
                        assert (w > 0);
                }

                if (r2->error == H2SE_BROKE_WINDOW &&
                    h2->open_streams <= h2->winup_streams) {
                        VSLb(h2->vsl, SLT_SessError, "H2: window bankrupt");
                        h2->error = r2->error = H2CE_BANKRUPT;
                    }

                assert(h2->winup_streams > 0);
                h2->winup_streams--;

                h2_send_get_locked(wrk, h2, r2);
        }

        if (w == 0 && h2_errcheck(r2, h2) == NULL) {
                assert(r2->t_window > 0);
                assert(h2->req0->t_window > 0);
                w = h2_win_limit(r2, h2);
                if (w > wanted)
                        w = wanted;
                h2_win_charge(r2, h2, w);
                assert (w > 0);
        }
        r2->t_winupd = 0;
        Lck_Unlock(&h2->sess->mtx);
        return (w);
}

/*
 * This is the per-stream frame sender.
 * XXX: priority
 */

static void
h2_send(struct worker *wrk, struct h2_req *r2, h2_frame ftyp, uint8_t flags,
    uint32_t len, const void *ptr, uint64_t *counter)
{
        struct h2_sess *h2;
        uint32_t mfs, tf;
        const char *p;
        uint8_t final_flags;

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
        CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
        h2 = r2->h2sess;
        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
        assert(len == 0 || ptr != NULL);
        AN(counter);

        AN(H2_SEND_HELD(h2, r2));

        if (h2_errcheck(r2, h2) != NULL)
                return;

        AN(ftyp);
        AZ(flags & ~(ftyp->flags));
        if (r2->stream == 0)
                AZ(ftyp->act_szero);
        else
                AZ(ftyp->act_snonzero);

        Lck_Lock(&h2->sess->mtx);
        mfs = h2->remote_settings.max_frame_size;
        if (r2->counted && (
            (ftyp == H2_F_HEADERS && (flags & H2FF_HEADERS_END_STREAM)) ||
            (ftyp == H2_F_DATA && (flags & H2FF_DATA_END_STREAM)) ||
            ftyp == H2_F_RST_STREAM
            )) {
                assert(h2->open_streams > 0);
                h2->open_streams--;
                r2->counted = 0;
        }
        Lck_Unlock(&h2->sess->mtx);

        if (ftyp->respect_window) {
                tf = h2_do_window(wrk, r2, h2, (len > mfs) ? mfs : len);
                if (h2_errcheck(r2, h2) != NULL)
                        return;
                AN(H2_SEND_HELD(h2, r2));
        } else
                tf = mfs;

        if (len <= tf) {
                H2_Send_Frame(wrk, h2, ftyp, flags, len, r2->stream, ptr);
                *counter += len;
        } else {
                AN(ptr);
                p = ptr;
                final_flags = ftyp->final_flags & flags;
                flags &= ~ftyp->final_flags;
                do {
                        AN(ftyp->continuation);
                        if (!ftyp->respect_window)
                                tf = mfs;
                        if (ftyp->respect_window && p != ptr) {
                                tf = h2_do_window(wrk, r2, h2,
                                    (len > mfs) ? mfs : len);
                                if (h2_errcheck(r2, h2) != NULL)
                                        return;
                                AN(H2_SEND_HELD(h2, r2));
                        }
                        if (tf < len) {
                                H2_Send_Frame(wrk, h2, ftyp,
                                    flags, tf, r2->stream, p);
                        } else {
                                if (ftyp->respect_window)
                                        assert(tf == len);
                                tf = len;
                                H2_Send_Frame(wrk, h2, ftyp, final_flags, tf,
                                    r2->stream, p);
                                flags = 0;
                        }
                        p += tf;
                        len -= tf;
                        *counter += tf;
                        ftyp = ftyp->continuation;
                        flags &= ftyp->flags;
                        final_flags &= ftyp->flags;
                } while (h2->error == NULL && len > 0);
        }
}

void
H2_Send_RST(struct worker *wrk, struct h2_sess *h2, const struct h2_req *r2,
    uint32_t stream, h2_error h2e)
{
        char b[4];

        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
        CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
        AN(H2_SEND_HELD(h2, r2));
        AN(h2e);

        H2S_Lock_VSLb(h2, SLT_Debug, "H2: stream %u: %s", stream, h2e->txt);
        vbe32enc(b, h2e->val);

        H2_Send_Frame(wrk, h2, H2_F_RST_STREAM, 0, sizeof b, stream, b);
}

void
H2_Send(struct worker *wrk, struct h2_req *r2, h2_frame ftyp, uint8_t flags,
    uint32_t len, const void *ptr, uint64_t *counter)
{
        uint64_t dummy_counter = 0;
        h2_error h2e;

        if (counter == NULL)
                counter = &dummy_counter;

        h2_send(wrk, r2, ftyp, flags, len, ptr, counter);

        h2e = h2_errcheck(r2, r2->h2sess);
        if (H2_ERROR_MATCH(h2e, H2SE_CANCEL))
                H2_Send_RST(wrk, r2->h2sess, r2, r2->stream, h2e);
}

		varnish-cache/bin/varnishd/http2/cache_http2_send.c
0		/*-
1		* Copyright (c) 2016 Varnish Software AS
2		* All rights reserved.
3		*
4		* Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
5		*
6		* SPDX-License-Identifier: BSD-2-Clause
7		*
8		* Redistribution and use in source and binary forms, with or without
9		* modification, are permitted provided that the following conditions
10		* are met:
11		* 1. Redistributions of source code must retain the above copyright
12		* notice, this list of conditions and the following disclaimer.
13		* 2. Redistributions in binary form must reproduce the above copyright
14		* notice, this list of conditions and the following disclaimer in the
15		* documentation and/or other materials provided with the distribution.
16		*
17		* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18		* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19		* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20		* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
21		* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22		* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23		* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24		* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25		* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26		* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27		* SUCH DAMAGE.
28		*
29		*/
30
31		#include "config.h"
32
33		#include <sys/uio.h>
34
35		#include "cache/cache_varnishd.h"
36
37		#include "cache/cache_transport.h"
38		#include "http2/cache_http2.h"
39
40		#include "vend.h"
41		#include "vtim.h"
42
43		#define H2_SEND_HELD(h2, r2) (VTAILQ_FIRST(&(h2)->txqueue) == (r2))
44
45		static h2_error
46	1665	h2_errcheck(const struct h2_req r2, const struct h2_sess h2)
47		{
48	1665	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
49	1665	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
50
51	1665	if (r2->error != NULL)
52	241	return (r2->error);
53	1424	if (h2->error != NULL && r2->stream > h2->goaway_last_stream)
54	5	return (h2->error);
55	1419	return (NULL);
56	1665	}
57
58		static int
59	42	h2_cond_wait(pthread_cond_t cond, struct h2_sess h2, struct h2_req *r2)
60		{
61	42	vtim_dur tmo = 0.;
62		vtim_real now;
63		h2_error h2e;
64		int r;
65
66	42	AN(cond);
67	42	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
68	42	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
69
70	42	Lck_AssertHeld(&h2->sess->mtx);
71
72	42	if (cache_param->h2_window_timeout > 0.)
73	42	tmo = cache_param->h2_window_timeout;
74
75	42	r = Lck_CondWaitTimeout(cond, &h2->sess->mtx, tmo);
76	42	assert(r == 0 \|\| r == ETIMEDOUT);
77
78	42	now = VTIM_real();
79
80		/* NB: when we grab h2_window_timeout before acquiring the session
81		* lock we may time out, but once we wake up both send_timeout and
82		* h2_window_timeout may have changed meanwhile. For this reason
83		* h2_stream_tmo() may not log what timed out and we need to call
84		* again with a magic NAN "now" that indicates to h2_stream_tmo()
85		* that the stream reached the h2_window_timeout via the lock and
86		* force it to log it.
87		*/
88	42	h2e = h2_stream_tmo(h2, r2, now);
89	42	if (h2e == NULL && r == ETIMEDOUT) {
90	3	h2e = h2_stream_tmo(h2, r2, NAN);
91	3	AN(h2e);
92	3	}
93
94	42	if (r2->error == NULL)
95	39	r2->error = h2e;
96
97	42	return (h2e != NULL ? -1 : 0);
98		}
99
100		static void
101	2308	h2_send_get_locked(struct worker wrk, struct h2_sess h2, struct h2_req *r2)
102		{
103
104	2308	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
105	2308	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
106	2308	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
107
108	2308	Lck_AssertHeld(&h2->sess->mtx);
109	2308	if (&wrk->cond == h2->cond)
110	1167	ASSERT_RXTHR(h2);
111	2308	r2->wrk = wrk;
112	2308	VTAILQ_INSERT_TAIL(&h2->txqueue, r2, tx_list);
113	2334	while (!H2_SEND_HELD(h2, r2))
114	26	AZ(Lck_CondWait(&wrk->cond, &h2->sess->mtx));
115	2308	r2->wrk = NULL;
116	2308	}
117
118		void
119	2275	H2_Send_Get(struct worker wrk, struct h2_sess h2, struct h2_req *r2)
120		{
121
122	2275	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
123	2275	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
124	2275	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
125
126	2275	Lck_Lock(&h2->sess->mtx);
127	2275	h2_send_get_locked(wrk, h2, r2);
128	2275	Lck_Unlock(&h2->sess->mtx);
129	2275	}
130
131		static void
132	2308	h2_send_rel_locked(struct h2_sess h2, const struct h2_req r2)
133		{
134	2308	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
135	2308	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
136
137	2308	Lck_AssertHeld(&h2->sess->mtx);
138	2308	AN(H2_SEND_HELD(h2, r2));
139	2308	VTAILQ_REMOVE(&h2->txqueue, r2, tx_list);
140	2308	r2 = VTAILQ_FIRST(&h2->txqueue);
141	2308	if (r2 != NULL) {
142	26	CHECK_OBJ_NOTNULL(r2->wrk, WORKER_MAGIC);
143	26	PTOK(pthread_cond_signal(&r2->wrk->cond));
144	26	}
145	2308	}
146
147		void
148	2275	H2_Send_Rel(struct h2_sess h2, const struct h2_req r2)
149		{
150	2275	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
151	2275	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
152
153	2275	Lck_Lock(&h2->sess->mtx);
154	2275	h2_send_rel_locked(h2, r2);
155	2275	Lck_Unlock(&h2->sess->mtx);
156	2275	}
157
158		static void
159	2257	h2_mk_hdr(uint8_t *hdr, h2_frame ftyp, uint8_t flags,
160		uint32_t len, uint32_t stream)
161		{
162
163	2257	AN(hdr);
164	2257	assert(len < (1U << 24));
165	2257	vbe32enc(hdr, len << 8);
166	2257	hdr[3] = ftyp->type;
167	2257	hdr[4] = flags;
168	2257	vbe32enc(hdr + 5, stream);
169	2257	}
170
171		/*
172		* This is the "raw" frame sender, all per-stream accounting and
173		* prioritization must have happened before this is called, and
174		* the session mtx must be held.
175		*/
176
177		void
178	2257	H2_Send_Frame(struct worker wrk, struct h2_sess h2,
179		h2_frame ftyp, uint8_t flags,
180		uint32_t len, uint32_t stream, const void *ptr)
181		{
182		uint8_t hdr[9];
183		ssize_t s;
184		struct iovec iov[2];
185
186	2257	(void)wrk;
187
188	2257	AN(ftyp);
189	2257	AZ(flags & ~(ftyp->flags));
190	2257	if (stream == 0)
191	1461	AZ(ftyp->act_szero);
192		else
193	796	AZ(ftyp->act_snonzero);
194
195	2257	h2_mk_hdr(hdr, ftyp, flags, len, stream);
196	2257	Lck_Lock(&h2->sess->mtx);
197	2257	VSLb_bin(h2->vsl, SLT_H2TxHdr, 9, hdr);
198	2257	h2->srq->acct.resp_hdrbytes += 9;
199	2257	if (ftyp->overhead)
200	1693	h2->srq->acct.resp_bodybytes += len;
201	2257	Lck_Unlock(&h2->sess->mtx);
202
203	2257	memset(iov, 0, sizeof iov);
204	2257	iov[0].iov_base = (void*)hdr;
205	2257	iov[0].iov_len = sizeof hdr;
206	2257	iov[1].iov_base = TRUST_ME(ptr);
207	2257	iov[1].iov_len = len;
208	2257	s = writev(h2->sess->fd, iov, len == 0 ? 1 : 2);
209	2257	if (s != sizeof hdr + len) {
210	9	if (errno == EWOULDBLOCK) {
211	0	H2S_Lock_VSLb(h2, SLT_SessError,
212	0	"H2: stream %u: Hit idle_send_timeout", stream);
213	0	}
214		else {
215	18	H2S_Lock_VSLb(h2, SLT_Debug,
216		"H2: stream %u: write error s=%zd/%zu errno=%d",
217	9	stream, s, sizeof hdr + len, errno);
218		}
219		/*
220		* There is no point in being nice here, we will be unable
221		* to send a GOAWAY once the code unrolls, so go directly
222		* to the finale and be done with it.
223		*/
224	9	h2->error = H2CE_PROTOCOL_ERROR;
225	2257	} else if (len > 0) {
226	1726	Lck_Lock(&h2->sess->mtx);
227	1726	VSLb_bin(h2->vsl, SLT_H2TxBody, len, ptr);
228	1726	Lck_Unlock(&h2->sess->mtx);
229	1726	}
230	2257	}
231
232		static int64_t
233	150	h2_win_limit(const struct h2_req r2, const struct h2_sess h2)
234		{
235
236	150	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
237	150	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
238	150	CHECK_OBJ_NOTNULL(h2->req0, H2_REQ_MAGIC);
239
240	150	Lck_AssertHeld(&h2->sess->mtx);
241	150	return (vmin_t(int64_t, r2->t_window, h2->req0->t_window));
242		}
243
244		static void
245	150	h2_win_charge(struct h2_req r2, const struct h2_sess h2, uint32_t w)
246		{
247	150	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
248	150	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
249	150	CHECK_OBJ_NOTNULL(h2->req0, H2_REQ_MAGIC);
250
251	150	Lck_AssertHeld(&h2->sess->mtx);
252	150	r2->t_window -= w;
253	150	h2->req0->t_window -= w;
254	150	}
255
256		static int64_t
257	246	h2_do_window(struct worker wrk, struct h2_req r2,
258		struct h2_sess *h2, int64_t wanted)
259		{
260	246	int64_t w = 0;
261
262	246	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
263	246	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
264	246	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
265
266	246	if (wanted == 0)
267	84	return (0);
268
269	162	Lck_Lock(&h2->sess->mtx);
270	162	if (r2->t_window <= 0 \|\| h2->req0->t_window <= 0) {
271	33	r2->t_winupd = VTIM_real();
272	33	h2_send_rel_locked(h2, r2);
273
274	33	assert(h2->winup_streams >= 0);
275	33	h2->winup_streams++;
276
277	66	while (r2->t_window <= 0 && h2_errcheck(r2, h2) == NULL) {
278	33	r2->cond = &wrk->cond;
279	33	(void)h2_cond_wait(r2->cond, h2, r2);
280	33	r2->cond = NULL;
281		}
282
283	42	while (h2->req0->t_window <= 0 && h2_errcheck(r2, h2) == NULL)
284	9	(void)h2_cond_wait(h2->winupd_cond, h2, r2);
285
286	33	if (h2_errcheck(r2, h2) == NULL) {
287	21	w = vmin_t(int64_t, h2_win_limit(r2, h2), wanted);
288	21	h2_win_charge(r2, h2, w);
289	21	assert (w > 0);
290	21	}
291
292	33	if (r2->error == H2SE_BROKE_WINDOW &&
293	6	h2->open_streams <= h2->winup_streams) {
294	0	VSLb(h2->vsl, SLT_SessError, "H2: window bankrupt");
295	0	h2->error = r2->error = H2CE_BANKRUPT;
296	0	}
297
298	33	assert(h2->winup_streams > 0);
299	33	h2->winup_streams--;
300
301	33	h2_send_get_locked(wrk, h2, r2);
302	33	}
303
304	162	if (w == 0 && h2_errcheck(r2, h2) == NULL) {
305	129	assert(r2->t_window > 0);
306	129	assert(h2->req0->t_window > 0);
307	129	w = h2_win_limit(r2, h2);
308	129	if (w > wanted)
309	108	w = wanted;
310	129	h2_win_charge(r2, h2, w);
311	129	assert (w > 0);
312	129	}
313	162	r2->t_winupd = 0;
314	162	Lck_Unlock(&h2->sess->mtx);
315	162	return (w);
316	246	}
317
318		/*
319		* This is the per-stream frame sender.
320		* XXX: priority
321		*/
322
323		static void
324	597	h2_send(struct worker wrk, struct h2_req r2, h2_frame ftyp, uint8_t flags,
325		uint32_t len, const void ptr, uint64_t counter)
326		{
327		struct h2_sess *h2;
328		uint32_t mfs, tf;
329		const char *p;
330		uint8_t final_flags;
331
332	597	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
333	597	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
334	597	h2 = r2->h2sess;
335	597	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
336	597	assert(len == 0 \|\| ptr != NULL);
337	597	AN(counter);
338
339	597	AN(H2_SEND_HELD(h2, r2));
340
341	597	if (h2_errcheck(r2, h2) != NULL)
342	93	return;
343
344	504	AN(ftyp);
345	504	AZ(flags & ~(ftyp->flags));
346	504	if (r2->stream == 0)
347	0	AZ(ftyp->act_szero);
348		else
349	504	AZ(ftyp->act_snonzero);
350
351	504	Lck_Lock(&h2->sess->mtx);
352	504	mfs = h2->remote_settings.max_frame_size;
353	504	if (r2->counted && (
354	504	(ftyp == H2_F_HEADERS && (flags & H2FF_HEADERS_END_STREAM)) \|\|
355	192	(ftyp == H2_F_DATA && (flags & H2FF_DATA_END_STREAM)) \|\|
356	0	ftyp == H2_F_RST_STREAM
357		)) {
358	723	assert(h2->open_streams > 0);
359	285	h2->open_streams--;
360	285	r2->counted = 0;
361	285	}
362	504	Lck_Unlock(&h2->sess->mtx);
363
364	504	if (ftyp->respect_window) {
365	192	tf = h2_do_window(wrk, r2, h2, (len > mfs) ? mfs : len);
366	192	if (h2_errcheck(r2, h2) != NULL)
367	0	return;
368	192	AN(H2_SEND_HELD(h2, r2));
369	192	} else
370	312	tf = mfs;
371
372	504	if (len <= tf) {
373	474	H2_Send_Frame(wrk, h2, ftyp, flags, len, r2->stream, ptr);
374	474	*counter += len;
375	474	} else {
376	30	AN(ptr);
377	30	p = ptr;
378	30	final_flags = ftyp->final_flags & flags;
379	30	flags &= ~ftyp->final_flags;
380	30	do {
381	102	AN(ftyp->continuation);
382	102	if (!ftyp->respect_window)
383	24	tf = mfs;
384	102	if (ftyp->respect_window && p != ptr) {
385	108	tf = h2_do_window(wrk, r2, h2,
386	54	(len > mfs) ? mfs : len);
387	54	if (h2_errcheck(r2, h2) != NULL)
388	12	return;
389	42	AN(H2_SEND_HELD(h2, r2));
390	42	}
391	90	if (tf < len) {
392	144	H2_Send_Frame(wrk, h2, ftyp,
393	72	flags, tf, r2->stream, p);
394	72	} else {
395	18	if (ftyp->respect_window)
396	12	assert(tf == len);
397	18	tf = len;
398	36	H2_Send_Frame(wrk, h2, ftyp, final_flags, tf,
399	18	r2->stream, p);
400	18	flags = 0;
401		}
402	90	p += tf;
403	90	len -= tf;
404	90	*counter += tf;
405	90	ftyp = ftyp->continuation;
406	90	flags &= ftyp->flags;
407	90	final_flags &= ftyp->flags;
408	90	} while (h2->error == NULL && len > 0);
409		}
410	597	}
411
412		void
413	172	H2_Send_RST(struct worker wrk, struct h2_sess h2, const struct h2_req *r2,
414		uint32_t stream, h2_error h2e)
415		{
416		char b[4];
417
418	172	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
419	172	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
420	172	AN(H2_SEND_HELD(h2, r2));
421	172	AN(h2e);
422
423	172	H2S_Lock_VSLb(h2, SLT_Debug, "H2: stream %u: %s", stream, h2e->txt);
424	172	vbe32enc(b, h2e->val);
425
426	172	H2_Send_Frame(wrk, h2, H2_F_RST_STREAM, 0, sizeof b, stream, b);
427	172	}
428
429		void
430	597	H2_Send(struct worker wrk, struct h2_req r2, h2_frame ftyp, uint8_t flags,
431		uint32_t len, const void ptr, uint64_t counter)
432		{
433	597	uint64_t dummy_counter = 0;
434		h2_error h2e;
435
436	597	if (counter == NULL)
437	162	counter = &dummy_counter;
438
439	597	h2_send(wrk, r2, ftyp, flags, len, ptr, counter);
440
441	597	h2e = h2_errcheck(r2, r2->h2sess);
442	597	if (H2_ERROR_MATCH(h2e, H2SE_CANCEL))
443	15	H2_Send_RST(wrk, r2->h2sess, r2, r2->stream, h2e);
444	597	}